3 * Category Template Tags and API.
10 * Retrieve category link URL.
13 * @see get_term_link()
15 * @param int|object $category Category ID or object.
16 * @return string Link on success, empty string if category does not exist.
18 function get_category_link( $category ) {
19 if ( ! is_object( $category ) )
20 $category = (int) $category;
22 $category = get_term_link( $category, 'category' );
24 if ( is_wp_error( $category ) )
31 * Retrieve category parents with separator.
35 * @param int $id Category ID.
36 * @param bool $link Optional, default is false. Whether to format with link.
37 * @param string $separator Optional, default is '/'. How to separate categories.
38 * @param bool $nicename Optional, default is false. Whether to use nice name for display.
39 * @param array $visited Optional. Already linked to categories to prevent duplicates.
40 * @return string|WP_Error A list of category parents on success, WP_Error on failure.
42 function get_category_parents( $id, $link = false, $separator = '/', $nicename = false, $visited = array() ) {
44 $parent = get_term( $id, 'category' );
45 if ( is_wp_error( $parent ) )
49 $name = $parent->slug;
51 $name = $parent->name;
53 if ( $parent->parent && ( $parent->parent != $parent->term_id ) && !in_array( $parent->parent, $visited ) ) {
54 $visited[] = $parent->parent;
55 $chain .= get_category_parents( $parent->parent, $link, $separator, $nicename, $visited );
59 $chain .= '<a href="' . esc_url( get_category_link( $parent->term_id ) ) . '" title="' . esc_attr( sprintf( __( "View all posts in %s" ), $parent->name ) ) . '">'.$name.'</a>' . $separator;
61 $chain .= $name.$separator;
66 * Retrieve post categories.
71 * @param int $id Optional, default to current post ID. The post ID.
74 function get_the_category( $id = false ) {
75 $categories = get_the_terms( $id, 'category' );
76 if ( ! $categories || is_wp_error( $categories ) )
77 $categories = array();
79 $categories = array_values( $categories );
81 foreach ( array_keys( $categories ) as $key ) {
82 _make_cat_compat( $categories[$key] );
86 * Filter the array of categories to return for a post.
90 * @param array $categories An array of categories to return for the post.
92 return apply_filters( 'get_the_categories', $categories );
96 * Sort categories by name.
98 * Used by usort() as a callback, should not be used directly. Can actually be
99 * used to sort any term object.
108 function _usort_terms_by_name( $a, $b ) {
109 return strcmp( $a->name, $b->name );
113 * Sort categories by ID.
115 * Used by usort() as a callback, should not be used directly. Can actually be
116 * used to sort any term object.
125 function _usort_terms_by_ID( $a, $b ) {
126 if ( $a->term_id > $b->term_id )
128 elseif ( $a->term_id < $b->term_id )
135 * Retrieve category name based on category ID.
139 * @param int $cat_ID Category ID.
140 * @return string|WP_Error Category name on success, WP_Error on failure.
142 function get_the_category_by_ID( $cat_ID ) {
143 $cat_ID = (int) $cat_ID;
144 $category = get_term( $cat_ID, 'category' );
146 if ( is_wp_error( $category ) )
149 return ( $category ) ? $category->name : '';
153 * Retrieve category list in either HTML list or custom format.
157 * @param string $separator Optional, default is empty string. Separator for between the categories.
158 * @param string $parents Optional. How to display the parents.
159 * @param int $post_id Optional. Post ID to retrieve categories.
162 function get_the_category_list( $separator = '', $parents='', $post_id = false ) {
164 if ( ! is_object_in_taxonomy( get_post_type( $post_id ), 'category' ) ) {
165 /** This filter is documented in wp-includes/category-template.php */
166 return apply_filters( 'the_category', '', $separator, $parents );
169 $categories = get_the_category( $post_id );
170 if ( empty( $categories ) ) {
171 /** This filter is documented in wp-includes/category-template.php */
172 return apply_filters( 'the_category', __( 'Uncategorized' ), $separator, $parents );
175 $rel = ( is_object( $wp_rewrite ) && $wp_rewrite->using_permalinks() ) ? 'rel="category tag"' : 'rel="category"';
178 if ( '' == $separator ) {
179 $thelist .= '<ul class="post-categories">';
180 foreach ( $categories as $category ) {
181 $thelist .= "\n\t<li>";
182 switch ( strtolower( $parents ) ) {
184 if ( $category->parent )
185 $thelist .= get_category_parents( $category->parent, true, $separator );
186 $thelist .= '<a href="' . esc_url( get_category_link( $category->term_id ) ) . '" title="' . esc_attr( sprintf( __( "View all posts in %s" ), $category->name ) ) . '" ' . $rel . '>' . $category->name.'</a></li>';
189 $thelist .= '<a href="' . esc_url( get_category_link( $category->term_id ) ) . '" title="' . esc_attr( sprintf( __( "View all posts in %s" ), $category->name ) ) . '" ' . $rel . '>';
190 if ( $category->parent )
191 $thelist .= get_category_parents( $category->parent, false, $separator );
192 $thelist .= $category->name.'</a></li>';
196 $thelist .= '<a href="' . esc_url( get_category_link( $category->term_id ) ) . '" title="' . esc_attr( sprintf( __( "View all posts in %s" ), $category->name ) ) . '" ' . $rel . '>' . $category->name.'</a></li>';
202 foreach ( $categories as $category ) {
204 $thelist .= $separator;
205 switch ( strtolower( $parents ) ) {
207 if ( $category->parent )
208 $thelist .= get_category_parents( $category->parent, true, $separator );
209 $thelist .= '<a href="' . esc_url( get_category_link( $category->term_id ) ) . '" title="' . esc_attr( sprintf( __( "View all posts in %s" ), $category->name ) ) . '" ' . $rel . '>' . $category->name.'</a>';
212 $thelist .= '<a href="' . esc_url( get_category_link( $category->term_id ) ) . '" title="' . esc_attr( sprintf( __( "View all posts in %s" ), $category->name ) ) . '" ' . $rel . '>';
213 if ( $category->parent )
214 $thelist .= get_category_parents( $category->parent, false, $separator );
215 $thelist .= "$category->name</a>";
219 $thelist .= '<a href="' . esc_url( get_category_link( $category->term_id ) ) . '" title="' . esc_attr( sprintf( __( "View all posts in %s" ), $category->name ) ) . '" ' . $rel . '>' . $category->name.'</a>';
226 * Filter the category or list of categories.
230 * @param array $thelist List of categories for the current post.
231 * @param string $separator Separator used between the categories.
232 * @param string $parents How to display the category parents. Accepts 'multiple',
233 * 'single', or empty.
235 return apply_filters( 'the_category', $thelist, $separator, $parents );
239 * Check if the current post in within any of the given categories.
241 * The given categories are checked against the post's categories' term_ids, names and slugs.
242 * Categories given as integers will only be checked against the post's categories' term_ids.
244 * Prior to v2.5 of WordPress, category names were not supported.
245 * Prior to v2.7, category slugs were not supported.
246 * Prior to v2.7, only one category could be compared: in_category( $single_category ).
247 * Prior to v2.7, this function could only be used in the WordPress Loop.
248 * As of 2.7, the function can be used anywhere if it is provided a post ID or post object.
251 * @uses has_category()
253 * @param int|string|array $category Category ID, name or slug, or array of said.
254 * @param int|object $post Optional. Post to check instead of the current post. (since 2.7.0)
255 * @return bool True if the current post is in any of the given categories.
257 function in_category( $category, $post = null ) {
258 if ( empty( $category ) )
261 return has_category( $category, $post );
265 * Display the category list for the post.
269 * @param string $separator Optional, default is empty string. Separator for between the categories.
270 * @param string $parents Optional. How to display the parents.
271 * @param int $post_id Optional. Post ID to retrieve categories.
273 function the_category( $separator = '', $parents='', $post_id = false ) {
274 echo get_the_category_list( $separator, $parents, $post_id );
278 * Retrieve category description.
282 * @param int $category Optional. Category ID. Will use global category ID by default.
283 * @return string Category description, available.
285 function category_description( $category = 0 ) {
286 return term_description( $category, 'category' );
290 * Display or retrieve the HTML dropdown list of categories.
292 * The list of arguments is below:
293 * 'show_option_all' (string) - Text to display for showing all categories.
294 * 'show_option_none' (string) - Text to display for showing no categories.
295 * 'orderby' (string) default is 'ID' - What column to use for ordering the
297 * 'order' (string) default is 'ASC' - What direction to order categories.
298 * 'show_count' (bool|int) default is 0 - Whether to show how many posts are
300 * 'hide_empty' (bool|int) default is 1 - Whether to hide categories that
301 * don't have any posts attached to them.
302 * 'child_of' (int) default is 0 - See {@link get_categories()}.
303 * 'exclude' (string) - See {@link get_categories()}.
304 * 'echo' (bool|int) default is 1 - Whether to display or retrieve content.
305 * 'depth' (int) - The max depth.
306 * 'tab_index' (int) - Tab index for select element.
307 * 'name' (string) - The name attribute value for select element.
308 * 'id' (string) - The ID attribute value for select element. Defaults to name if omitted.
309 * 'class' (string) - The class attribute value for select element.
310 * 'selected' (int) - Which category ID is selected.
311 * 'taxonomy' (string) - The name of the taxonomy to retrieve. Defaults to category.
313 * The 'hierarchical' argument, which is disabled by default, will override the
314 * depth argument, unless it is true. When the argument is false, it will
315 * display all of the categories. When it is enabled it will use the value in
316 * the 'depth' argument.
320 * @param string|array $args Optional. Override default arguments.
321 * @return string HTML content only if 'echo' argument is 0.
323 function wp_dropdown_categories( $args = '' ) {
325 'show_option_all' => '', 'show_option_none' => '',
326 'orderby' => 'id', 'order' => 'ASC',
328 'hide_empty' => 1, 'child_of' => 0,
329 'exclude' => '', 'echo' => 1,
330 'selected' => 0, 'hierarchical' => 0,
331 'name' => 'cat', 'id' => '',
332 'class' => 'postform', 'depth' => 0,
333 'tab_index' => 0, 'taxonomy' => 'category',
334 'hide_if_empty' => false
337 $defaults['selected'] = ( is_category() ) ? get_query_var( 'cat' ) : 0;
340 if ( isset( $args['type'] ) && 'link' == $args['type'] ) {
341 _deprecated_argument( __FUNCTION__, '3.0', '' );
342 $args['taxonomy'] = 'link_category';
345 $r = wp_parse_args( $args, $defaults );
347 if ( !isset( $r['pad_counts'] ) && $r['show_count'] && $r['hierarchical'] ) {
348 $r['pad_counts'] = true;
353 $tab_index_attribute = '';
354 if ( (int) $tab_index > 0 )
355 $tab_index_attribute = " tabindex=\"$tab_index\"";
357 $categories = get_terms( $taxonomy, $r );
358 $name = esc_attr( $name );
359 $class = esc_attr( $class );
360 $id = $id ? esc_attr( $id ) : $name;
362 if ( ! $r['hide_if_empty'] || ! empty($categories) )
363 $output = "<select name='$name' id='$id' class='$class' $tab_index_attribute>\n";
367 if ( empty($categories) && ! $r['hide_if_empty'] && !empty($show_option_none) ) {
370 * Filter a taxonomy drop-down display element.
372 * A variety of taxonomy drop-down display elements can be modified
373 * just prior to display via this filter. Filterable arguments include
374 * 'show_option_none', 'show_option_all', and various forms of the
379 * @see wp_dropdown_categories()
381 * @param string $element Taxonomy element to list.
383 $show_option_none = apply_filters( 'list_cats', $show_option_none );
384 $output .= "\t<option value='-1' selected='selected'>$show_option_none</option>\n";
387 if ( ! empty( $categories ) ) {
389 if ( $show_option_all ) {
391 /** This filter is documented in wp-includes/category-template.php */
392 $show_option_all = apply_filters( 'list_cats', $show_option_all );
393 $selected = ( '0' === strval($r['selected']) ) ? " selected='selected'" : '';
394 $output .= "\t<option value='0'$selected>$show_option_all</option>\n";
397 if ( $show_option_none ) {
399 /** This filter is documented in wp-includes/category-template.php */
400 $show_option_none = apply_filters( 'list_cats', $show_option_none );
401 $selected = ( '-1' === strval($r['selected']) ) ? " selected='selected'" : '';
402 $output .= "\t<option value='-1'$selected>$show_option_none</option>\n";
406 $depth = $r['depth']; // Walk the full depth.
408 $depth = -1; // Flat.
410 $output .= walk_category_dropdown_tree( $categories, $depth, $r );
413 if ( ! $r['hide_if_empty'] || ! empty($categories) )
414 $output .= "</select>\n";
417 * Filter the taxonomy drop-down output.
421 * @param string $output HTML output.
422 * @param array $r Arguments used to build the drop-down.
424 $output = apply_filters( 'wp_dropdown_cats', $output, $r );
433 * Display or retrieve the HTML list of categories.
435 * The list of arguments is below:
436 * 'show_option_all' (string) - Text to display for showing all categories.
437 * 'orderby' (string) default is 'ID' - What column to use for ordering the
439 * 'order' (string) default is 'ASC' - What direction to order categories.
440 * 'show_count' (bool|int) default is 0 - Whether to show how many posts are
442 * 'hide_empty' (bool|int) default is 1 - Whether to hide categories that
443 * don't have any posts attached to them.
444 * 'use_desc_for_title' (bool|int) default is 1 - Whether to use the
445 * description instead of the category title.
446 * 'feed' - See {@link get_categories()}.
447 * 'feed_type' - See {@link get_categories()}.
448 * 'feed_image' - See {@link get_categories()}.
449 * 'child_of' (int) default is 0 - See {@link get_categories()}.
450 * 'exclude' (string) - See {@link get_categories()}.
451 * 'exclude_tree' (string) - See {@link get_categories()}.
452 * 'echo' (bool|int) default is 1 - Whether to display or retrieve content.
453 * 'current_category' (int) - See {@link get_categories()}.
454 * 'hierarchical' (bool) - See {@link get_categories()}.
455 * 'title_li' (string) - See {@link get_categories()}.
456 * 'depth' (int) - The max depth.
460 * @param string|array $args Optional. Override default arguments.
461 * @return string HTML content only if 'echo' argument is 0.
463 function wp_list_categories( $args = '' ) {
465 'show_option_all' => '', 'show_option_none' => __('No categories'),
466 'orderby' => 'name', 'order' => 'ASC',
468 'show_count' => 0, 'hide_empty' => 1,
469 'use_desc_for_title' => 1, 'child_of' => 0,
470 'feed' => '', 'feed_type' => '',
471 'feed_image' => '', 'exclude' => '',
472 'exclude_tree' => '', 'current_category' => 0,
473 'hierarchical' => true, 'title_li' => __( 'Categories' ),
474 'echo' => 1, 'depth' => 0,
475 'taxonomy' => 'category'
478 $r = wp_parse_args( $args, $defaults );
480 if ( !isset( $r['pad_counts'] ) && $r['show_count'] && $r['hierarchical'] )
481 $r['pad_counts'] = true;
483 if ( true == $r['hierarchical'] ) {
484 $r['exclude_tree'] = $r['exclude'];
488 if ( !isset( $r['class'] ) )
489 $r['class'] = ( 'category' == $r['taxonomy'] ) ? 'categories' : $r['taxonomy'];
493 if ( !taxonomy_exists($taxonomy) )
496 $categories = get_categories( $r );
499 if ( $title_li && 'list' == $style )
500 $output = '<li class="' . esc_attr( $class ) . '">' . $title_li . '<ul>';
502 if ( empty( $categories ) ) {
503 if ( ! empty( $show_option_none ) ) {
504 if ( 'list' == $style )
505 $output .= '<li class="cat-item-none">' . $show_option_none . '</li>';
507 $output .= $show_option_none;
510 if ( ! empty( $show_option_all ) ) {
511 $posts_page = ( 'page' == get_option( 'show_on_front' ) && get_option( 'page_for_posts' ) ) ? get_permalink( get_option( 'page_for_posts' ) ) : home_url( '/' );
512 $posts_page = esc_url( $posts_page );
513 if ( 'list' == $style )
514 $output .= "<li class='cat-item-all'><a href='$posts_page'>$show_option_all</a></li>";
516 $output .= "<a href='$posts_page'>$show_option_all</a>";
519 if ( empty( $r['current_category'] ) && ( is_category() || is_tax() || is_tag() ) ) {
520 $current_term_object = get_queried_object();
521 if ( $current_term_object && $r['taxonomy'] === $current_term_object->taxonomy )
522 $r['current_category'] = get_queried_object_id();
526 $depth = $r['depth'];
528 $depth = -1; // Flat.
530 $output .= walk_category_tree( $categories, $depth, $r );
533 if ( $title_li && 'list' == $style )
534 $output .= '</ul></li>';
537 * Filter the HTML output of a taxonomy list.
541 * @param string $output HTML output.
542 * @param array $args An array of taxonomy-listing arguments.
544 $output = apply_filters( 'wp_list_categories', $output, $args );
555 * The text size is set by the 'smallest' and 'largest' arguments, which will
556 * use the 'unit' argument value for the CSS text size unit. The 'format'
557 * argument can be 'flat' (default), 'list', or 'array'. The flat value for the
558 * 'format' argument will separate tags with spaces. The list value for the
559 * 'format' argument will format the tags in a UL HTML list. The array value for
560 * the 'format' argument will return in PHP array type format.
562 * The 'orderby' argument will accept 'name' or 'count' and defaults to 'name'.
563 * The 'order' is the direction to sort, defaults to 'ASC' and can be 'DESC'.
565 * The 'number' argument is how many tags to return. By default, the limit will
566 * be to return the top 45 tags in the tag cloud list.
568 * The 'topic_count_text' argument is a nooped plural from _n_noop() to generate the
569 * text for the tooltip of the tag link.
571 * The 'topic_count_text_callback' argument is a function, which given the count
572 * of the posts with that tag returns a text for the tooltip of the tag link.
574 * The 'post_type' argument is used only when 'link' is set to 'edit'. It determines the post_type
575 * passed to edit.php for the popular tags edit links.
577 * The 'exclude' and 'include' arguments are used for the {@link get_tags()}
578 * function. Only one should be used, because only one will be used and the
579 * other ignored, if they are both set.
583 * @param array|string $args Optional. Override default arguments.
584 * @return array Generated tag cloud, only if no failures and 'array' is set for the 'format' argument.
586 function wp_tag_cloud( $args = '' ) {
588 'smallest' => 8, 'largest' => 22, 'unit' => 'pt', 'number' => 45,
589 'format' => 'flat', 'separator' => "\n", 'orderby' => 'name', 'order' => 'ASC',
590 'exclude' => '', 'include' => '', 'link' => 'view', 'taxonomy' => 'post_tag', 'post_type' => '', 'echo' => true
592 $args = wp_parse_args( $args, $defaults );
594 $tags = get_terms( $args['taxonomy'], array_merge( $args, array( 'orderby' => 'count', 'order' => 'DESC' ) ) ); // Always query top tags
596 if ( empty( $tags ) || is_wp_error( $tags ) )
599 foreach ( $tags as $key => $tag ) {
600 if ( 'edit' == $args['link'] )
601 $link = get_edit_term_link( $tag->term_id, $tag->taxonomy, $args['post_type'] );
603 $link = get_term_link( intval($tag->term_id), $tag->taxonomy );
604 if ( is_wp_error( $link ) )
607 $tags[ $key ]->link = $link;
608 $tags[ $key ]->id = $tag->term_id;
611 $return = wp_generate_tag_cloud( $tags, $args ); // Here's where those top tags get sorted according to $args
614 * Filter the tag cloud output.
618 * @param string $return HTML output of the tag cloud.
619 * @param array $args An array of tag cloud arguments.
621 $return = apply_filters( 'wp_tag_cloud', $return, $args );
623 if ( 'array' == $args['format'] || empty($args['echo']) )
630 * Default topic count scaling for tag links
632 * @param integer $count number of posts with that tag
633 * @return integer scaled count
635 function default_topic_count_scale( $count ) {
636 return round(log10($count + 1) * 100);
640 * Generates a tag cloud (heatmap) from provided data.
642 * The text size is set by the 'smallest' and 'largest' arguments, which will
643 * use the 'unit' argument value for the CSS text size unit. The 'format'
644 * argument can be 'flat' (default), 'list', or 'array'. The flat value for the
645 * 'format' argument will separate tags with spaces. The list value for the
646 * 'format' argument will format the tags in a UL HTML list. The array value for
647 * the 'format' argument will return in PHP array type format.
649 * The 'tag_cloud_sort' filter allows you to override the sorting.
650 * Passed to the filter: $tags array and $args array, has to return the $tags array
653 * The 'orderby' argument will accept 'name' or 'count' and defaults to 'name'.
654 * The 'order' is the direction to sort, defaults to 'ASC' and can be 'DESC' or
657 * The 'number' argument is how many tags to return. By default, the limit will
658 * be to return the entire tag cloud list.
660 * The 'topic_count_text' argument is a nooped plural from _n_noop() to generate the
661 * text for the tooltip of the tag link.
663 * The 'topic_count_text_callback' argument is a function, which given the count
664 * of the posts with that tag returns a text for the tooltip of the tag link.
666 * @todo Complete functionality.
669 * @param array $tags List of tags.
670 * @param string|array $args Optional, override default arguments.
671 * @return string|array Tag cloud as a string or an array, depending on 'format' argument.
673 function wp_generate_tag_cloud( $tags, $args = '' ) {
675 'smallest' => 8, 'largest' => 22, 'unit' => 'pt', 'number' => 0,
676 'format' => 'flat', 'separator' => "\n", 'orderby' => 'name', 'order' => 'ASC',
677 'topic_count_text' => null, 'topic_count_text_callback' => null,
678 'topic_count_scale_callback' => 'default_topic_count_scale', 'filter' => 1,
681 $args = wp_parse_args( $args, $defaults );
682 extract( $args, EXTR_SKIP );
684 $return = ( 'array' === $format ) ? array() : '';
686 if ( empty( $tags ) ) {
690 // Juggle topic count tooltips:
691 if ( isset( $args['topic_count_text'] ) ) {
692 // First look for nooped plural support via topic_count_text.
693 $translate_nooped_plural = $args['topic_count_text'];
694 } elseif ( ! empty( $args['topic_count_text_callback'] ) ) {
695 // Look for the alternative callback style. Ignore the previous default.
696 if ( $args['topic_count_text_callback'] === 'default_topic_count_text' ) {
697 $translate_nooped_plural = _n_noop( '%s topic', '%s topics' );
699 $translate_nooped_plural = false;
701 } elseif ( isset( $args['single_text'] ) && isset( $args['multiple_text'] ) ) {
702 // If no callback exists, look for the old-style single_text and multiple_text arguments.
703 $translate_nooped_plural = _n_noop( $args['single_text'], $args['multiple_text'] );
705 // This is the default for when no callback, plural, or argument is passed in.
706 $translate_nooped_plural = _n_noop( '%s topic', '%s topics' );
710 * Filter how the items in a tag cloud are sorted.
714 * @param array $tags Ordered array of terms.
715 * @param array $args An array of tag cloud arguments.
717 $tags_sorted = apply_filters( 'tag_cloud_sort', $tags, $args );
718 if ( empty( $tags_sorted ) ) {
722 if ( $tags_sorted !== $tags ) {
723 $tags = $tags_sorted;
724 unset( $tags_sorted );
726 if ( 'RAND' === $order ) {
729 // SQL cannot save you; this is a second (potentially different) sort on a subset of data.
730 if ( 'name' === $orderby ) {
731 uasort( $tags, '_wp_object_name_sort_cb' );
733 uasort( $tags, '_wp_object_count_sort_cb' );
736 if ( 'DESC' === $order ) {
737 $tags = array_reverse( $tags, true );
743 $tags = array_slice($tags, 0, $number);
746 $real_counts = array(); // For the alt tag
747 foreach ( (array) $tags as $key => $tag ) {
748 $real_counts[ $key ] = $tag->count;
749 $counts[ $key ] = $topic_count_scale_callback($tag->count);
752 $min_count = min( $counts );
753 $spread = max( $counts ) - $min_count;
756 $font_spread = $largest - $smallest;
757 if ( $font_spread < 0 )
759 $font_step = $font_spread / $spread;
763 foreach ( $tags as $key => $tag ) {
764 $count = $counts[ $key ];
765 $real_count = $real_counts[ $key ];
766 $tag_link = '#' != $tag->link ? esc_url( $tag->link ) : '#';
767 $tag_id = isset($tags[ $key ]->id) ? $tags[ $key ]->id : $key;
768 $tag_name = $tags[ $key ]->name;
770 if ( $translate_nooped_plural ) {
771 $title_attribute = sprintf( translate_nooped_plural( $translate_nooped_plural, $real_count ), number_format_i18n( $real_count ) );
773 $title_attribute = call_user_func( $topic_count_text_callback, $real_count, $tag, $args );
776 $a[] = "<a href='$tag_link' class='tag-link-$tag_id' title='" . esc_attr( $title_attribute ) . "' style='font-size: " .
777 str_replace( ',', '.', ( $smallest + ( ( $count - $min_count ) * $font_step ) ) )
778 . "$unit;'>$tag_name</a>";
786 $return = "<ul class='wp-tag-cloud'>\n\t<li>";
787 $return .= join( "</li>\n\t<li>", $a );
788 $return .= "</li>\n</ul>\n";
791 $return = join( $separator, $a );
797 * Filter the generated output of a tag cloud.
799 * The filter is only evaluated if a true value is passed
800 * to the $filter argument in wp_generate_tag_cloud().
804 * @see wp_generate_tag_cloud()
806 * @param array|string $return String containing the generated HTML tag cloud output
807 * or an array of tag links if the 'format' argument
809 * @param array $tags An array of terms used in the tag cloud.
810 * @param array $args An array of wp_generate_tag_cloud() arguments.
812 return apply_filters( 'wp_generate_tag_cloud', $return, $tags, $args );
820 * Callback for comparing objects based on name
825 function _wp_object_name_sort_cb( $a, $b ) {
826 return strnatcasecmp( $a->name, $b->name );
830 * Callback for comparing objects based on count
835 function _wp_object_count_sort_cb( $a, $b ) {
836 return ( $a->count > $b->count );
844 * Retrieve HTML list content for category list.
846 * @uses Walker_Category to create HTML list content.
848 * @see Walker_Category::walk() for parameters and return description.
850 function walk_category_tree() {
851 $args = func_get_args();
852 // the user's options are the third parameter
853 if ( empty($args[2]['walker']) || !is_a($args[2]['walker'], 'Walker') )
854 $walker = new Walker_Category;
856 $walker = $args[2]['walker'];
858 return call_user_func_array(array( &$walker, 'walk' ), $args );
862 * Retrieve HTML dropdown (select) content for category list.
864 * @uses Walker_CategoryDropdown to create HTML dropdown content.
866 * @see Walker_CategoryDropdown::walk() for parameters and return description.
868 function walk_category_dropdown_tree() {
869 $args = func_get_args();
870 // the user's options are the third parameter
871 if ( empty($args[2]['walker']) || !is_a($args[2]['walker'], 'Walker') )
872 $walker = new Walker_CategoryDropdown;
874 $walker = $args[2]['walker'];
876 return call_user_func_array(array( &$walker, 'walk' ), $args );
880 * Create HTML list of categories.
886 class Walker_Category extends Walker {
888 * What the class handles.
890 * @see Walker::$tree_type
894 var $tree_type = 'category';
897 * Database fields to use.
899 * @see Walker::$db_fields
901 * @todo Decouple this
904 var $db_fields = array ('parent' => 'parent', 'id' => 'term_id');
907 * Starts the list before the elements are added.
909 * @see Walker::start_lvl()
913 * @param string $output Passed by reference. Used to append additional content.
914 * @param int $depth Depth of category. Used for tab indentation.
915 * @param array $args An array of arguments. Will only append content if style argument value is 'list'.
916 * @see wp_list_categories()
918 function start_lvl( &$output, $depth = 0, $args = array() ) {
919 if ( 'list' != $args['style'] )
922 $indent = str_repeat("\t", $depth);
923 $output .= "$indent<ul class='children'>\n";
927 * Ends the list of after the elements are added.
929 * @see Walker::end_lvl()
933 * @param string $output Passed by reference. Used to append additional content.
934 * @param int $depth Depth of category. Used for tab indentation.
935 * @param array $args An array of arguments. Will only append content if style argument value is 'list'.
936 * @wsee wp_list_categories()
938 function end_lvl( &$output, $depth = 0, $args = array() ) {
939 if ( 'list' != $args['style'] )
942 $indent = str_repeat("\t", $depth);
943 $output .= "$indent</ul>\n";
947 * Start the element output.
949 * @see Walker::start_el()
953 * @param string $output Passed by reference. Used to append additional content.
954 * @param object $category Category data object.
955 * @param int $depth Depth of category in reference to parents. Default 0.
956 * @param array $args An array of arguments. @see wp_list_categories()
957 * @param int $id ID of the current category.
959 function start_el( &$output, $category, $depth = 0, $args = array(), $id = 0 ) {
962 $cat_name = esc_attr( $category->name );
964 /** This filter is documented in wp-includes/category-template.php */
965 $cat_name = apply_filters( 'list_cats', $cat_name, $category );
967 $link = '<a href="' . esc_url( get_term_link($category) ) . '" ';
968 if ( $use_desc_for_title == 0 || empty($category->description) ) {
969 $link .= 'title="' . esc_attr( sprintf(__( 'View all posts filed under %s' ), $cat_name) ) . '"';
972 * Filter the category description for display.
976 * @param string $description Category description.
977 * @param object $category Category object.
979 $link .= 'title="' . esc_attr( strip_tags( apply_filters( 'category_description', $category->description, $category ) ) ) . '"';
983 $link .= $cat_name . '</a>';
985 if ( !empty($feed_image) || !empty($feed) ) {
988 if ( empty($feed_image) )
991 $link .= '<a href="' . esc_url( get_term_feed_link( $category->term_id, $category->taxonomy, $feed_type ) ) . '"';
993 if ( empty($feed) ) {
994 $alt = ' alt="' . sprintf(__( 'Feed for all posts filed under %s' ), $cat_name ) . '"';
996 $title = ' title="' . $feed . '"';
997 $alt = ' alt="' . $feed . '"';
1004 if ( empty($feed_image) )
1007 $link .= "<img src='$feed_image'$alt$title" . ' />';
1011 if ( empty($feed_image) )
1015 if ( !empty($show_count) )
1016 $link .= ' (' . number_format_i18n( $category->count ) . ')';
1018 if ( 'list' == $args['style'] ) {
1020 $class = 'cat-item cat-item-' . $category->term_id;
1021 if ( !empty($current_category) ) {
1022 $_current_category = get_term( $current_category, $category->taxonomy );
1023 if ( $category->term_id == $current_category )
1024 $class .= ' current-cat';
1025 elseif ( $category->term_id == $_current_category->parent )
1026 $class .= ' current-cat-parent';
1028 $output .= ' class="' . $class . '"';
1029 $output .= ">$link\n";
1031 $output .= "\t$link<br />\n";
1036 * Ends the element output, if needed.
1038 * @see Walker::end_el()
1042 * @param string $output Passed by reference. Used to append additional content.
1043 * @param object $page Not used.
1044 * @param int $depth Depth of category. Not used.
1045 * @param array $args An array of arguments. Only uses 'list' for whether should append to output. @see wp_list_categories()
1047 function end_el( &$output, $page, $depth = 0, $args = array() ) {
1048 if ( 'list' != $args['style'] )
1051 $output .= "</li>\n";
1057 * Create HTML dropdown list of Categories.
1059 * @package WordPress
1063 class Walker_CategoryDropdown extends Walker {
1065 * @see Walker::$tree_type
1069 var $tree_type = 'category';
1072 * @see Walker::$db_fields
1074 * @todo Decouple this
1077 var $db_fields = array ('parent' => 'parent', 'id' => 'term_id');
1080 * Start the element output.
1082 * @see Walker::start_el()
1085 * @param string $output Passed by reference. Used to append additional content.
1086 * @param object $category Category data object.
1087 * @param int $depth Depth of category. Used for padding.
1088 * @param array $args Uses 'selected' and 'show_count' keys, if they exist. @see wp_dropdown_categories()
1090 function start_el( &$output, $category, $depth = 0, $args = array(), $id = 0 ) {
1091 $pad = str_repeat(' ', $depth * 3);
1093 /** This filter is documented in wp-includes/category-template.php */
1094 $cat_name = apply_filters( 'list_cats', $category->name, $category );
1096 $output .= "\t<option class=\"level-$depth\" value=\"".$category->term_id."\"";
1097 if ( $category->term_id == $args['selected'] )
1098 $output .= ' selected="selected"';
1100 $output .= $pad.$cat_name;
1101 if ( $args['show_count'] )
1102 $output .= ' ('. number_format_i18n( $category->count ) .')';
1103 $output .= "</option>\n";
1112 * Retrieve the link to the tag.
1115 * @see get_term_link()
1117 * @param int|object $tag Tag ID or object.
1118 * @return string Link on success, empty string if tag does not exist.
1120 function get_tag_link( $tag ) {
1121 if ( ! is_object( $tag ) )
1124 $tag = get_term_link( $tag, 'post_tag' );
1126 if ( is_wp_error( $tag ) )
1133 * Retrieve the tags for a post.
1137 * @param int $id Post ID.
1138 * @return array|bool Array of tag objects on success, false on failure.
1140 function get_the_tags( $id = 0 ) {
1143 * Filter the array of tags for the given post.
1147 * @see get_the_terms()
1149 * @param array $terms An array of tags for the given post.
1151 return apply_filters( 'get_the_tags', get_the_terms( $id, 'post_tag' ) );
1155 * Retrieve the tags for a post formatted as a string.
1159 * @param string $before Optional. Before tags.
1160 * @param string $sep Optional. Between tags.
1161 * @param string $after Optional. After tags.
1162 * @param int $id Optional. Post ID. Defaults to the current post.
1163 * @return string|bool|WP_Error A list of tags on success, false or WP_Error on failure.
1165 function get_the_tag_list( $before = '', $sep = '', $after = '', $id = 0 ) {
1168 * Filter the tags list for a given post.
1172 * @param string $tag_list List of tags.
1173 * @param string $before String to use before tags.
1174 * @param string $sep String to use between the tags.
1175 * @param string $after String to use after tags.
1176 * @param int $id Post ID.
1178 return apply_filters( 'the_tags', get_the_term_list( $id, 'post_tag', $before, $sep, $after ), $before, $sep, $after, $id );
1182 * Retrieve the tags for a post.
1186 * @param string $before Optional. Before list.
1187 * @param string $sep Optional. Separate items using this.
1188 * @param string $after Optional. After list.
1190 function the_tags( $before = null, $sep = ', ', $after = '' ) {
1191 if ( null === $before )
1192 $before = __('Tags: ');
1193 echo get_the_tag_list($before, $sep, $after);
1197 * Retrieve tag description.
1201 * @param int $tag Optional. Tag ID. Will use global tag ID by default.
1202 * @return string Tag description, available.
1204 function tag_description( $tag = 0 ) {
1205 return term_description( $tag );
1209 * Retrieve term description.
1213 * @param int $term Optional. Term ID. Will use global term ID by default.
1214 * @param string $taxonomy Optional taxonomy name. Defaults to 'post_tag'.
1215 * @return string Term description, available.
1217 function term_description( $term = 0, $taxonomy = 'post_tag' ) {
1218 if ( ! $term && ( is_tax() || is_tag() || is_category() ) ) {
1219 $term = get_queried_object();
1221 $taxonomy = $term->taxonomy;
1222 $term = $term->term_id;
1225 $description = get_term_field( 'description', $term, $taxonomy );
1226 return is_wp_error( $description ) ? '' : $description;
1230 * Retrieve the terms of the taxonomy that are attached to the post.
1234 * @param int|object $post Post ID or object.
1235 * @param string $taxonomy Taxonomy name.
1236 * @return array|bool|WP_Error Array of term objects on success, false or WP_Error on failure.
1238 function get_the_terms( $post, $taxonomy ) {
1239 if ( ! $post = get_post( $post ) )
1242 $terms = get_object_term_cache( $post->ID, $taxonomy );
1243 if ( false === $terms ) {
1244 $terms = wp_get_object_terms( $post->ID, $taxonomy );
1245 wp_cache_add($post->ID, $terms, $taxonomy . '_relationships');
1249 * Filter the list of terms attached to the given post.
1253 * @param array $terms List of attached terms.
1254 * @param int $post_id Post ID.
1255 * @param string $taxonomy Name of the taxonomy.
1257 $terms = apply_filters( 'get_the_terms', $terms, $post->ID, $taxonomy );
1259 if ( empty( $terms ) )
1266 * Retrieve a post's terms as a list with specified format.
1270 * @param int $id Post ID.
1271 * @param string $taxonomy Taxonomy name.
1272 * @param string $before Optional. Before list.
1273 * @param string $sep Optional. Separate items using this.
1274 * @param string $after Optional. After list.
1275 * @return string|bool|WP_Error A list of terms on success, false or WP_Error on failure.
1277 function get_the_term_list( $id, $taxonomy, $before = '', $sep = '', $after = '' ) {
1278 $terms = get_the_terms( $id, $taxonomy );
1280 if ( is_wp_error( $terms ) )
1283 if ( empty( $terms ) )
1286 foreach ( $terms as $term ) {
1287 $link = get_term_link( $term, $taxonomy );
1288 if ( is_wp_error( $link ) )
1290 $term_links[] = '<a href="' . esc_url( $link ) . '" rel="tag">' . $term->name . '</a>';
1294 * Filter the term links for a given taxonomy.
1296 * The dynamic portion of the filter name, $taxonomy, refers
1297 * to the taxonomy slug.
1301 * @param array $term_links An array of term links.
1303 $term_links = apply_filters( "term_links-$taxonomy", $term_links );
1305 return $before . join( $sep, $term_links ) . $after;
1309 * Display the terms in a list.
1313 * @param int $id Post ID.
1314 * @param string $taxonomy Taxonomy name.
1315 * @param string $before Optional. Before list.
1316 * @param string $sep Optional. Separate items using this.
1317 * @param string $after Optional. After list.
1318 * @return null|bool False on WordPress error. Returns null when displaying.
1320 function the_terms( $id, $taxonomy, $before = '', $sep = ', ', $after = '' ) {
1321 $term_list = get_the_term_list( $id, $taxonomy, $before, $sep, $after );
1323 if ( is_wp_error( $term_list ) )
1327 * Filter the list of terms to display.
1331 * @param array $term_list List of terms to display.
1332 * @param string $taxonomy The taxonomy name.
1333 * @param string $before String to use before the terms.
1334 * @param string $sep String to use between the terms.
1335 * @param string $after String to use after the terms.
1337 echo apply_filters( 'the_terms', $term_list, $taxonomy, $before, $sep, $after );
1341 * Check if the current post has any of given category.
1345 * @param string|int|array $category Optional. The category name/term_id/slug or array of them to check for.
1346 * @param int|object $post Optional. Post to check instead of the current post.
1347 * @return bool True if the current post has any of the given categories (or any category, if no category specified).
1349 function has_category( $category = '', $post = null ) {
1350 return has_term( $category, 'category', $post );
1354 * Check if the current post has any of given tags.
1356 * The given tags are checked against the post's tags' term_ids, names and slugs.
1357 * Tags given as integers will only be checked against the post's tags' term_ids.
1358 * If no tags are given, determines if post has any tags.
1360 * Prior to v2.7 of WordPress, tags given as integers would also be checked against the post's tags' names and slugs (in addition to term_ids)
1361 * Prior to v2.7, this function could only be used in the WordPress Loop.
1362 * As of 2.7, the function can be used anywhere if it is provided a post ID or post object.
1366 * @param string|int|array $tag Optional. The tag name/term_id/slug or array of them to check for.
1367 * @param int|object $post Optional. Post to check instead of the current post. (since 2.7.0)
1368 * @return bool True if the current post has any of the given tags (or any tag, if no tag specified).
1370 function has_tag( $tag = '', $post = null ) {
1371 return has_term( $tag, 'post_tag', $post );
1375 * Check if the current post has any of given terms.
1377 * The given terms are checked against the post's terms' term_ids, names and slugs.
1378 * Terms given as integers will only be checked against the post's terms' term_ids.
1379 * If no terms are given, determines if post has any terms.
1383 * @param string|int|array $term Optional. The term name/term_id/slug or array of them to check for.
1384 * @param string $taxonomy Taxonomy name
1385 * @param int|object $post Optional. Post to check instead of the current post.
1386 * @return bool True if the current post has any of the given tags (or any tag, if no tag specified).
1388 function has_term( $term = '', $taxonomy = '', $post = null ) {
1389 $post = get_post($post);
1394 $r = is_object_in_term( $post->ID, $taxonomy, $term );
1395 if ( is_wp_error( $r ) )