X-Git-Url: https://scripts.mit.edu/gitweb/autoinstalls/wordpress.git/blobdiff_plain/7688c6ba71852cd89123b62b2d57683535e4702a..refs/tags/wordpress-2.8-scripts:/wp-includes/query.php?ds=sidebyside

diff --git a/wp-includes/query.php b/wp-includes/query.php
index 564c47b8..663133ff 100644
--- a/wp-includes/query.php
+++ b/wp-includes/query.php
@@ -1,54 +1,155 @@
 <?php
-
-/*
- * The Big Query.
+/**
+ * WordPress Query API
+ *
+ * The query API attempts to get which part of WordPress to the user is on. It
+ * also provides functionality to getting URL query information.
+ *
+ * @link http://codex.wordpress.org/The_Loop More information on The Loop.
+ *
+ * @package WordPress
+ * @subpackage Query
  */
 
+/**
+ * Retrieve variable in the WP_Query class.
+ *
+ * @see WP_Query::get()
+ * @since 1.5.0
+ * @uses $wp_query
+ *
+ * @param string $var The variable key to retrieve.
+ * @return mixed
+ */
 function get_query_var($var) {
 	global $wp_query;
 
 	return $wp_query->get($var);
 }
 
+/**
+ * Set query variable.
+ *
+ * @see WP_Query::set()
+ * @since 2.2.0
+ * @uses $wp_query
+ *
+ * @param string $var Query variable key.
+ * @param mixed $value
+ * @return null
+ */
 function set_query_var($var, $value) {
 	global $wp_query;
 
 	return $wp_query->set($var, $value);
 }
 
+/**
+ * Setup The Loop with query parameters.
+ *
+ * This will override the current WordPress Loop and shouldn't be used more than
+ * once. This must not be used within the WordPress Loop.
+ *
+ * @since 1.5.0
+ * @uses $wp_query
+ *
+ * @param string $query
+ * @return array List of posts
+ */
 function &query_posts($query) {
 	unset($GLOBALS['wp_query']);
 	$GLOBALS['wp_query'] =& new WP_Query();
 	return $GLOBALS['wp_query']->query($query);
 }
 
+/**
+ * Destroy the previous query and setup a new query.
+ *
+ * This should be used after {@link query_posts()} and before another {@link
+ * query_posts()}. This will remove obscure bugs that occur when the previous
+ * wp_query object is not destroyed properly before another is setup.
+ *
+ * @since 2.3.0
+ * @uses $wp_query
+ */
 function wp_reset_query() {
 	unset($GLOBALS['wp_query']);
 	$GLOBALS['wp_query'] =& $GLOBALS['wp_the_query'];
+	global $wp_query;
+	if ( !empty($wp_query->post) ) {
+		$GLOBALS['post'] = $wp_query->post;
+		setup_postdata($wp_query->post);
+	}
 }
 
 /*
  * Query type checks.
  */
 
+/**
+ * Whether the current request is in WordPress admin Panel
+ *
+ * Does not inform on whether the user is an admin! Use capability checks to
+ * tell if the user should be accessing a section or not.
+ *
+ * @since 1.5.1
+ *
+ * @return bool True if inside WordPress administration pages.
+ */
 function is_admin () {
-	if ( defined('WP_ADMIN') ) 
+	if ( defined('WP_ADMIN') )
 		return WP_ADMIN;
 	return false;
 }
 
+/**
+ * Is query requesting an archive page.
+ *
+ * @since 1.5.0
+ * @uses $wp_query
+ *
+ * @return bool True if page is archive.
+ */
 function is_archive () {
 	global $wp_query;
 
 	return $wp_query->is_archive;
 }
 
+/**
+ * Is query requesting an attachment page.
+ *
+ * @since 2.0.0
+ * @uses $wp_query
+ *
+ * @return bool True if page is attachment.
+ */
 function is_attachment () {
 	global $wp_query;
 
 	return $wp_query->is_attachment;
 }
 
+/**
+ * Is query requesting an author page.
+ *
+ * If the $author parameter is specified then the check will be expanded to
+ * include whether the queried author matches the one given in the parameter.
+ * You can match against integers and against strings.
+ *
+ * If matching against an integer, the ID should be used of the author for the
+ * test. If the $author is an ID and matches the author page user ID, then
+ * 'true' will be returned.
+ *
+ * If matching against strings, then the test will be matched against both the
+ * nickname and user nicename and will return true on success.
+ *
+ * @since 1.5.0
+ * @uses $wp_query
+ *
+ * @param string|int $author Optional. Is current page this author.
+ * @return bool True if page is author or $author (if set).
+ */
 function is_author ($author = '') {
 	global $wp_query;
 
@@ -60,16 +161,30 @@ function is_author ($author = '') {
 
 	$author_obj = $wp_query->get_queried_object();
 
-	if ( $author == $author_obj->ID )
+	$author = (array) $author;
+
+	if ( in_array( $author_obj->ID, $author ) )
 		return true;
-	elseif ( $author == $author_obj->nickname )
+	elseif ( in_array( $author_obj->nickname, $author ) )
 		return true;
-	elseif ( $author == $author_obj->user_nicename )
+	elseif ( in_array( $author_obj->user_nicename, $author ) )
 		return true;
 
 	return false;
 }
 
+/**
+ * Whether current page query contains a category name or given category name.
+ *
+ * The category list can contain category IDs, names, or category slugs. If any
+ * of them are part of the query, then it will return true.
+ *
+ * @since 1.5.0
+ * @uses $wp_query
+ *
+ * @param string|array $category Optional.
+ * @return bool
+ */
 function is_category ($category = '') {
 	global $wp_query;
 
@@ -81,18 +196,30 @@ function is_category ($category = '') {
 
 	$cat_obj = $wp_query->get_queried_object();
 
-	if ( $category == $cat_obj->term_id )
+	$category = (array) $category;
+
+	if ( in_array( $cat_obj->term_id, $category ) )
 		return true;
-	else if ( $category == $cat_obj->name )
+	elseif ( in_array( $cat_obj->name, $category ) )
 		return true;
-	elseif ( $category == $cat_obj->slug )
+	elseif ( in_array( $cat_obj->slug, $category ) )
 		return true;
 
 	return false;
 }
 
+/**
+ * Whether the current page query has the given tag slug or contains tag.
+ *
+ * @since 2.3.0
+ * @uses $wp_query
+ *
+ * @param string|array $slug Optional. Single tag or list of tags to check for.
+ * @return bool
+ */
 function is_tag( $slug = '' ) {
 	global $wp_query;
+
 	if ( !$wp_query->is_tag )
 		return false;
 
@@ -100,47 +227,163 @@ function is_tag( $slug = '' ) {
 		return true;
 
 	$tag_obj = $wp_query->get_queried_object();
-	if ( $slug == $tag_obj->slug )
+
+	$slug = (array) $slug;
+
+	if ( in_array( $tag_obj->slug, $slug ) )
+		return true;
+
+	return false;
+}
+
+/**
+ * Whether the current page query has the given taxonomy slug or contains taxonomy.
+ *
+ * @since 2.5.0
+ * @uses $wp_query
+ *
+ * @param string|array $slug Optional. Slug or slugs to check in current query.
+ * @return bool
+ */
+function is_tax( $slug = '' ) {
+	global $wp_query;
+
+	if ( !$wp_query->is_tax )
+		return false;
+
+	if ( empty($slug) )
 		return true;
+
+	$term = $wp_query->get_queried_object();
+
+	$slug = (array) $slug;
+
+	if ( in_array( $term->slug, $slug ) )
+		return true;
+
 	return false;
 }
 
+/**
+ * Whether the current URL is within the comments popup window.
+ *
+ * @since 1.5.0
+ * @uses $wp_query
+ *
+ * @return bool
+ */
 function is_comments_popup () {
 	global $wp_query;
 
 	return $wp_query->is_comments_popup;
 }
 
+/**
+ * Whether current URL is based on a date.
+ *
+ * @since 1.5.0
+ * @uses $wp_query
+ *
+ * @return bool
+ */
 function is_date () {
 	global $wp_query;
 
 	return $wp_query->is_date;
 }
 
+/**
+ * Whether current blog URL contains a day.
+ *
+ * @since 1.5.0
+ * @uses $wp_query
+ *
+ * @return bool
+ */
 function is_day () {
 	global $wp_query;
 
 	return $wp_query->is_day;
 }
 
+/**
+ * Whether current page query is feed URL.
+ *
+ * @since 1.5.0
+ * @uses $wp_query
+ *
+ * @return bool
+ */
 function is_feed () {
 	global $wp_query;
 
 	return $wp_query->is_feed;
 }
 
+/**
+ * Whether current page query is the front of the site.
+ *
+ * @since 2.5.0
+ * @uses is_home()
+ * @uses get_option()
+ *
+ * @return bool True, if front of site.
+ */
+function is_front_page () {
+	// most likely case
+	if ( 'posts' == get_option('show_on_front') && is_home() )
+		return true;
+	elseif ( 'page' == get_option('show_on_front') && get_option('page_on_front') && is_page(get_option('page_on_front')) )
+		return true;
+	else
+		return false;
+}
+
+/**
+ * Whether current page view is the blog homepage.
+ *
+ * @since 1.5.0
+ * @uses $wp_query
+ *
+ * @return bool True if blog view homepage.
+ */
 function is_home () {
 	global $wp_query;
 
 	return $wp_query->is_home;
 }
 
+/**
+ * Whether current page query contains a month.
+ *
+ * @since 1.5.0
+ * @uses $wp_query
+ *
+ * @return bool
+ */
 function is_month () {
 	global $wp_query;
 
 	return $wp_query->is_month;
 }
 
+/**
+ * Whether query is page or contains given page(s).
+ *
+ * Calls the function without any parameters will only test whether the current
+ * query is of the page type. Either a list or a single item can be tested
+ * against for whether the query is a page and also is the value or one of the
+ * values in the page parameter.
+ *
+ * The parameter can contain the page ID, page title, or page name. The
+ * parameter can also be an array of those three values.
+ *
+ * @since 1.5.0
+ * @uses $wp_query
+ *
+ * @param mixed $page Either page or list of pages to test against.
+ * @return bool
+ */
 function is_page ($page = '') {
 	global $wp_query;
 
@@ -152,22 +395,43 @@ function is_page ($page = '') {
 
 	$page_obj = $wp_query->get_queried_object();
 
-	if ( $page == $page_obj->ID )
+	$page = (array) $page;
+
+	if ( in_array( $page_obj->ID, $page ) )
 		return true;
-	elseif ( $page == $page_obj->post_title )
+	elseif ( in_array( $page_obj->post_title, $page ) )
 		return true;
-	else if ( $page == $page_obj->post_name )
+	else if ( in_array( $page_obj->post_name, $page ) )
 		return true;
 
 	return false;
 }
 
+/**
+ * Whether query contains multiple pages for the results.
+ *
+ * @since 1.5.0
+ * @uses $wp_query
+ *
+ * @return bool
+ */
 function is_paged () {
 	global $wp_query;
 
 	return $wp_query->is_paged;
 }
 
+/**
+ * Whether the current page was created by a plugin.
+ *
+ * The plugin can set this by using the global $plugin_page and setting it to
+ * true.
+ *
+ * @since 1.5.0
+ * @global bool $plugin_page Used by plugins to tell the query that current is a plugin page.
+ *
+ * @return bool
+ */
 function is_plugin_page() {
 	global $plugin_page;
 
@@ -177,24 +441,63 @@ function is_plugin_page() {
 	return false;
 }
 
+/**
+ * Whether the current query is preview of post or page.
+ *
+ * @since 2.0.0
+ * @uses $wp_query
+ *
+ * @return bool
+ */
 function is_preview() {
 	global $wp_query;
 
 	return $wp_query->is_preview;
 }
 
+/**
+ * Whether the current query post is robots.
+ *
+ * @since 2.1.0
+ * @uses $wp_query
+ *
+ * @return bool
+ */
 function is_robots() {
 	global $wp_query;
 
 	return $wp_query->is_robots;
 }
 
+/**
+ * Whether current query is the result of a user search.
+ *
+ * @since 1.5.0
+ * @uses $wp_query
+ *
+ * @return bool
+ */
 function is_search () {
 	global $wp_query;
 
 	return $wp_query->is_search;
 }
 
+/**
+ * Whether the current page query is single page.
+ *
+ * The parameter can contain the post ID, post title, or post name. The
+ * parameter can also be an array of those three values.
+ *
+ * This applies to other post types, attachments, pages, posts. Just means that
+ * the current query has only a single object.
+ *
+ * @since 1.5.0
+ * @uses $wp_query
+ *
+ * @param mixed $post Either post or list of posts to test against.
+ * @return bool
+ */
 function is_single ($post = '') {
 	global $wp_query;
 
@@ -206,40 +509,82 @@ function is_single ($post = '') {
 
 	$post_obj = $wp_query->get_queried_object();
 
-	if ( $post == $post_obj->ID )
+	$post = (array) $post;
+
+	if ( in_array( $post_obj->ID, $post ) )
 		return true;
-	elseif ( $post == $post_obj->post_title )
+	elseif ( in_array( $post_obj->post_title, $post ) )
 		return true;
-	elseif ( $post == $post_obj->post_name )
+	elseif ( in_array( $post_obj->post_name, $post ) )
 		return true;
 
 	return false;
 }
 
+/**
+ * Whether is single post, is a page, or is an attachment.
+ *
+ * @since 1.5.0
+ * @uses $wp_query
+ *
+ * @return bool
+ */
 function is_singular() {
 	global $wp_query;
 
 	return $wp_query->is_singular;
 }
 
+/**
+ * Whether the query contains a time.
+ *
+ * @since 1.5.0
+ * @uses $wp_query
+ *
+ * @return bool
+ */
 function is_time () {
 	global $wp_query;
 
 	return $wp_query->is_time;
 }
 
+/**
+ * Whether the query is a trackback.
+ *
+ * @since 1.5.0
+ * @uses $wp_query
+ *
+ * @return bool
+ */
 function is_trackback () {
 	global $wp_query;
 
 	return $wp_query->is_trackback;
 }
 
+/**
+ * Whether the query contains a year.
+ *
+ * @since 1.5.0
+ * @uses $wp_query
+ *
+ * @return bool
+ */
 function is_year () {
 	global $wp_query;
 
 	return $wp_query->is_year;
 }
 
+/**
+ * Whether current page query is a 404 and no results for WordPress query.
+ *
+ * @since 1.5.0
+ * @uses $wp_query
+ *
+ * @return bool True, if nothing is found matching WordPress Query.
+ */
 function is_404 () {
 	global $wp_query;
 
@@ -250,24 +595,57 @@ function is_404 () {
  * The Loop.  Post loop control.
  */
 
+/**
+ * Whether current WordPress query has results to loop over.
+ *
+ * @see WP_Query::have_posts()
+ * @since 1.5.0
+ * @uses $wp_query
+ *
+ * @return bool
+ */
 function have_posts() {
 	global $wp_query;
 
 	return $wp_query->have_posts();
 }
 
+/**
+ * Whether the caller is in the Loop.
+ *
+ * @since 2.0.0
+ * @uses $wp_query
+ *
+ * @return bool True if caller is within loop, false if loop hasn't started or ended.
+ */
 function in_the_loop() {
 	global $wp_query;
 
 	return $wp_query->in_the_loop;
 }
 
+/**
+ * Rewind the loop posts.
+ *
+ * @see WP_Query::rewind_posts()
+ * @since 1.5.0
+ * @uses $wp_query
+ *
+ * @return null
+ */
 function rewind_posts() {
 	global $wp_query;
 
 	return $wp_query->rewind_posts();
 }
 
+/**
+ * Iterate the post index in the loop.
+ *
+ * @see WP_Query::the_post()
+ * @since 1.5.0
+ * @uses $wp_query
+ */
 function the_post() {
 	global $wp_query;
 
@@ -278,11 +656,29 @@ function the_post() {
  * Comments loop.
  */
 
+/**
+ * Whether there are comments to loop over.
+ *
+ * @see WP_Query::have_comments()
+ * @since 2.2.0
+ * @uses $wp_query
+ *
+ * @return bool
+ */
 function have_comments() {
 	global $wp_query;
 	return $wp_query->have_comments();
 }
 
+/**
+ * Iterate comment index in the comment loop.
+ *
+ * @see WP_Query::the_comment()
+ * @since 2.2.0
+ * @uses $wp_query
+ *
+ * @return object
+ */
 function the_comment() {
 	global $wp_query;
 	return $wp_query->the_comment();
@@ -292,52 +688,405 @@ function the_comment() {
  * WP_Query
  */
 
+/**
+ * The WordPress Query class.
+ *
+ * @link http://codex.wordpress.org/Function_Reference/WP_Query Codex page.
+ *
+ * @since 1.5.0
+ */
 class WP_Query {
+
+	/**
+	 * Query string
+	 *
+	 * @since 1.5.0
+	 * @access public
+	 * @var string
+	 */
 	var $query;
+
+	/**
+	 * Query search variables set by the user.
+	 *
+	 * @since 1.5.0
+	 * @access public
+	 * @var array
+	 */
 	var $query_vars = array();
+
+	/**
+	 * Holds the data for a single object that is queried.
+	 *
+	 * Holds the contents of a post, page, category, attachment.
+	 *
+	 * @since 1.5.0
+	 * @access public
+	 * @var object|array
+	 */
 	var $queried_object;
+
+	/**
+	 * The ID of the queried object.
+	 *
+	 * @since 1.5.0
+	 * @access public
+	 * @var int
+	 */
 	var $queried_object_id;
+
+	/**
+	 * Get post database query.
+	 *
+	 * @since 2.0.1
+	 * @access public
+	 * @var string
+	 */
 	var $request;
 
+	/**
+	 * List of posts.
+	 *
+	 * @since 1.5.0
+	 * @access public
+	 * @var array
+	 */
 	var $posts;
+
+	/**
+	 * The amount of posts for the current query.
+	 *
+	 * @since 1.5.0
+	 * @access public
+	 * @var int
+	 */
 	var $post_count = 0;
+
+	/**
+	 * Index of the current item in the loop.
+	 *
+	 * @since 1.5.0
+	 * @access public
+	 * @var int
+	 */
 	var $current_post = -1;
+
+	/**
+	 * Whether the loop has started and the caller is in the loop.
+	 *
+	 * @since 2.0.0
+	 * @access public
+	 * @var bool
+	 */
 	var $in_the_loop = false;
+
+	/**
+	 * The current post ID.
+	 *
+	 * @since 1.5.0
+	 * @access public
+	 * @var int
+	 */
 	var $post;
 
+	/**
+	 * The list of comments for current post.
+	 *
+	 * @since 2.2.0
+	 * @access public
+	 * @var array
+	 */
 	var $comments;
+
+	/**
+	 * The amount of comments for the posts.
+	 *
+	 * @since 2.2.0
+	 * @access public
+	 * @var int
+	 */
 	var $comment_count = 0;
+
+	/**
+	 * The index of the comment in the comment loop.
+	 *
+	 * @since 2.2.0
+	 * @access public
+	 * @var int
+	 */
 	var $current_comment = -1;
+
+	/**
+	 * Current comment ID.
+	 *
+	 * @since 2.2.0
+	 * @access public
+	 * @var int
+	 */
 	var $comment;
 
+	/**
+	 * Amount of posts if limit clause was not used.
+	 *
+	 * @since 2.1.0
+	 * @access public
+	 * @var int
+	 */
 	var $found_posts = 0;
+
+	/**
+	 * The amount of pages.
+	 *
+	 * @since 2.1.0
+	 * @access public
+	 * @var int
+	 */
 	var $max_num_pages = 0;
 
+	/**
+	 * The amount of comment pages.
+	 *
+	 * @since 2.7.0
+	 * @access public
+	 * @var int
+	 */
+	var $max_num_comment_pages = 0;
+
+	/**
+	 * Set if query is single post.
+	 *
+	 * @since 1.5.0
+	 * @access public
+	 * @var bool
+	 */
 	var $is_single = false;
+
+	/**
+	 * Set if query is preview of blog.
+	 *
+	 * @since 2.0.0
+	 * @access public
+	 * @var bool
+	 */
 	var $is_preview = false;
+
+	/**
+	 * Set if query returns a page.
+	 *
+	 * @since 1.5.0
+	 * @access public
+	 * @var bool
+	 */
 	var $is_page = false;
+
+	/**
+	 * Set if query is an archive list.
+	 *
+	 * @since 1.5.0
+	 * @access public
+	 * @var bool
+	 */
 	var $is_archive = false;
+
+	/**
+	 * Set if query is part of a date.
+	 *
+	 * @since 1.5.0
+	 * @access public
+	 * @var bool
+	 */
 	var $is_date = false;
+
+	/**
+	 * Set if query contains a year.
+	 *
+	 * @since 1.5.0
+	 * @access public
+	 * @var bool
+	 */
 	var $is_year = false;
+
+	/**
+	 * Set if query contains a month.
+	 *
+	 * @since 1.5.0
+	 * @access public
+	 * @var bool
+	 */
 	var $is_month = false;
+
+	/**
+	 * Set if query contains a day.
+	 *
+	 * @since 1.5.0
+	 * @access public
+	 * @var bool
+	 */
 	var $is_day = false;
+
+	/**
+	 * Set if query contains time.
+	 *
+	 * @since 1.5.0
+	 * @access public
+	 * @var bool
+	 */
 	var $is_time = false;
+
+	/**
+	 * Set if query contains an author.
+	 *
+	 * @since 1.5.0
+	 * @access public
+	 * @var bool
+	 */
 	var $is_author = false;
+
+	/**
+	 * Set if query contains category.
+	 *
+	 * @since 1.5.0
+	 * @access public
+	 * @var bool
+	 */
 	var $is_category = false;
+
+	/**
+	 * Set if query contains tag.
+	 *
+	 * @since 2.3.0
+	 * @access public
+	 * @var bool
+	 */
 	var $is_tag = false;
+
+	/**
+	 * Set if query contains taxonomy.
+	 *
+	 * @since 2.5.0
+	 * @access public
+	 * @var bool
+	 */
+	var $is_tax = false;
+
+	/**
+	 * Set if query was part of a search result.
+	 *
+	 * @since 1.5.0
+	 * @access public
+	 * @var bool
+	 */
 	var $is_search = false;
+
+	/**
+	 * Set if query is feed display.
+	 *
+	 * @since 1.5.0
+	 * @access public
+	 * @var bool
+	 */
 	var $is_feed = false;
+
+	/**
+	 * Set if query is comment feed display.
+	 *
+	 * @since 2.2.0
+	 * @access public
+	 * @var bool
+	 */
 	var $is_comment_feed = false;
+
+	/**
+	 * Set if query is trackback.
+	 *
+	 * @since 1.5.0
+	 * @access public
+	 * @var bool
+	 */
 	var $is_trackback = false;
+
+	/**
+	 * Set if query is blog homepage.
+	 *
+	 * @since 1.5.0
+	 * @access public
+	 * @var bool
+	 */
 	var $is_home = false;
+
+	/**
+	 * Set if query couldn't found anything.
+	 *
+	 * @since 1.5.0
+	 * @access public
+	 * @var bool
+	 */
 	var $is_404 = false;
+
+	/**
+	 * Set if query is within comments popup window.
+	 *
+	 * @since 1.5.0
+	 * @access public
+	 * @var bool
+	 */
 	var $is_comments_popup = false;
+
+	/**
+	 * Set if query is part of administration page.
+	 *
+	 * @since 1.5.0
+	 * @access public
+	 * @var bool
+	 */
 	var $is_admin = false;
+
+	/**
+	 * Set if query is an attachment.
+	 *
+	 * @since 2.0.0
+	 * @access public
+	 * @var bool
+	 */
 	var $is_attachment = false;
+
+	/**
+	 * Set if is single, is a page, or is an attachment.
+	 *
+	 * @since 2.1.0
+	 * @access public
+	 * @var bool
+	 */
 	var $is_singular = false;
+
+	/**
+	 * Set if query is for robots.
+	 *
+	 * @since 2.1.0
+	 * @access public
+	 * @var bool
+	 */
 	var $is_robots = false;
+
+	/**
+	 * Set if query contains posts.
+	 *
+	 * Basically, the homepage if the option isn't set for the static homepage.
+	 *
+	 * @since 2.1.0
+	 * @access public
+	 * @var bool
+	 */
 	var $is_posts_page = false;
 
+	/**
+	 * Resets query flags to false.
+	 *
+	 * The query flags are what page info WordPress was able to figure out.
+	 *
+	 * @since 2.0.0
+	 * @access private
+	 */
 	function init_query_flags() {
 		$this->is_single = false;
 		$this->is_page = false;
@@ -350,6 +1099,7 @@ class WP_Query {
 		$this->is_author = false;
 		$this->is_category = false;
 		$this->is_tag = false;
+		$this->is_tax = false;
 		$this->is_search = false;
 		$this->is_feed = false;
 		$this->is_comment_feed = false;
@@ -364,6 +1114,12 @@ class WP_Query {
 		$this->is_posts_page = false;
 	}
 
+	/**
+	 * Initiates object properties and sets default values.
+	 *
+	 * @since 1.5.0
+	 * @access public
+	 */
 	function init () {
 		unset($this->posts);
 		unset($this->query);
@@ -377,16 +1133,31 @@ class WP_Query {
 		$this->init_query_flags();
 	}
 
-	// Reparse the query vars.
+	/**
+	 * Reparse the query vars.
+	 *
+	 * @since 1.5.0
+	 * @access public
+	 */
 	function parse_query_vars() {
 		$this->parse_query('');
 	}
 
+	/**
+	 * Fills in the query variables, which do not exist within the parameter.
+	 *
+	 * @since 2.1.0
+	 * @access public
+	 *
+	 * @param array $array Defined query variables.
+	 * @return array Complete query variables with undefined ones filled in empty.
+	 */
 	function fill_query_vars($array) {
 		$keys = array(
 			'error'
 			, 'm'
 			, 'p'
+			, 'post_parent'
 			, 'subpost'
 			, 'subpost_id'
 			, 'attachment'
@@ -405,12 +1176,15 @@ class WP_Query {
 			, 'w'
 			, 'category_name'
 			, 'tag'
+			, 'cat'
 			, 'tag_id'
 			, 'author_name'
 			, 'feed'
 			, 'tb'
 			, 'paged'
 			, 'comments_popup'
+			, 'meta_key'
+			, 'meta_value'
 			, 'preview'
 		);
 
@@ -419,7 +1193,7 @@ class WP_Query {
 				$array[$key] = '';
 		}
 
-		$array_keys = array('category__in', 'category__not_in', 'category__and',
+		$array_keys = array('category__in', 'category__not_in', 'category__and', 'post__in', 'post__not_in',
 			'tag__in', 'tag__not_in', 'tag__and', 'tag_slug__in', 'tag_slug__and');
 
 		foreach ( $array_keys as $key ) {
@@ -429,7 +1203,14 @@ class WP_Query {
 		return $array;
 	}
 
-	// Parse a query string and set query type booleans.
+	/**
+	 * Parse a query string and set query type booleans.
+	 *
+	 * @since 1.5.0
+	 * @access public
+	 *
+	 * @param string|array $query
+	 */
 	function parse_query ($query) {
 		if ( !empty($query) || !isset($this->query) ) {
 			$this->init();
@@ -446,16 +1227,19 @@ class WP_Query {
 		if ( ! empty($qv['robots']) )
 			$this->is_robots = true;
 
-		$qv['p'] =  (int) $qv['p'];
-		$qv['page_id'] =  (int) $qv['page_id'];
-		$qv['year'] = (int) $qv['year'];
-		$qv['monthnum'] = (int) $qv['monthnum'];
-		$qv['day'] = (int) $qv['day'];
-		$qv['w'] = (int) $qv['w'];
-		$qv['m'] =  (int) $qv['m'];
-		if ( '' !== $qv['hour'] ) $qv['hour'] = (int) $qv['hour'];
-		if ( '' !== $qv['minute'] ) $qv['minute'] = (int) $qv['minute'];
-		if ( '' !== $qv['second'] ) $qv['second'] = (int) $qv['second'];
+		$qv['p'] =  absint($qv['p']);
+		$qv['page_id'] =  absint($qv['page_id']);
+		$qv['year'] = absint($qv['year']);
+		$qv['monthnum'] = absint($qv['monthnum']);
+		$qv['day'] = absint($qv['day']);
+		$qv['w'] = absint($qv['w']);
+		$qv['m'] = absint($qv['m']);
+		$qv['cat'] = preg_replace( '|[^0-9,-]|', '', $qv['cat'] ); // comma separated list of positive or negative integers
+		$qv['pagename'] = trim( $qv['pagename'] );
+		$qv['name'] = trim( $qv['name'] );
+		if ( '' !== $qv['hour'] ) $qv['hour'] = absint($qv['hour']);
+		if ( '' !== $qv['minute'] ) $qv['minute'] = absint($qv['minute']);
+		if ( '' !== $qv['second'] ) $qv['second'] = absint($qv['second']);
 
 		// Compat.  Map subpost to attachment.
 		if ( '' != $qv['subpost'] )
@@ -463,7 +1247,7 @@ class WP_Query {
 		if ( '' != $qv['subpost_id'] )
 			$qv['attachment_id'] = $qv['subpost_id'];
 
-		$qv['attachment_id'] = (int) $qv['attachment_id'];
+		$qv['attachment_id'] = absint($qv['attachment_id']);
 
 		if ( ('' != $qv['attachment']) || !empty($qv['attachment_id']) ) {
 			$this->is_single = true;
@@ -554,47 +1338,47 @@ class WP_Query {
 			if ( !is_array($qv['category__in']) || empty($qv['category__in']) ) {
 				$qv['category__in'] = array();
 			} else {
-				$qv['category__in'] = array_map('intval', $qv['category__in']);
+				$qv['category__in'] = array_map('absint', $qv['category__in']);
 				$this->is_category = true;
 			}
 
-			if ( !is_array($qv['category___not_in']) || empty($qv['category__not_in']) ) {
+			if ( !is_array($qv['category__not_in']) || empty($qv['category__not_in']) ) {
 				$qv['category__not_in'] = array();
 			} else {
-				$qv['category__not_in'] = array_map('intval', $qv['category__not_in']);
+				$qv['category__not_in'] = array_map('absint', $qv['category__not_in']);
 			}
 
 			if ( !is_array($qv['category__and']) || empty($qv['category__and']) ) {
 				$qv['category__and'] = array();
 			} else {
-				$qv['category__and'] = array_map('intval', $qv['category__and']);
+				$qv['category__and'] = array_map('absint', $qv['category__and']);
 				$this->is_category = true;
 			}
 
 			if (  '' != $qv['tag'] )
 				$this->is_tag = true;
 
-			$qv['tag_id'] = (int) $qv['tag_id'];
+			$qv['tag_id'] = absint($qv['tag_id']);
 			if (  !empty($qv['tag_id']) )
 				$this->is_tag = true;
 
 			if ( !is_array($qv['tag__in']) || empty($qv['tag__in']) ) {
 				$qv['tag__in'] = array();
 			} else {
-				$qv['tag__in'] = array_map('intval', $qv['tag__in']);
+				$qv['tag__in'] = array_map('absint', $qv['tag__in']);
 				$this->is_tag = true;
 			}
 
-			if ( !is_array($qv['tag___not_in']) || empty($qv['tag__not_in']) ) {
+			if ( !is_array($qv['tag__not_in']) || empty($qv['tag__not_in']) ) {
 				$qv['tag__not_in'] = array();
 			} else {
-				$qv['tag__not_in'] = array_map('intval', $qv['tag__not_in']);
+				$qv['tag__not_in'] = array_map('absint', $qv['tag__not_in']);
 			}
 
 			if ( !is_array($qv['tag__and']) || empty($qv['tag__and']) ) {
 				$qv['tag__and'] = array();
 			} else {
-				$qv['tag__and'] = array_map('intval', $qv['tag__and']);
+				$qv['tag__and'] = array_map('absint', $qv['tag__and']);
 				$this->is_category = true;
 			}
 
@@ -612,6 +1396,20 @@ class WP_Query {
 				$this->is_tag = true;
 			}
 
+			if ( empty($qv['taxonomy']) || empty($qv['term']) ) {
+				$this->is_tax = false;
+				foreach ( $GLOBALS['wp_taxonomies'] as $taxonomy => $t ) {
+					if ( $t->query_var && isset($qv[$t->query_var]) && '' != $qv[$t->query_var] ) {
+						$qv['taxonomy'] = $taxonomy;
+						$qv['term'] = $qv[$t->query_var];
+						$this->is_tax = true;
+						break;
+					}
+				}
+			} else {
+				$this->is_tax = true;
+			}
+
 			if ( empty($qv['author']) || ($qv['author'] == '0') ) {
 				$this->is_author = false;
 			} else {
@@ -622,7 +1420,7 @@ class WP_Query {
 				$this->is_author = true;
 			}
 
-			if ( ($this->is_date || $this->is_author || $this->is_category || $this->is_tag ) )
+			if ( ($this->is_date || $this->is_author || $this->is_category || $this->is_tag || $this->is_tax) )
 				$this->is_archive = true;
 		}
 
@@ -655,7 +1453,7 @@ class WP_Query {
 		if ( $this->is_feed && ( !empty($qv['withcomments']) || ( empty($qv['withoutcomments']) && $this->is_singular ) ) )
 			$this->is_comment_feed = true;
 
-		if ( !( $this->is_singular || $this->is_archive || $this->is_search || $this->is_feed || $this->is_trackback || $this->is_404 || $this->is_admin || $this->is_comments_popup ) )
+		if ( !( $this->is_singular || $this->is_archive || $this->is_search || $this->is_feed || $this->is_trackback || $this->is_404 || $this->is_admin || $this->is_comments_popup || $this->is_robots ) )
 			$this->is_home = true;
 
 		// Correct is_* for page_on_front and page_for_posts
@@ -691,9 +1489,9 @@ class WP_Query {
 			$qv['post_type'] = sanitize_user($qv['post_type'], true);
 
 		if ( !empty($qv['post_status']) )
-			$qv['post_status'] = sanitize_user($qv['post_status'], true);
+			$qv['post_status'] = preg_replace('|[^a-z0-9_,-]|', '', $qv['post_status']);
 
-		if ( $this->is_posts_page && !$qv['withcomments'] )
+		if ( $this->is_posts_page && ( ! isset($qv['withcomments']) || ! $qv['withcomments'] ) )
 			$this->is_comment_feed = false;
 
 		$this->is_singular = $this->is_single || $this->is_page || $this->is_attachment;
@@ -706,6 +1504,12 @@ class WP_Query {
 			do_action_ref_array('parse_query', array(&$this));
 	}
 
+	/**
+	 * Sets the 404 property and saves whether query is feed.
+	 *
+	 * @since 2.0.0
+	 * @access public
+	 */
 	function set_404() {
 		$is_feed = $this->is_feed;
 
@@ -715,6 +1519,15 @@ class WP_Query {
 		$this->is_feed = $is_feed;
 	}
 
+	/**
+	 * Retrieve query variable.
+	 *
+	 * @since 1.5.0
+	 * @access public
+	 *
+	 * @param string $query_var Query variable key.
+	 * @return mixed
+	 */
 	function get($query_var) {
 		if (isset($this->query_vars[$query_var])) {
 			return $this->query_vars[$query_var];
@@ -723,12 +1536,33 @@ class WP_Query {
 		return '';
 	}
 
+	/**
+	 * Set query variable.
+	 *
+	 * @since 1.5.0
+	 * @access public
+	 *
+	 * @param string $query_var Query variable key.
+	 * @param mixed $value Query variable value.
+	 */
 	function set($query_var, $value) {
 		$this->query_vars[$query_var] = $value;
 	}
 
+	/**
+	 * Retrieve the posts based on query variables.
+	 *
+	 * There are a few filters and actions that can be used to modify the post
+	 * database query.
+	 *
+	 * @since 1.5.0
+	 * @access public
+	 * @uses do_action_ref_array() Calls 'pre_get_posts' hook before retrieving posts.
+	 *
+	 * @return array List of posts.
+	 */
 	function &get_posts() {
-		global $wpdb, $pagenow, $user_ID;
+		global $wpdb, $user_ID;
 
 		do_action_ref_array('pre_get_posts', array(&$this));
 
@@ -741,16 +1575,28 @@ class WP_Query {
 		$distinct = '';
 		$whichcat = '';
 		$whichauthor = '';
-		$whichpage = '';
-		$result = '';
+		$whichmimetype = '';
 		$where = '';
 		$limits = '';
 		$join = '';
 		$search = '';
 		$groupby = '';
+		$fields = "$wpdb->posts.*";
+		$post_status_join = false;
+		$page = 1;
+
+		if ( !isset($q['caller_get_posts']) )
+			$q['caller_get_posts'] = false;
 
-		if ( !isset($q['post_type']) )
-			$q['post_type'] = 'post';
+		if ( !isset($q['suppress_filters']) )
+			$q['suppress_filters'] = false;
+
+		if ( !isset($q['post_type']) ) {
+			if ( $this->is_search )
+				$q['post_type'] = 'any';
+			else
+				$q['post_type'] = 'post';
+		}
 		$post_type = $q['post_type'];
 		if ( !isset($q['posts_per_page']) || $q['posts_per_page'] == 0 )
 			$q['posts_per_page'] = get_option('posts_per_page');
@@ -777,6 +1623,9 @@ class WP_Query {
 		else if ( $q['posts_per_page'] == 0 )
 			$q['posts_per_page'] = 1;
 
+		if ( !isset($q['comments_per_page']) || $q['comments_per_page'] == 0 )
+			$q['comments_per_page'] = get_option('comments_per_page');
+
 		if ( $this->is_home && (empty($this->query) || $q['preview'] == 'true') && ( 'page' == get_option('show_on_front') ) && get_option('page_on_front') ) {
 			$this->is_page = true;
 			$this->is_home = false;
@@ -785,51 +1634,46 @@ class WP_Query {
 
 		if (isset($q['page'])) {
 			$q['page'] = trim($q['page'], '/');
-			$q['page'] = (int) $q['page'];
-			$q['page'] = abs($q['page']);
+			$q['page'] = absint($q['page']);
 		}
 
-		$add_hours = intval(get_option('gmt_offset'));
-		$add_minutes = intval(60 * (get_option('gmt_offset') - $add_hours));
-		$wp_posts_post_date_field = "post_date"; // "DATE_ADD(post_date, INTERVAL '$add_hours:$add_minutes' HOUR_MINUTE)";
-
 		// If a month is specified in the querystring, load that month
 		if ( $q['m'] ) {
 			$q['m'] = '' . preg_replace('|[^0-9]|', '', $q['m']);
-			$where .= ' AND YEAR(post_date)=' . substr($q['m'], 0, 4);
+			$where .= " AND YEAR($wpdb->posts.post_date)=" . substr($q['m'], 0, 4);
 			if (strlen($q['m'])>5)
-				$where .= ' AND MONTH(post_date)=' . substr($q['m'], 4, 2);
+				$where .= " AND MONTH($wpdb->posts.post_date)=" . substr($q['m'], 4, 2);
 			if (strlen($q['m'])>7)
-				$where .= ' AND DAYOFMONTH(post_date)=' . substr($q['m'], 6, 2);
+				$where .= " AND DAYOFMONTH($wpdb->posts.post_date)=" . substr($q['m'], 6, 2);
 			if (strlen($q['m'])>9)
-				$where .= ' AND HOUR(post_date)=' . substr($q['m'], 8, 2);
+				$where .= " AND HOUR($wpdb->posts.post_date)=" . substr($q['m'], 8, 2);
 			if (strlen($q['m'])>11)
-				$where .= ' AND MINUTE(post_date)=' . substr($q['m'], 10, 2);
+				$where .= " AND MINUTE($wpdb->posts.post_date)=" . substr($q['m'], 10, 2);
 			if (strlen($q['m'])>13)
-				$where .= ' AND SECOND(post_date)=' . substr($q['m'], 12, 2);
+				$where .= " AND SECOND($wpdb->posts.post_date)=" . substr($q['m'], 12, 2);
 		}
 
 		if ( '' !== $q['hour'] )
-			$where .= " AND HOUR(post_date)='" . $q['hour'] . "'";
+			$where .= " AND HOUR($wpdb->posts.post_date)='" . $q['hour'] . "'";
 
 		if ( '' !== $q['minute'] )
-			$where .= " AND MINUTE(post_date)='" . $q['minute'] . "'";
+			$where .= " AND MINUTE($wpdb->posts.post_date)='" . $q['minute'] . "'";
 
 		if ( '' !== $q['second'] )
-			$where .= " AND SECOND(post_date)='" . $q['second'] . "'";
+			$where .= " AND SECOND($wpdb->posts.post_date)='" . $q['second'] . "'";
 
 		if ( $q['year'] )
-			$where .= " AND YEAR(post_date)='" . $q['year'] . "'";
+			$where .= " AND YEAR($wpdb->posts.post_date)='" . $q['year'] . "'";
 
 		if ( $q['monthnum'] )
-			$where .= " AND MONTH(post_date)='" . $q['monthnum'] . "'";
+			$where .= " AND MONTH($wpdb->posts.post_date)='" . $q['monthnum'] . "'";
 
 		if ( $q['day'] )
-			$where .= " AND DAYOFMONTH(post_date)='" . $q['day'] . "'";
+			$where .= " AND DAYOFMONTH($wpdb->posts.post_date)='" . $q['day'] . "'";
 
 		if ('' != $q['name']) {
 			$q['name'] = sanitize_title($q['name']);
-			$where .= " AND post_name = '" . $q['name'] . "'";
+			$where .= " AND $wpdb->posts.post_name = '" . $q['name'] . "'";
 		} else if ('' != $q['pagename']) {
 			if ( isset($this->queried_object_id) )
 				$reqpage = $this->queried_object_id;
@@ -841,39 +1685,56 @@ class WP_Query {
 					$reqpage = 0;
 			}
 
-			if  ( ('page' != get_option('show_on_front') ) || ( $reqpage != get_option('page_for_posts') ) ) {
+			$page_for_posts = get_option('page_for_posts');
+			if  ( ('page' != get_option('show_on_front') ) ||  empty($page_for_posts) || ( $reqpage != $page_for_posts ) ) {
 				$q['pagename'] = str_replace('%2F', '/', urlencode(urldecode($q['pagename'])));
 				$page_paths = '/' . trim($q['pagename'], '/');
 				$q['pagename'] = sanitize_title(basename($page_paths));
 				$q['name'] = $q['pagename'];
-				$where .= " AND (ID = '$reqpage')";
+				$where .= " AND ($wpdb->posts.ID = '$reqpage')";
+				$reqpage_obj = get_page($reqpage);
+				if ( is_object($reqpage_obj) && 'attachment' == $reqpage_obj->post_type ) {
+					$this->is_attachment = true;
+					$this->is_page = true;
+					$q['attachment_id'] = $reqpage;
+				}
 			}
 		} elseif ('' != $q['attachment']) {
 			$q['attachment'] = str_replace('%2F', '/', urlencode(urldecode($q['attachment'])));
 			$attach_paths = '/' . trim($q['attachment'], '/');
 			$q['attachment'] = sanitize_title(basename($attach_paths));
 			$q['name'] = $q['attachment'];
-			$where .= " AND post_name = '" . $q['attachment'] . "'";
+			$where .= " AND $wpdb->posts.post_name = '" . $q['attachment'] . "'";
 		}
 
 		if ( $q['w'] )
-			$where .= " AND WEEK(post_date, 1)='" . $q['w'] . "'";
+			$where .= " AND WEEK($wpdb->posts.post_date, 1)='" . $q['w'] . "'";
 
 		if ( intval($q['comments_popup']) )
-			$q['p'] = intval($q['comments_popup']);
+			$q['p'] = absint($q['comments_popup']);
 
 		// If an attachment is requested by number, let it supercede any post number.
 		if ( $q['attachment_id'] )
-			$q['p'] = $q['attachment_id'];
+			$q['p'] = absint($q['attachment_id']);
 
 		// If a post number is specified, load that post
-		if ( $q['p'] )
-			$where = ' AND ID = ' . $q['p'];
+		if ( $q['p'] ) {
+			$where .= " AND {$wpdb->posts}.ID = " . $q['p'];
+		} elseif ( $q['post__in'] ) {
+			$post__in = implode(',', array_map( 'absint', $q['post__in'] ));
+			$where .= " AND {$wpdb->posts}.ID IN ($post__in)";
+		} elseif ( $q['post__not_in'] ) {
+			$post__not_in = implode(',',  array_map( 'absint', $q['post__not_in'] ));
+			$where .= " AND {$wpdb->posts}.ID NOT IN ($post__not_in)";
+		}
+
+		if ( is_numeric($q['post_parent']) )
+			$where .= $wpdb->prepare( " AND $wpdb->posts.post_parent = %d ", $q['post_parent'] );
 
 		if ( $q['page_id'] ) {
 			if  ( ('page' != get_option('show_on_front') ) || ( $q['page_id'] != get_option('page_for_posts') ) ) {
 				$q['p'] = $q['page_id'];
-				$where = ' AND ID = ' . $q['page_id'];
+				$where = " AND {$wpdb->posts}.ID = " . $q['page_id'];
 			}
 		}
 
@@ -881,26 +1742,28 @@ class WP_Query {
 		if ( !empty($q['s']) ) {
 			// added slashes screw with quote grouping when done early, so done later
 			$q['s'] = stripslashes($q['s']);
-			if ($q['sentence']) {
+			if ( !empty($q['sentence']) ) {
 				$q['search_terms'] = array($q['s']);
-			}
-			else {
-				preg_match_all('/".*?("|$)|((?<=[\\s",+])|^)[^\\s",+]+/', $q[s], $matches);
+			} else {
+				preg_match_all('/".*?("|$)|((?<=[\\s",+])|^)[^\\s",+]+/', $q['s'], $matches);
 				$q['search_terms'] = array_map(create_function('$a', 'return trim($a, "\\"\'\\n\\r ");'), $matches[0]);
 			}
-			$n = ($q['exact']) ? '' : '%';
+			$n = !empty($q['exact']) ? '' : '%';
 			$searchand = '';
-			foreach((array)$q['search_terms'] as $term) {
+			foreach( (array) $q['search_terms'] as $term) {
 				$term = addslashes_gpc($term);
-				$search .= "{$searchand}((post_title LIKE '{$n}{$term}{$n}') OR (post_content LIKE '{$n}{$term}{$n}'))";
+				$search .= "{$searchand}(($wpdb->posts.post_title LIKE '{$n}{$term}{$n}') OR ($wpdb->posts.post_content LIKE '{$n}{$term}{$n}'))";
 				$searchand = ' AND ';
 			}
-			$term = addslashes_gpc($q['s']);
-			if (!$q['sentence'] && count($q['search_terms']) > 1 && $q['search_terms'][0] != $q['s'] )
-				$search .= " OR (post_title LIKE '{$n}{$term}{$n}') OR (post_content LIKE '{$n}{$term}{$n}')";
+			$term = $wpdb->escape($q['s']);
+			if (empty($q['sentence']) && count($q['search_terms']) > 1 && $q['search_terms'][0] != $q['s'] )
+				$search .= " OR ($wpdb->posts.post_title LIKE '{$n}{$term}{$n}') OR ($wpdb->posts.post_content LIKE '{$n}{$term}{$n}')";
 
-			if ( !empty($search) )
+			if ( !empty($search) ) {
 				$search = " AND ({$search}) ";
+				if ( !is_user_logged_in() )
+					$search .= " AND ($wpdb->posts.post_password = '') ";
+			}
 		}
 
 		// Category stuff
@@ -913,8 +1776,11 @@ class WP_Query {
 			$q['cat'] = ''.urldecode($q['cat']).'';
 			$q['cat'] = addslashes_gpc($q['cat']);
 			$cat_array = preg_split('/[,\s]+/', $q['cat']);
-			foreach ( $cat_array as $cat ) {
+			$q['cat'] = '';
+			$req_cats = array();
+			foreach ( (array) $cat_array as $cat ) {
 				$cat = intval($cat);
+				$req_cats[] = $cat;
 				$in = ($cat > 0);
 				$cat = abs($cat);
 				if ( $in ) {
@@ -925,10 +1791,7 @@ class WP_Query {
 					$q['category__not_in'] = array_merge($q['category__not_in'], get_term_children($cat, 'category'));
 				}
 			}
-		}
-
-		if ( !empty($q['category__in']) || !empty($q['category__not_in']) || !empty($q['category__and']) ) {
-			$groupby = "{$wpdb->posts}.ID";
+			$q['cat'] = implode(',', $req_cats);
 		}
 
 		if ( !empty($q['category__in']) ) {
@@ -939,17 +1802,19 @@ class WP_Query {
 		}
 
 		if ( !empty($q['category__not_in']) ) {
-			$ids = get_objects_in_term($q['category__not_in'], 'category');
-			if ( is_wp_error( $ids ) ) 
-				return $ids;
-			if ( is_array($ids) && count($ids > 0) ) {
-				$out_posts = "'" . implode("', '", $ids) . "'";
-				$whichcat .= " AND $wpdb->posts.ID NOT IN ($out_posts)";
+			if ( $wpdb->has_cap( 'subqueries' ) ) {
+				$cat_string = "'" . implode("', '", $q['category__not_in']) . "'";
+				$whichcat .= " AND $wpdb->posts.ID NOT IN ( SELECT tr.object_id FROM $wpdb->term_relationships AS tr INNER JOIN $wpdb->term_taxonomy AS tt ON tr.term_taxonomy_id = tt.term_taxonomy_id WHERE tt.taxonomy = 'category' AND tt.term_id IN ($cat_string) )";
+			} else {
+				$ids = get_objects_in_term($q['category__not_in'], 'category');
+				if ( !is_wp_error($ids) && is_array($ids) && count($ids) > 0 )
+					$whichcat .= " AND $wpdb->posts.ID NOT IN ('" . implode("', '", $ids) . "')";
 			}
 		}
 
 		// Category stuff for nice URLs
-		if ( '' != $q['category_name'] ) {
+		if ( '' != $q['category_name'] && !$this->is_singular ) {
+			$q['category_name'] = implode('/', array_map('sanitize_title', explode('/', $q['category_name'])));
 			$reqcat = get_category_by_path($q['category_name']);
 			$q['category_name'] = str_replace('%2F', '/', urlencode(urldecode($q['category_name'])));
 			$cat_paths = '/' . trim($q['category_name'], '/');
@@ -990,7 +1855,7 @@ class WP_Query {
 					$tag = sanitize_term_field('slug', $tag, 0, 'post_tag', 'db');
 					$q['tag_slug__in'][] = $tag;
 				}
-			} else if ( preg_match('/[+\s]+/', $q['tag']) ) {
+			} else if ( preg_match('/[+\s]+/', $q['tag']) || !empty($q['cat']) ) {
 				$tags = preg_split('/[+\s]+/', $q['tag']);
 				foreach ( (array) $tags as $tag ) {
 					$tag = sanitize_term_field('slug', $tag, 0, 'post_tag', 'db');
@@ -998,23 +1863,15 @@ class WP_Query {
 				}
 			} else {
 				$q['tag'] = sanitize_term_field('slug', $q['tag'], 0, 'post_tag', 'db');
-				$reqtag = is_term( $q['tag'], 'post_tag' );
-				if ( !empty($reqtag) )
-					$reqtag = $reqtag['term_id'];
-				else
-					$reqtag = 0;
-
-				$q['tag_id'] = $reqtag;
-				$q['tag__in'][] = $reqtag;
+				$q['tag_slug__in'][] = $q['tag'];
 			}
 		}
 
-		if ( !empty($q['tag__in']) || !empty($q['tag__not_in']) || !empty($q['tag__and']) ||
-			!empty($q['tag_slug__in']) || !empty($q['tag_slug__and']) ) {
+		if ( !empty($q['category__in']) || !empty($q['meta_key']) || !empty($q['tag__in']) || !empty($q['tag_slug__in']) ) {
 			$groupby = "{$wpdb->posts}.ID";
 		}
 
-		if ( !empty($q['tag__in']) ) {
+		if ( !empty($q['tag__in']) && empty($q['cat']) ) {
 			$join = " INNER JOIN $wpdb->term_relationships ON ($wpdb->posts.ID = $wpdb->term_relationships.object_id) INNER JOIN $wpdb->term_taxonomy ON ($wpdb->term_relationships.term_taxonomy_id = $wpdb->term_taxonomy.term_taxonomy_id) ";
 			$whichcat .= " AND $wpdb->term_taxonomy.taxonomy = 'post_tag' ";
 			$include_tags = "'" . implode("', '", $q['tag__in']) . "'";
@@ -1024,28 +1881,33 @@ class WP_Query {
 				$q['tag_id'] = $reqtag['term_id'];
 		}
 
-		if ( !empty($q['tag_slug__in']) ) {
+		if ( !empty($q['tag_slug__in']) && empty($q['cat']) ) {
 			$join = " INNER JOIN $wpdb->term_relationships ON ($wpdb->posts.ID = $wpdb->term_relationships.object_id) INNER JOIN $wpdb->term_taxonomy ON ($wpdb->term_relationships.term_taxonomy_id = $wpdb->term_taxonomy.term_taxonomy_id) INNER JOIN $wpdb->terms ON ($wpdb->term_taxonomy.term_id = $wpdb->terms.term_id) ";
 			$whichcat .= " AND $wpdb->term_taxonomy.taxonomy = 'post_tag' ";
 			$include_tags = "'" . implode("', '", $q['tag_slug__in']) . "'";
 			$whichcat .= " AND $wpdb->terms.slug IN ($include_tags) ";
-			$reqtag = is_term( $q['tag_slug__in'][0], 'post_tag' );
+			$reqtag = get_term_by( 'slug', $q['tag_slug__in'][0], 'post_tag' );
 			if ( !empty($reqtag) )
-				$q['tag_id'] = $reqtag['term_id'];
+				$q['tag_id'] = $reqtag->term_id;
 		}
 
 		if ( !empty($q['tag__not_in']) ) {
-			$ids = get_objects_in_term($q['tag__not_in'], 'post_tag');
-			if ( is_array($ids) && count($ids > 0) ) {
-				$out_posts = "'" . implode("', '", $ids) . "'";
-				$whichcat .= " AND $wpdb->posts.ID NOT IN ($out_posts)";
+			if ( $wpdb->has_cap( 'subqueries' ) ) {
+				$tag_string = "'" . implode("', '", $q['tag__not_in']) . "'";
+				$whichcat .= " AND $wpdb->posts.ID NOT IN ( SELECT tr.object_id FROM $wpdb->term_relationships AS tr INNER JOIN $wpdb->term_taxonomy AS tt ON tr.term_taxonomy_id = tt.term_taxonomy_id WHERE tt.taxonomy = 'post_tag' AND tt.term_id IN ($tag_string) )";
+			} else {
+				$ids = get_objects_in_term($q['tag__not_in'], 'post_tag');
+				if ( !is_wp_error($ids) && is_array($ids) && count($ids) > 0 )
+					$whichcat .= " AND $wpdb->posts.ID NOT IN ('" . implode("', '", $ids) . "')";
 			}
 		}
 
 		// Tag and slug intersections.
-		$intersections = array('category__and' => 'category', 'tag__and' => 'post_tag', 'tag_slug__and' => 'post_tag');
+		$intersections = array('category__and' => 'category', 'tag__and' => 'post_tag', 'tag_slug__and' => 'post_tag', 'tag__in' => 'post_tag', 'tag_slug__in' => 'post_tag');
+		$tagin = array('tag__in', 'tag_slug__in'); // These are used to make some exceptions below
 		foreach ($intersections as $item => $taxonomy) {
 			if ( empty($q[$item]) ) continue;
+			if ( in_array($item, $tagin) && empty($q['cat']) ) continue; // We should already have what we need if categories aren't being used
 
 			if ( $item != 'category__and' ) {
 				$reqtag = is_term( $q[$item][0], 'post_tag' );
@@ -1053,13 +1915,17 @@ class WP_Query {
 					$q['tag_id'] = $reqtag['term_id'];
 			}
 
-			$taxonomy_field = $item == 'tag_slug__and' ? 'slug' : 'term_id';
+			if ( in_array( $item, array('tag_slug__and', 'tag_slug__in' ) ) )
+				$taxonomy_field = 'slug';
+			else
+				$taxonomy_field = 'term_id';
 
 			$q[$item] = array_unique($q[$item]);
 			$tsql = "SELECT p.ID FROM $wpdb->posts p INNER JOIN $wpdb->term_relationships tr ON (p.ID = tr.object_id) INNER JOIN $wpdb->term_taxonomy tt ON (tr.term_taxonomy_id = tt.term_taxonomy_id) INNER JOIN $wpdb->terms t ON (tt.term_id = t.term_id)";
 			$tsql .= " WHERE tt.taxonomy = '$taxonomy' AND t.$taxonomy_field IN ('" . implode("', '", $q[$item]) . "')";
-			$tsql .= " GROUP BY p.ID HAVING count(p.ID) = " . count($q[$item]);
-
+			if ( !in_array($item, $tagin) ) { // This next line is only helpful if we are doing an and relationship
+				$tsql .= " GROUP BY p.ID HAVING count(p.ID) = " . count($q[$item]);
+			}
 			$post_ids = $wpdb->get_col($tsql);
 
 			if ( count($post_ids) )
@@ -1070,6 +1936,38 @@ class WP_Query {
 			}
 		}
 
+		// Taxonomies
+		if ( $this->is_tax ) {
+			if ( '' != $q['taxonomy'] ) {
+				$taxonomy = $q['taxonomy'];
+				$tt[$taxonomy] = $q['term'];
+				$terms = get_terms($q['taxonomy'], array('slug'=>$q['term']));
+			} else {
+				foreach ( $GLOBALS['wp_taxonomies'] as $taxonomy => $t ) {
+					if ( $t->query_var && '' != $q[$t->query_var] ) {
+						$terms = get_terms($taxonomy, array('slug'=>$q[$t->query_var]));
+						if ( !is_wp_error($terms) )
+							break;
+					}
+				}
+			}
+			if ( is_wp_error($terms) || empty($terms) ) {
+				$whichcat = " AND 0 ";
+			} else {
+				foreach ( $terms as $term )
+					$term_ids[] = $term->term_id;
+				$post_ids = get_objects_in_term($term_ids, $taxonomy);
+				if ( !is_wp_error($post_ids) && count($post_ids) ) {
+					$whichcat .= " AND $wpdb->posts.ID IN (" . implode(', ', $post_ids) . ") ";
+					$post_type = 'any';
+					$q['post_status'] = 'publish';
+					$post_status_join = true;
+				} else {
+					$whichcat = " AND 0 ";
+				}
+			}
+		}
+
 		// Author/user stuff
 
 		if ( empty($q['author']) || ($q['author'] == '0') ) {
@@ -1081,15 +1979,15 @@ class WP_Query {
 				$eq = '!=';
 				$andor = 'AND';
 				$q['author'] = explode('-', $q['author']);
-				$q['author'] = ''.intval($q['author'][1]);
+				$q['author'] = '' . absint($q['author'][1]);
 			} else {
 				$eq = '=';
 				$andor = 'OR';
 			}
 			$author_array = preg_split('/[,\s]+/', $q['author']);
-			$whichauthor .= ' AND (post_author '.$eq.' '.intval($author_array[0]);
+			$whichauthor .= " AND ($wpdb->posts.post_author ".$eq.' '.absint($author_array[0]);
 			for ($i = 1; $i < (count($author_array)); $i = $i + 1) {
-				$whichauthor .= ' '.$andor.' post_author '.$eq.' '.intval($author_array[$i]);
+				$whichauthor .= ' '.$andor." $wpdb->posts.post_author ".$eq.' '.absint($author_array[$i]);
 			}
 			$whichauthor .= ')';
 		}
@@ -1107,20 +2005,34 @@ class WP_Query {
 			}
 			$q['author_name'] = sanitize_title($q['author_name']);
 			$q['author'] = $wpdb->get_var("SELECT ID FROM $wpdb->users WHERE user_nicename='".$q['author_name']."'");
-			$whichauthor .= ' AND (post_author = '.intval($q['author']).')';
+			$q['author'] = get_user_by('slug', $q['author_name']);
+			if ( $q['author'] )
+				$q['author'] = $q['author']->ID;
+			$whichauthor .= " AND ($wpdb->posts.post_author = ".absint($q['author']).')';
 		}
 
-		$where .= $search.$whichcat.$whichauthor;
+		// MIME-Type stuff for attachment browsing
+
+		if ( isset($q['post_mime_type']) && '' != $q['post_mime_type'] )
+			$whichmimetype = wp_post_mime_type_where($q['post_mime_type']);
+
+		$where .= $search.$whichcat.$whichauthor.$whichmimetype;
 
 		if ( empty($q['order']) || ((strtoupper($q['order']) != 'ASC') && (strtoupper($q['order']) != 'DESC')) )
 			$q['order'] = 'DESC';
 
 		// Order by
 		if ( empty($q['orderby']) ) {
-			$q['orderby'] = 'post_date '.$q['order'];
+			$q['orderby'] = "$wpdb->posts.post_date ".$q['order'];
+		} elseif ( 'none' == $q['orderby'] ) {
+			$q['orderby'] = '';
 		} else {
 			// Used to filter values
-			$allowed_keys = array('author', 'date', 'category', 'title', 'modified', 'menu_order');
+			$allowed_keys = array('author', 'date', 'title', 'modified', 'menu_order', 'parent', 'ID', 'rand');
+			if ( !empty($q['meta_key']) ) {
+				$allowed_keys[] = $q['meta_key'];
+				$allowed_keys[] = 'meta_value';
+			}
 			$q['orderby'] = urldecode($q['orderby']);
 			$q['orderby'] = addslashes_gpc($q['orderby']);
 			$orderby_array = explode(' ',$q['orderby']);
@@ -1130,73 +2042,132 @@ class WP_Query {
 			for ($i = 0; $i < count($orderby_array); $i++) {
 				// Only allow certain values for safety
 				$orderby = $orderby_array[$i];
-				if ( 'menu_order' != $orderby )
-					$orderby = 'post_' . $orderby;
+				switch ($orderby) {
+					case 'menu_order':
+						break;
+					case 'ID':
+						$orderby = "$wpdb->posts.ID";
+						break;
+					case 'rand':
+						$orderby = 'RAND()';
+						break;
+					case $q['meta_key']:
+					case 'meta_value':
+						$orderby = "$wpdb->postmeta.meta_value";
+						break;
+					default:
+						$orderby = "$wpdb->posts.post_" . $orderby;
+				}
 				if ( in_array($orderby_array[$i], $allowed_keys) )
-					$q['orderby'] .= (($i == 0) ? '' : ',') . "$orderby {$q['order']}";
+					$q['orderby'] .= (($i == 0) ? '' : ',') . $orderby;
 			}
+			// append ASC or DESC at the end
+			if ( !empty($q['orderby']))
+				$q['orderby'] .= " {$q['order']}";
+
 			if ( empty($q['orderby']) )
-				$q['orderby'] = 'post_date '.$q['order'];
+				$q['orderby'] = "$wpdb->posts.post_date ".$q['order'];
 		}
 
-		if ( $this->is_attachment ) {
-			$where .= " AND post_type = 'attachment'";
+		if ( 'any' == $post_type ) {
+			$where .= " AND $wpdb->posts.post_type != 'revision'";
+		} elseif ( $this->is_attachment ) {
+			$where .= " AND $wpdb->posts.post_type = 'attachment'";
 		} elseif ($this->is_page) {
-			$where .= " AND post_type = 'page'";
+			$where .= " AND $wpdb->posts.post_type = 'page'";
 		} elseif ($this->is_single) {
-			$where .= " AND post_type = 'post'";
+			$where .= " AND $wpdb->posts.post_type = 'post'";
 		} else {
-			$where .= " AND post_type = '$post_type'";
+			$where .= " AND $wpdb->posts.post_type = '$post_type'";
 		}
 
 		if ( isset($q['post_status']) && '' != $q['post_status'] ) {
+			$statuswheres = array();
 			$q_status = explode(',', $q['post_status']);
 			$r_status = array();
+			$p_status = array();
 			if ( in_array( 'draft'  , $q_status ) )
-				$r_status[] = "post_status = 'draft'";
+				$r_status[] = "$wpdb->posts.post_status = 'draft'";
 			if ( in_array( 'pending', $q_status ) )
-				$r_status[] = "post_status = 'pending'";
+				$r_status[] = "$wpdb->posts.post_status = 'pending'";
 			if ( in_array( 'future' , $q_status ) )
-				$r_status[] = "post_status = 'future'";
+				$r_status[] = "$wpdb->posts.post_status = 'future'";
 			if ( in_array( 'inherit' , $q_status ) )
-				$r_status[] = "post_status = 'inherit'";
+				$r_status[] = "$wpdb->posts.post_status = 'inherit'";
 			if ( in_array( 'private', $q_status ) )
-				$r_status[] = "post_status = 'private'";
+				$p_status[] = "$wpdb->posts.post_status = 'private'";
 			if ( in_array( 'publish', $q_status ) )
-				$r_status[] = "post_status = 'publish'";
-			if ( !empty($r_status) )
-				$where .= " AND (" . join( ' OR ', $r_status ) . ")";
+				$r_status[] = "$wpdb->posts.post_status = 'publish'";
+
+			if ( empty($q['perm'] ) || 'readable' != $q['perm'] ) {
+				$r_status = array_merge($r_status, $p_status);
+				unset($p_status);
+			}
+
+			if ( !empty($r_status) ) {
+				if ( !empty($q['perm'] ) && 'editable' == $q['perm'] && !current_user_can("edit_others_{$post_type}s") )
+					$statuswheres[] = "($wpdb->posts.post_author = $user_ID " .  "AND (" . join( ' OR ', $r_status ) . "))";
+				else
+					$statuswheres[] = "(" . join( ' OR ', $r_status ) . ")";
+			}
+			if ( !empty($p_status) ) {
+				if ( !empty($q['perm'] ) && 'readable' == $q['perm'] && !current_user_can("read_private_{$post_type}s") )
+					$statuswheres[] = "($wpdb->posts.post_author = $user_ID " .  "AND (" . join( ' OR ', $p_status ) . "))";
+				else
+					$statuswheres[] = "(" . join( ' OR ', $p_status ) . ")";
+			}
+			if ( $post_status_join ) {
+				$join .= " LEFT JOIN $wpdb->posts AS p2 ON ($wpdb->posts.post_parent = p2.ID) ";
+				foreach ( $statuswheres as $index => $statuswhere )
+					$statuswheres[$index] = "($statuswhere OR ($wpdb->posts.post_status = 'inherit' AND " . str_replace($wpdb->posts, 'p2', $statuswhere) . "))";
+			}
+			foreach ( $statuswheres as $statuswhere )
+				$where .= " AND $statuswhere";
 		} elseif ( !$this->is_singular ) {
-			$where .= " AND (post_status = 'publish'";
+			$where .= " AND ($wpdb->posts.post_status = 'publish'";
 
 			if ( is_admin() )
-				$where .= " OR post_status = 'future' OR post_status = 'draft' OR post_status = 'pending'";
+				$where .= " OR $wpdb->posts.post_status = 'future' OR $wpdb->posts.post_status = 'draft' OR $wpdb->posts.post_status = 'pending'";
 
 			if ( is_user_logged_in() ) {
-				$where .= current_user_can( "read_private_{$post_type}s" ) ? " OR post_status = 'private'" : " OR post_author = $user_ID AND post_status = 'private'";
+				$where .= current_user_can( "read_private_{$post_type}s" ) ? " OR $wpdb->posts.post_status = 'private'" : " OR $wpdb->posts.post_author = $user_ID AND $wpdb->posts.post_status = 'private'";
 			}
 
 			$where .= ')';
 		}
 
+		// postmeta queries
+		if ( ! empty($q['meta_key']) || ! empty($q['meta_value']) )
+			$join .= " JOIN $wpdb->postmeta ON ($wpdb->posts.ID = $wpdb->postmeta.post_id) ";
+		if ( ! empty($q['meta_key']) )
+			$where .= $wpdb->prepare(" AND $wpdb->postmeta.meta_key = %s ", $q['meta_key']);
+		if ( ! empty($q['meta_value']) ) {
+			if ( ! isset($q['meta_compare']) || empty($q['meta_compare']) || ! in_array($q['meta_compare'], array('=', '!=', '>', '>=', '<', '<=')) )
+				$q['meta_compare'] = '=';
+
+			$where .= $wpdb->prepare("AND $wpdb->postmeta.meta_value {$q['meta_compare']} %s ", $q['meta_value']);
+		}
+
 		// Apply filters on where and join prior to paging so that any
 		// manipulations to them are reflected in the paging by day queries.
-		$where = apply_filters('posts_where', $where);
-		$join = apply_filters('posts_join', $join);
+		if ( !$q['suppress_filters'] ) {
+			$where = apply_filters('posts_where', $where);
+			$join = apply_filters('posts_join', $join);
+		}
 
 		// Paging
 		if ( empty($q['nopaging']) && !$this->is_singular ) {
-			$page = abs(intval($q['paged']));
+			$page = absint($q['paged']);
 			if (empty($page)) {
 				$page = 1;
 			}
 
 			if ( empty($q['offset']) ) {
 				$pgstrt = '';
-				$pgstrt = (intval($page) -1) * $q['posts_per_page'] . ', ';
+				$pgstrt = ($page - 1) * $q['posts_per_page'] . ', ';
 				$limits = 'LIMIT '.$pgstrt.$q['posts_per_page'];
 			} else { // we're ignoring $page and using 'offset'
-				$q['offset'] = abs(intval($q['offset']));
+				$q['offset'] = absint($q['offset']);
 				$pgstrt = $q['offset'] . ', ';
 				$limits = 'LIMIT ' . $pgstrt . $q['posts_per_page'];
 			}
@@ -1205,20 +2176,26 @@ class WP_Query {
 		// Comments feeds
 		if ( $this->is_comment_feed && ( $this->is_archive || $this->is_search || !$this->is_singular ) ) {
 			if ( $this->is_archive || $this->is_search ) {
-				$cjoin = "LEFT JOIN $wpdb->posts ON ($wpdb->comments.comment_post_ID = $wpdb->posts.ID) $join ";
+				$cjoin = "JOIN $wpdb->posts ON ($wpdb->comments.comment_post_ID = $wpdb->posts.ID) $join ";
 				$cwhere = "WHERE comment_approved = '1' $where";
-				$cgroupby = "GROUP BY $wpdb->comments.comment_id";
+				$cgroupby = "$wpdb->comments.comment_id";
 			} else { // Other non singular e.g. front
-				$cjoin = "LEFT JOIN $wpdb->posts ON ( $wpdb->comments.comment_post_ID = $wpdb->posts.ID )";
+				$cjoin = "JOIN $wpdb->posts ON ( $wpdb->comments.comment_post_ID = $wpdb->posts.ID )";
 				$cwhere = "WHERE post_status = 'publish' AND comment_approved = '1'";
 				$cgroupby = '';
 			}
 
-			$cjoin = apply_filters('comment_feed_join', $cjoin);
-			$cwhere = apply_filters('comment_feed_where', $cwhere);
-			$cgroupby = apply_filters('comment_feed_groupby', $cgroupby);
+			if ( !$q['suppress_filters'] ) {
+				$cjoin = apply_filters('comment_feed_join', $cjoin);
+				$cwhere = apply_filters('comment_feed_where', $cwhere);
+				$cgroupby = apply_filters('comment_feed_groupby', $cgroupby);
+				$corderby = apply_filters('comment_feed_orderby', 'comment_date_gmt DESC');
+				$climits = apply_filters('comment_feed_limits', 'LIMIT ' . get_option('posts_per_rss'));
+			}
+			$cgroupby = ( ! empty( $cgroupby ) ) ? 'GROUP BY ' . $cgroupby : '';
+			$corderby = ( ! empty( $corderby ) ) ? 'ORDER BY ' . $corderby : '';
 
-			$this->comments = (array) $wpdb->get_results("SELECT $distinct $wpdb->comments.* FROM $wpdb->comments $cjoin $cwhere $cgroupby ORDER BY comment_date_gmt DESC LIMIT " . get_option('posts_per_rss'));
+			$this->comments = (array) $wpdb->get_results("SELECT $distinct $wpdb->comments.* FROM $wpdb->comments $cjoin $cwhere $cgroupby $corderby $climits");
 			$this->comment_count = count($this->comments);
 
 			$post_ids = array();
@@ -1234,38 +2211,61 @@ class WP_Query {
 				$where = "AND 0";
 		}
 
+		$orderby = $q['orderby'];
+
 		// Apply post-paging filters on where and join.  Only plugins that
 		// manipulate paging queries should use these hooks.
+		if ( !$q['suppress_filters'] ) {
+			$where = apply_filters('posts_where_paged', $where);
+			$groupby = apply_filters('posts_groupby', $groupby);
+			$join = apply_filters('posts_join_paged', $join);
+			$orderby = apply_filters('posts_orderby', $orderby);
+			$distinct = apply_filters('posts_distinct', $distinct);
+			$limits = apply_filters( 'post_limits', $limits );
+
+			$fields = apply_filters('posts_fields', $fields);
+		}
 
 		// Announce current selection parameters.  For use by caching plugins.
-		do_action( 'posts_selection', $where . $groupby . $q['orderby'] . $limits . $join );
+		do_action( 'posts_selection', $where . $groupby . $orderby . $limits . $join );
+
+		// Filter again for the benefit of caching plugins.  Regular plugins should use the hooks above.
+		if ( !$q['suppress_filters'] ) {
+			$where = apply_filters('posts_where_request', $where);
+			$groupby = apply_filters('posts_groupby_request', $groupby);
+			$join = apply_filters('posts_join_request', $join);
+			$orderby = apply_filters('posts_orderby_request', $orderby);
+			$distinct = apply_filters('posts_distinct_request', $distinct);
+			$fields = apply_filters('posts_fields_request', $fields);
+			$limits = apply_filters( 'post_limits_request', $limits );
+		}
 
-		$where = apply_filters('posts_where_paged', $where);
-		$groupby = apply_filters('posts_groupby', $groupby);
 		if ( ! empty($groupby) )
 			$groupby = 'GROUP BY ' . $groupby;
-		$join = apply_filters('posts_join_paged', $join);
-		$orderby = apply_filters('posts_orderby', $q['orderby']);
 		if ( !empty( $orderby ) )
 			$orderby = 'ORDER BY ' . $orderby;
-		$distinct = apply_filters('posts_distinct', $distinct);
-		$fields = apply_filters('posts_fields', "$wpdb->posts.*");
-		$limits = apply_filters( 'post_limits', $limits );
 		$found_rows = '';
 		if ( !empty($limits) )
 			$found_rows = 'SQL_CALC_FOUND_ROWS';
 
-		$request = " SELECT $found_rows $distinct $fields FROM $wpdb->posts $join WHERE 1=1 $where $groupby $orderby $limits";
-		$this->request = apply_filters('posts_request', $request);
+		$this->request = " SELECT $found_rows $distinct $fields FROM $wpdb->posts $join WHERE 1=1 $where $groupby $orderby $limits";
+		if ( !$q['suppress_filters'] )
+			$this->request = apply_filters('posts_request', $this->request);
 
 		$this->posts = $wpdb->get_results($this->request);
 		// Raw results filter.  Prior to status checks.
-		$this->posts = apply_filters('posts_results', $this->posts);
+		if ( !$q['suppress_filters'] )
+			$this->posts = apply_filters('posts_results', $this->posts);
 
-		if ( $this->is_comment_feed && $this->is_singular ) {
+		if ( !empty($this->posts) && $this->is_comment_feed && $this->is_singular ) {
 			$cjoin = apply_filters('comment_feed_join', '');
-			$cwhere = apply_filters('comment_feed_where', "WHERE comment_post_ID = {$this->posts[0]->ID} AND comment_approved = '1'");
-			$comments_request = "SELECT $wpdb->comments.* FROM $wpdb->comments $cjoin $cwhere ORDER BY comment_date_gmt DESC LIMIT " . get_option('posts_per_rss');
+			$cwhere = apply_filters('comment_feed_where', "WHERE comment_post_ID = '{$this->posts[0]->ID}' AND comment_approved = '1'");
+			$cgroupby = apply_filters('comment_feed_groupby', '');
+			$cgroupby = ( ! empty( $cgroupby ) ) ? 'GROUP BY ' . $cgroupby : '';
+			$corderby = apply_filters('comment_feed_orderby', 'comment_date_gmt DESC');
+			$corderby = ( ! empty( $corderby ) ) ? 'ORDER BY ' . $corderby : '';
+			$climits = apply_filters('comment_feed_limits', 'LIMIT ' . get_option('posts_per_rss'));
+			$comments_request = "SELECT $wpdb->comments.* FROM $wpdb->comments $cjoin $cwhere $cgroupby $corderby $climits";
 			$this->comments = $wpdb->get_results($comments_request);
 			$this->comment_count = count($this->comments);
 		}
@@ -1305,9 +2305,48 @@ class WP_Query {
 					}
 				}
 			}
+
+			if ( $this->is_preview && current_user_can( "edit_{$post_type}", $this->posts[0]->ID ) )
+				$this->posts[0] = apply_filters('the_preview', $this->posts[0]);
+		}
+
+		// Put sticky posts at the top of the posts array
+		$sticky_posts = get_option('sticky_posts');
+		if ( $this->is_home && $page <= 1 && is_array($sticky_posts) && !empty($sticky_posts) && !$q['caller_get_posts'] ) {
+			$num_posts = count($this->posts);
+			$sticky_offset = 0;
+			// Loop over posts and relocate stickies to the front.
+			for ( $i = 0; $i < $num_posts; $i++ ) {
+				if ( in_array($this->posts[$i]->ID, $sticky_posts) ) {
+					$sticky_post = $this->posts[$i];
+					// Remove sticky from current position
+					array_splice($this->posts, $i, 1);
+					// Move to front, after other stickies
+					array_splice($this->posts, $sticky_offset, 0, array($sticky_post));
+					// Increment the sticky offset.  The next sticky will be placed at this offset.
+					$sticky_offset++;
+					// Remove post from sticky posts array
+					$offset = array_search($sticky_post->ID, $sticky_posts);
+					array_splice($sticky_posts, $offset, 1);
+				}
+			}
+
+			// Fetch sticky posts that weren't in the query results
+			if ( !empty($sticky_posts) ) {
+				$stickies__in = implode(',', array_map( 'absint', $sticky_posts ));
+				$stickies = $wpdb->get_results( "SELECT * FROM $wpdb->posts WHERE $wpdb->posts.ID IN ($stickies__in)" );
+				/** @todo Make sure post is published or viewable by the current user */
+				foreach ( $stickies as $sticky_post ) {
+					if ( 'publish' != $sticky_post->post_status )
+						continue;
+						array_splice($this->posts, $sticky_offset, 0, array($sticky_post));
+						$sticky_offset++;
+				}
+			}
 		}
 
-		$this->posts = apply_filters('the_posts', $this->posts);
+		if ( !$q['suppress_filters'] )
+			$this->posts = apply_filters('the_posts', $this->posts);
 
 		update_post_caches($this->posts);
 
@@ -1319,6 +2358,14 @@ class WP_Query {
 		return $this->posts;
 	}
 
+	/**
+	 * Setup the next post and iterate current post index.
+	 *
+	 * @since 1.5.0
+	 * @access public
+	 *
+	 * @return object Next post.
+	 */
 	function next_post() {
 
 		$this->current_post++;
@@ -1327,21 +2374,44 @@ class WP_Query {
 		return $this->post;
 	}
 
+	/**
+	 * Sets up the current post.
+	 *
+	 * Retrieves the next post, sets up the post, sets the 'in the loop'
+	 * property to true.
+	 *
+	 * @since 1.5.0
+	 * @access public
+	 * @uses $post
+	 * @uses do_action_ref_array() Calls 'loop_start' if loop has just started
+	 */
 	function the_post() {
 		global $post;
 		$this->in_the_loop = true;
+
+		if ( $this->current_post == -1 ) // loop has just started
+			do_action_ref_array('loop_start', array(&$this));
+
 		$post = $this->next_post();
 		setup_postdata($post);
-
-		if ( $this->current_post == 0 ) // loop has just started
-			do_action('loop_start');
 	}
 
+	/**
+	 * Whether there are more posts available in the loop.
+	 *
+	 * Calls action 'loop_end', when the loop is complete.
+	 *
+	 * @since 1.5.0
+	 * @access public
+	 * @uses do_action_ref_array() Calls 'loop_end' if loop is ended
+	 *
+	 * @return bool True if posts are available, false if end of loop.
+	 */
 	function have_posts() {
 		if ($this->current_post + 1 < $this->post_count) {
 			return true;
-		} elseif ($this->current_post + 1 == $this->post_count) {
-			do_action('loop_end');
+		} elseif ($this->current_post + 1 == $this->post_count && $this->post_count > 0) {
+			do_action_ref_array('loop_end', array(&$this));
 			// Do some cleaning up after the loop
 			$this->rewind_posts();
 		}
@@ -1350,6 +2420,12 @@ class WP_Query {
 		return false;
 	}
 
+	/**
+	 * Rewind the posts and reset post index.
+	 *
+	 * @since 1.5.0
+	 * @access public
+	 */
 	function rewind_posts() {
 		$this->current_post = -1;
 		if ($this->post_count > 0) {
@@ -1357,6 +2433,14 @@ class WP_Query {
 		}
 	}
 
+	/**
+	 * Iterate current comment index and return comment object.
+	 *
+	 * @since 2.2.0
+	 * @access public
+	 *
+	 * @return object Comment object.
+	 */
 	function next_comment() {
 		$this->current_comment++;
 
@@ -1364,6 +2448,14 @@ class WP_Query {
 		return $this->comment;
 	}
 
+	/**
+	 * Sets up the current comment.
+	 *
+	 * @since 2.2.0
+	 * @access public
+	 * @global object $comment Current comment.
+	 * @uses do_action() Calls 'comment_loop_start' hook when first comment is processed.
+	 */
 	function the_comment() {
 		global $comment;
 
@@ -1374,6 +2466,16 @@ class WP_Query {
 		}
 	}
 
+	/**
+	 * Whether there are more comments available.
+	 *
+	 * Automatically rewinds comments when finished.
+	 *
+	 * @since 2.2.0
+	 * @access public
+	 *
+	 * @return bool True, if more comments. False, if no more posts.
+	 */
 	function have_comments() {
 		if ($this->current_comment + 1 < $this->comment_count) {
 			return true;
@@ -1384,6 +2486,12 @@ class WP_Query {
 		return false;
 	}
 
+	/**
+	 * Rewind the comments, resets the comment index and comment to first.
+	 *
+	 * @since 2.2.0
+	 * @access public
+	 */
 	function rewind_comments() {
 		$this->current_comment = -1;
 		if ($this->comment_count > 0) {
@@ -1391,11 +2499,32 @@ class WP_Query {
 		}
 	}
 
+	/**
+	 * Sets up the WordPress query by parsing query string.
+	 *
+	 * @since 1.5.0
+	 * @access public
+	 *
+	 * @param string $query URL query string.
+	 * @return array List of posts.
+	 */
 	function &query($query) {
 		$this->parse_query($query);
 		return $this->get_posts();
 	}
 
+	/**
+	 * Retrieve queried object.
+	 *
+	 * If queried object is not set, then the queried object will be set from
+	 * the category, tag, taxonomy, posts page, single post, page, or author
+	 * query variable. After it is set up, it will be returned.
+	 *
+	 * @since 1.5.0
+	 * @access public
+	 *
+	 * @return object
+	 */
 	function get_queried_object() {
 		if (isset($this->queried_object)) {
 			return $this->queried_object;
@@ -1407,15 +2536,26 @@ class WP_Query {
 		if ($this->is_category) {
 			$cat = $this->get('cat');
 			$category = &get_category($cat);
+			if ( is_wp_error( $category ) )
+				return NULL;
 			$this->queried_object = &$category;
 			$this->queried_object_id = (int) $cat;
 		} else if ($this->is_tag) {
 			$tag_id = $this->get('tag_id');
 			$tag = &get_term($tag_id, 'post_tag');
 			if ( is_wp_error( $tag ) )
-				return $tag;
+				return NULL;
 			$this->queried_object = &$tag;
 			$this->queried_object_id = (int) $tag_id;
+		} else if ($this->is_tax) {
+			$tax = $this->get('taxonomy');
+			$slug = $this->get('term');
+			$term = &get_terms($tax, array('slug'=>$slug));
+			if ( is_wp_error($term) || empty($term) )
+				return NULL;
+			$term = $term[0];
+			$this->queried_object = $term;
+			$this->queried_object_id = $term->term_id;
 		} else if ($this->is_posts_page) {
 			$this->queried_object = & get_page(get_option('page_for_posts'));
 			$this->queried_object_id = (int) $this->queried_object->ID;
@@ -1435,6 +2575,14 @@ class WP_Query {
 		return $this->queried_object;
 	}
 
+	/**
+	 * Retrieve ID of the current queried object.
+	 *
+	 * @since 1.5.0
+	 * @access public
+	 *
+	 * @return int
+	 */
 	function get_queried_object_id() {
 		$this->get_queried_object();
 
@@ -1445,6 +2593,17 @@ class WP_Query {
 		return 0;
 	}
 
+	/**
+	 * PHP4 type constructor.
+	 *
+	 * Sets up the WordPress query, if parameter is not empty.
+	 *
+	 * @since 1.5.0
+	 * @access public
+	 *
+	 * @param string $query URL query string.
+	 * @return WP_Query
+	 */
 	function WP_Query ($query = '') {
 		if (! empty($query)) {
 			$this->query($query);
@@ -1452,8 +2611,17 @@ class WP_Query {
 	}
 }
 
-
-// Redirect old slugs
+/**
+ * Redirect old slugs to the correct permalink.
+ *
+ * Attempts to find the current slug from the past slugs.
+ *
+ * @since 2.1.0
+ * @uses $wp_query
+ * @uses $wpdb
+ *
+ * @return null If no link is found, null is returned.
+ */
 function wp_old_slug_redirect () {
 	global $wp_query;
 	if ( is_404() && '' != $wp_query->query_vars['name'] ) :
@@ -1485,30 +2653,32 @@ function wp_old_slug_redirect () {
 	endif;
 }
 
-
-//
-// Private helper functions
-//
-
-// Setup global post data.
+/**
+ * Setup global post data.
+ *
+ * @since 1.5.0
+ *
+ * @param object $post Post data.
+ * @uses do_action_ref_array() Calls 'the_post'
+ * @return bool True when finished.
+ */
 function setup_postdata($post) {
-	global $id, $postdata, $authordata, $day, $currentmonth, $page, $pages, $multipage, $more, $numpages, $wp_query;
-	global $pagenow;
+	global $id, $authordata, $day, $currentmonth, $page, $pages, $multipage, $more, $numpages;
 
 	$id = (int) $post->ID;
 
 	$authordata = get_userdata($post->post_author);
 
-	$day = mysql2date('d.m.y', $post->post_date);
-	$currentmonth = mysql2date('m', $post->post_date);
+	$day = mysql2date('d.m.y', $post->post_date, false);
+	$currentmonth = mysql2date('m', $post->post_date, false);
 	$numpages = 1;
 	$page = get_query_var('page');
 	if ( !$page )
 		$page = 1;
-	if ( is_single() || is_page() )
+	if ( is_single() || is_page() || is_feed() )
 		$more = 1;
 	$content = $post->post_content;
-	if ( preg_match('/<!--nextpage-->/', $content) ) {
+	if ( strpos( $content, '<!--nextpage-->' ) ) {
 		if ( $page > 1 )
 			$more = 1;
 		$multipage = 1;
@@ -1521,6 +2691,9 @@ function setup_postdata($post) {
 		$pages[0] = $post->post_content;
 		$multipage = 0;
 	}
+
+	do_action_ref_array('the_post', array(&$post));
+	
 	return true;
 }