X-Git-Url: https://scripts.mit.edu/gitweb/autoinstalls/wordpress.git/blobdiff_plain/5d244c8fd9a27c9f89dd08da2af6fbc67d4fce63..refs/tags/wordpress-4.3:/wp-includes/functions.php

diff --git a/wp-includes/functions.php b/wp-includes/functions.php
index d903349c..30fac474 100644
--- a/wp-includes/functions.php
+++ b/wp-includes/functions.php
@@ -78,6 +78,8 @@ function current_time( $type, $gmt = 0 ) {
  *
  * @since 0.71
  *
+ * @global WP_Locale $wp_locale
+ *
  * @param string   $dateformatstring Format to display the date.
  * @param bool|int $unixtimestamp    Optional. Unix timestamp. Default false.
  * @param bool     $gmt              Optional. Whether to use GMT timezone. Default false.
@@ -161,6 +163,8 @@ function date_i18n( $dateformatstring, $unixtimestamp = false, $gmt = false ) {
  *
  * @since 2.3.0
  *
+ * @global WP_Locale $wp_locale
+ *
  * @param int $number   The number to convert based on locale.
  * @param int $decimals Optional. Precision of the number of decimal places. Default 0.
  * @return string Converted number in string format.
@@ -182,7 +186,7 @@ function number_format_i18n( $number, $decimals = 0 ) {
 /**
  * Convert number of bytes largest unit bytes will fit into.
  *
- * It is easier to read 1kB than 1024 bytes and 1MB than 1048576 bytes. Converts
+ * It is easier to read 1 kB than 1024 bytes and 1 MB than 1048576 bytes. Converts
  * number of bytes to human readable number by taking the number of that unit
  * that the bytes will go into it. Supports TB value.
  *
@@ -206,11 +210,14 @@ function size_format( $bytes, $decimals = 0 ) {
 		'GB' => 1073741824,     // pow( 1024, 3)
 		'MB' => 1048576,        // pow( 1024, 2)
 		'kB' => 1024,           // pow( 1024, 1)
-		'B ' => 1,              // pow( 1024, 0)
+		'B'  => 1,              // pow( 1024, 0)
 	);
-	foreach ( $quant as $unit => $mag )
-		if ( doubleval($bytes) >= $mag )
+
+	foreach ( $quant as $unit => $mag ) {
+		if ( doubleval( $bytes ) >= $mag ) {
 			return number_format_i18n( $bytes / $mag, $decimals ) . ' ' . $unit;
+		}
+	}
 
 	return false;
 }
@@ -378,6 +385,7 @@ function maybe_serialize( $data ) {
 
 	// Double serialization is required for backward compatibility.
 	// See https://core.trac.wordpress.org/ticket/12930
+	// Also the world will end. See WP 3.6.1.
 	if ( is_serialized( $data, false ) )
 		return serialize( $data );
 
@@ -487,10 +495,10 @@ function wp_extract_urls( $content ) {
  *
  * @since 1.5.0
  *
- * @see $wpdb
+ * @global wpdb $wpdb
  *
  * @param string $content Post Content.
- * @param int $post_ID Post ID.
+ * @param int    $post_ID Post ID.
  */
 function do_enclose( $content, $post_ID ) {
 	global $wpdb;
@@ -700,7 +708,7 @@ function _http_build_query( $data, $prefix = null, $sep = null, $key = '', $urle
 			$k = $key . '%5B' . $k . '%5D';
 		if ( $v === null )
 			continue;
-		elseif ( $v === FALSE )
+		elseif ( $v === false )
 			$v = '0';
 
 		if ( is_array($v) || is_object($v) )
@@ -778,8 +786,9 @@ function add_query_arg() {
 	wp_parse_str( $query, $qs );
 	$qs = urlencode_deep( $qs ); // this re-URL-encodes things that were already in the query string
 	if ( is_array( $args[0] ) ) {
-		$kayvees = $args[0];
-		$qs = array_merge( $qs, $kayvees );
+		foreach ( $args[0] as $k => $v ) {
+			$qs[ $k ] = $v;
+		}
 	} else {
 		$qs[ $args[0] ] = $args[1];
 	}
@@ -866,7 +875,11 @@ function wp_remote_fopen( $uri ) {
  *
  * @since 2.0.0
  *
- * @param string $query_vars Default WP_Query arguments.
+ * @global WP       $wp_locale
+ * @global WP_Query $wp_query
+ * @global WP_Query $wp_the_query
+ *
+ * @param string|array $query_vars Default WP_Query arguments.
  */
 function wp( $query_vars = '' ) {
 	global $wp, $wp_query, $wp_the_query;
@@ -881,6 +894,8 @@ function wp( $query_vars = '' ) {
  *
  * @since 2.3.0
  *
+ * @global array $wp_header_to_desc
+ *
  * @param int $code HTTP status code.
  * @return string Empty string if not found, or description if found.
  */
@@ -1120,7 +1135,7 @@ function bool_from_yn( $yn ) {
  *
  * @since 2.1.0
  *
- * @uses $wp_query Used to tell if the use a comment feed.
+ * @global WP_Query $wp_query Used to tell if the use a comment feed.
  */
 function do_feed() {
 	global $wp_query;
@@ -1434,7 +1449,7 @@ function wp_get_referer() {
 	$ref = false;
 	if ( ! empty( $_REQUEST['_wp_http_referer'] ) )
 		$ref = wp_unslash( $_REQUEST['_wp_http_referer'] );
-	else if ( ! empty( $_SERVER['HTTP_REFERER'] ) )
+	elseif ( ! empty( $_SERVER['HTTP_REFERER'] ) )
 		$ref = wp_unslash( $_SERVER['HTTP_REFERER'] );
 
 	if ( $ref && $ref !== wp_unslash( $_SERVER['REQUEST_URI'] ) )
@@ -1469,7 +1484,7 @@ function wp_mkdir_p( $target ) {
 	$wrapper = null;
 
 	// Strip the protocol.
-	if( wp_is_stream( $target ) ) {
+	if ( wp_is_stream( $target ) ) {
 		list( $wrapper, $target ) = explode( '://', $target, 2 );
 	}
 
@@ -1477,7 +1492,7 @@ function wp_mkdir_p( $target ) {
 	$target = str_replace( '//', '/', $target );
 
 	// Put the wrapper back on the target.
-	if( $wrapper !== null ) {
+	if ( $wrapper !== null ) {
 		$target = $wrapper . '://' . $target;
 	}
 
@@ -1513,7 +1528,7 @@ function wp_mkdir_p( $target ) {
 		 */
 		if ( $dir_perms != ( $dir_perms & ~umask() ) ) {
 			$folder_parts = explode( '/', substr( $target, strlen( $target_parent ) + 1 ) );
-			for ( $i = 1; $i <= count( $folder_parts ); $i++ ) {
+			for ( $i = 1, $c = count( $folder_parts ); $i <= $c; $i++ ) {
 				@chmod( $target_parent . '/' . implode( '/', array_slice( $folder_parts, 0, $i ) ), $dir_perms );
 			}
 		}
@@ -1601,10 +1616,12 @@ function wp_normalize_path( $path ) {
  *
  * @since 2.5.0
  *
+ * @staticvar string $temp
+ *
  * @return string Writable temporary directory.
  */
 function get_temp_dir() {
-	static $temp;
+	static $temp = '';
 	if ( defined('WP_TEMP_DIR') )
 		return trailingslashit(WP_TEMP_DIR);
 
@@ -1625,8 +1642,7 @@ function get_temp_dir() {
 	if ( is_dir( $temp ) && wp_is_writable( $temp ) )
 		return $temp;
 
-	$temp = '/tmp/';
-	return $temp;
+	return '/tmp/';
 }
 
 /**
@@ -1667,11 +1683,11 @@ function wp_is_writable( $path ) {
  */
 function win_is_writable( $path ) {
 
-	if ( $path[strlen( $path ) - 1] == '/' ) // if it looks like a directory, check a random file within the directory
+	if ( $path[strlen( $path ) - 1] == '/' ) { // if it looks like a directory, check a random file within the directory
 		return win_is_writable( $path . uniqid( mt_rand() ) . '.tmp');
-	else if ( is_dir( $path ) ) // If it's a directory (and not a file) check a random file within the directory
+	} elseif ( is_dir( $path ) ) { // If it's a directory (and not a file) check a random file within the directory
 		return win_is_writable( $path . '/' . uniqid( mt_rand() ) . '.tmp' );
-
+	}
 	// check tmp file for read/write capabilities
 	$should_delete_tmp_file = !file_exists( $path );
 	$f = @fopen( $path, 'a' );
@@ -1996,8 +2012,7 @@ function wp_upload_bits( $name, $deprecated, $bits, $time = null ) {
  * @since 2.5.0
  *
  * @param string $ext The extension to search.
- * @return string|null The file type, example: audio, video, document, spreadsheet, etc.
- *                     Null if not found.
+ * @return string|void The file type, example: audio, video, document, spreadsheet, etc.
  */
 function wp_ext2type( $ext ) {
 	$ext = strtolower( $ext );
@@ -2016,7 +2031,7 @@ function wp_ext2type( $ext ) {
 		'image'       => array( 'jpg', 'jpeg', 'jpe',  'gif',  'png',  'bmp',   'tif',  'tiff', 'ico' ),
 		'audio'       => array( 'aac', 'ac3',  'aif',  'aiff', 'm3a',  'm4a',   'm4b',  'mka',  'mp1',  'mp2',  'mp3', 'ogg', 'oga', 'ram', 'wav', 'wma' ),
 		'video'       => array( '3g2',  '3gp', '3gpp', 'asf', 'avi',  'divx', 'dv',   'flv',  'm4v',   'mkv',  'mov',  'mp4',  'mpeg', 'mpg', 'mpv', 'ogm', 'ogv', 'qt',  'rm', 'vob', 'wmv' ),
-		'document'    => array( 'doc', 'docx', 'docm', 'dotm', 'odt',  'pages', 'pdf',  'xps',  'oxps', 'rtf',  'wp', 'wpd', 'psd' ),
+		'document'    => array( 'doc', 'docx', 'docm', 'dotm', 'odt',  'pages', 'pdf',  'xps',  'oxps', 'rtf',  'wp', 'wpd', 'psd', 'xcf' ),
 		'spreadsheet' => array( 'numbers',     'ods',  'xls',  'xlsx', 'xlsm',  'xlsb' ),
 		'interactive' => array( 'swf', 'key',  'ppt',  'pptx', 'pptm', 'pps',   'ppsx', 'ppsm', 'sldx', 'sldm', 'odp' ),
 		'text'        => array( 'asc', 'csv',  'tsv',  'txt' ),
@@ -2027,8 +2042,6 @@ function wp_ext2type( $ext ) {
 	foreach ( $ext2type as $type => $exts )
 		if ( in_array( $ext, $exts ) )
 			return $type;
-
-	return null;
 }
 
 /**
@@ -2080,7 +2093,6 @@ function wp_check_filetype( $filename, $mimes = null ) {
  *               if original $filename is valid.
  */
 function wp_check_filetype_and_ext( $file, $filename, $mimes = null ) {
-
 	$proper_filename = false;
 
 	// Do basic extension validation and MIME mapping
@@ -2153,6 +2165,7 @@ function wp_check_filetype_and_ext( $file, $filename, $mimes = null ) {
  * Retrieve list of mime types and file extensions.
  *
  * @since 3.5.0
+ * @since 4.2.0 Support was added for GIMP (xcf) files.
  *
  * @return array Array of mime types keyed by the file extension regex corresponding to those types.
  */
@@ -2174,7 +2187,7 @@ function wp_get_mime_types() {
 	'gif' => 'image/gif',
 	'png' => 'image/png',
 	'bmp' => 'image/bmp',
-	'tif|tiff' => 'image/tiff',
+	'tiff|tif' => 'image/tiff',
 	'ico' => 'image/x-icon',
 	// Video formats.
 	'asf|asx' => 'video/x-ms-asf',
@@ -2224,6 +2237,7 @@ function wp_get_mime_types() {
 	'7z' => 'application/x-7z-compressed',
 	'exe' => 'application/x-msdownload',
 	'psd' => 'application/octet-stream',
+	'xcf' => 'application/octet-stream',
 	// MS Office formats.
 	'doc' => 'application/msword',
 	'pot|pps|ppt' => 'application/vnd.ms-powerpoint',
@@ -2467,6 +2481,7 @@ function _default_wp_die_handler( $message, $title = '', $args = array() ) {
 <html xmlns="http://www.w3.org/1999/xhtml" <?php if ( function_exists( 'language_attributes' ) && function_exists( 'is_rtl' ) ) language_attributes(); else echo "dir='$text_direction'"; ?>>
 <head>
 	<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
+	<meta name="viewport" content="width=device-width">
 	<title><?php echo $title ?></title>
 	<style type="text/css">
 		html {
@@ -2586,6 +2601,8 @@ function _default_wp_die_handler( $message, $title = '', $args = array() ) {
  * @since 3.2.0
  * @access private
  *
+ * @global wp_xmlrpc_server $wp_xmlrpc_server
+ *
  * @param string       $message Error message.
  * @param string       $title   Optional. Error title. Default empty.
  * @param string|array $args    Optional. Arguments to control behavior. Default empty array.
@@ -2644,7 +2661,7 @@ function _scalar_wp_die_handler( $message = '' ) {
  * @param int   $options Optional. Options to be passed to json_encode(). Default 0.
  * @param int   $depth   Optional. Maximum depth to walk through $data. Must be
  *                       greater than 0. Default 512.
- * @return bool|string The JSON encoded string, or false if it cannot be encoded.
+ * @return string|false The JSON encoded string, or false if it cannot be encoded.
  */
 function wp_json_encode( $data, $options = 0, $depth = 512 ) {
 	/*
@@ -2681,11 +2698,11 @@ function wp_json_encode( $data, $options = 0, $depth = 512 ) {
 /**
  * Perform sanity checks on data that shall be encoded to JSON.
  *
- * @see wp_json_encode()
- *
+ * @ignore
  * @since 4.1.0
  * @access private
- * @internal
+ *
+ * @see wp_json_encode()
  *
  * @param mixed $data  Variable (usually an array or object) to encode as JSON.
  * @param int   $depth Maximum depth to walk through $data. Must be greater than 0.
@@ -2744,11 +2761,13 @@ function _wp_json_sanity_check( $data, $depth ) {
 /**
  * Convert a string to UTF-8, so that it can be safely encoded to JSON.
  *
- * @see _wp_json_sanity_check()
- *
+ * @ignore
  * @since 4.1.0
  * @access private
- * @internal
+ *
+ * @see _wp_json_sanity_check()
+ *
+ * @staticvar bool $use_mb
  *
  * @param string $string The string which is to be converted.
  * @return string The checked string.
@@ -2901,8 +2920,14 @@ function _config_wp_siteurl( $url = '' ) {
 function _mce_set_direction( $input ) {
 	if ( is_rtl() ) {
 		$input['directionality'] = 'rtl';
-		$input['plugins'] .= ',directionality';
-		$input['toolbar1'] .= ',ltr';
+
+		if ( ! empty( $input['plugins'] ) && strpos( $input['plugins'], 'directionality' ) === false ) {
+			$input['plugins'] .= ',directionality';
+		}
+
+		if ( ! empty( $input['toolbar1'] ) && ! preg_match( '/\bltr\b/', $input['toolbar1'] ) ) {
+			$input['toolbar1'] .= ',ltr';
+		}
 	}
 
 	return $input;
@@ -2940,51 +2965,51 @@ function smilies_init() {
 
 	if ( !isset( $wpsmiliestrans ) ) {
 		$wpsmiliestrans = array(
-		':mrgreen:' => 'icon_mrgreen.gif',
-		':neutral:' => 'icon_neutral.gif',
-		':twisted:' => 'icon_twisted.gif',
-		  ':arrow:' => 'icon_arrow.gif',
-		  ':shock:' => 'icon_eek.gif',
-		  ':smile:' => 'icon_smile.gif',
-		    ':???:' => 'icon_confused.gif',
-		   ':cool:' => 'icon_cool.gif',
-		   ':evil:' => 'icon_evil.gif',
-		   ':grin:' => 'icon_biggrin.gif',
-		   ':idea:' => 'icon_idea.gif',
-		   ':oops:' => 'icon_redface.gif',
-		   ':razz:' => 'icon_razz.gif',
-		   ':roll:' => 'icon_rolleyes.gif',
-		   ':wink:' => 'icon_wink.gif',
-		    ':cry:' => 'icon_cry.gif',
-		    ':eek:' => 'icon_surprised.gif',
-		    ':lol:' => 'icon_lol.gif',
-		    ':mad:' => 'icon_mad.gif',
-		    ':sad:' => 'icon_sad.gif',
-		      '8-)' => 'icon_cool.gif',
-		      '8-O' => 'icon_eek.gif',
-		      ':-(' => 'icon_sad.gif',
-		      ':-)' => 'icon_smile.gif',
-		      ':-?' => 'icon_confused.gif',
-		      ':-D' => 'icon_biggrin.gif',
-		      ':-P' => 'icon_razz.gif',
-		      ':-o' => 'icon_surprised.gif',
-		      ':-x' => 'icon_mad.gif',
-		      ':-|' => 'icon_neutral.gif',
-		      ';-)' => 'icon_wink.gif',
+		':mrgreen:' => 'mrgreen.png',
+		':neutral:' => "\xf0\x9f\x98\x90",
+		':twisted:' => "\xf0\x9f\x98\x88",
+		  ':arrow:' => "\xe2\x9e\xa1",
+		  ':shock:' => "\xf0\x9f\x98\xaf",
+		  ':smile:' => 'simple-smile.png',
+		    ':???:' => "\xf0\x9f\x98\x95",
+		   ':cool:' => "\xf0\x9f\x98\x8e",
+		   ':evil:' => "\xf0\x9f\x91\xbf",
+		   ':grin:' => "\xf0\x9f\x98\x80",
+		   ':idea:' => "\xf0\x9f\x92\xa1",
+		   ':oops:' => "\xf0\x9f\x98\xb3",
+		   ':razz:' => "\xf0\x9f\x98\x9b",
+		   ':roll:' => 'rolleyes.png',
+		   ':wink:' => "\xf0\x9f\x98\x89",
+		    ':cry:' => "\xf0\x9f\x98\xa5",
+		    ':eek:' => "\xf0\x9f\x98\xae",
+		    ':lol:' => "\xf0\x9f\x98\x86",
+		    ':mad:' => "\xf0\x9f\x98\xa1",
+		    ':sad:' => 'frownie.png',
+		      '8-)' => "\xf0\x9f\x98\x8e",
+		      '8-O' => "\xf0\x9f\x98\xaf",
+		      ':-(' => 'frownie.png',
+		      ':-)' => 'simple-smile.png',
+		      ':-?' => "\xf0\x9f\x98\x95",
+		      ':-D' => "\xf0\x9f\x98\x80",
+		      ':-P' => "\xf0\x9f\x98\x9b",
+		      ':-o' => "\xf0\x9f\x98\xae",
+		      ':-x' => "\xf0\x9f\x98\xa1",
+		      ':-|' => "\xf0\x9f\x98\x90",
+		      ';-)' => "\xf0\x9f\x98\x89",
 		// This one transformation breaks regular text with frequency.
-		//     '8)' => 'icon_cool.gif',
-		       '8O' => 'icon_eek.gif',
-		       ':(' => 'icon_sad.gif',
-		       ':)' => 'icon_smile.gif',
-		       ':?' => 'icon_confused.gif',
-		       ':D' => 'icon_biggrin.gif',
-		       ':P' => 'icon_razz.gif',
-		       ':o' => 'icon_surprised.gif',
-		       ':x' => 'icon_mad.gif',
-		       ':|' => 'icon_neutral.gif',
-		       ';)' => 'icon_wink.gif',
-		      ':!:' => 'icon_exclaim.gif',
-		      ':?:' => 'icon_question.gif',
+		//     '8)' => "\xf0\x9f\x98\x8e",
+		       '8O' => "\xf0\x9f\x98\xaf",
+		       ':(' => 'frownie.png',
+		       ':)' => 'simple-smile.png',
+		       ':?' => "\xf0\x9f\x98\x95",
+		       ':D' => "\xf0\x9f\x98\x80",
+		       ':P' => "\xf0\x9f\x98\x9b",
+		       ':o' => "\xf0\x9f\x98\xae",
+		       ':x' => "\xf0\x9f\x98\xa1",
+		       ':|' => "\xf0\x9f\x98\x90",
+		       ';)' => "\xf0\x9f\x98\x89",
+		      ':!:' => "\xe2\x9d\x97",
+		      ':?:' => "\xe2\x9d\x93",
 		);
 	}
 
@@ -3169,8 +3194,9 @@ function wp_list_filter( $list, $args = array(), $operator = 'AND' ) {
  * @param int|string $field     Field from the object to place instead of the entire object
  * @param int|string $index_key Optional. Field from the object to use as keys for the new array.
  *                              Default null.
- * @return array Array of found values. If $index_key is set, an array of found values with keys
- *               corresponding to $index_key.
+ * @return array Array of found values. If `$index_key` is set, an array of found values with keys
+ *               corresponding to `$index_key`. If `$index_key` is null, array keys from the original
+ *               `$list` will be preserved in the results.
  */
 function wp_list_pluck( $list, $field, $index_key = null ) {
 	if ( ! $index_key ) {
@@ -3245,6 +3271,8 @@ function wp_maybe_load_widgets() {
  * Append the Widgets menu to the themes main menu.
  *
  * @since 2.2.0
+ *
+ * @global array $submenu
  */
 function wp_widgets_add_menu() {
 	global $submenu;
@@ -3387,6 +3415,53 @@ function _deprecated_function( $function, $version, $replacement = null ) {
 	}
 }
 
+/**
+ * Marks a constructor as deprecated and informs when it has been used.
+ *
+ * Similar to _deprecated_function(), but with different strings. Used to
+ * remove PHP4 style constructors.
+ *
+ * The current behavior is to trigger a user error if `WP_DEBUG` is true.
+ *
+ * This function is to be used in every PHP4 style constructor method that is deprecated.
+ *
+ * @since 4.3.0
+ * @access private
+ *
+ * @param string $class   The class containing the deprecated constructor.
+ * @param string $version The version of WordPress that deprecated the function.
+ */
+function _deprecated_constructor( $class, $version ) {
+
+	/**
+	 * Fires when a deprecated constructor is called.
+	 *
+	 * @since 4.3.0
+	 *
+	 * @param string $class   The class containing the deprecated constructor.
+	 * @param string $version The version of WordPress that deprecated the function.
+	 */
+	do_action( 'deprecated_constructor_run', $class, $version );
+
+	/**
+	 * Filter whether to trigger an error for deprecated functions.
+	 *
+	 * `WP_DEBUG` must be true in addition to the filter evaluating to true.
+	 *
+	 * @since 4.3.0
+	 *
+	 * @param bool $trigger Whether to trigger the error for deprecated functions. Default true.
+	 */
+	if ( WP_DEBUG && apply_filters( 'deprecated_constructor_trigger_error', true ) ) {
+		if ( function_exists( '__' ) ) {
+			trigger_error( sprintf( __( 'The called constructor method for %1$s is <strong>deprecated</strong> since version %2$s! Use %3$s instead.' ), $class, $version, '<pre>__construct()</pre>' ) );
+		} else {
+			trigger_error( sprintf( 'The called constructor method for %1$s is <strong>deprecated</strong> since version %2$s! Use %3$s instead.', $class, $version, '<pre>__construct()</pre>' ) );
+		}
+	}
+
+}
+
 /**
  * Mark a file as deprecated and inform when it has been used.
  *
@@ -3543,11 +3618,11 @@ function _doing_it_wrong( $function, $message, $version ) {
 	if ( WP_DEBUG && apply_filters( 'doing_it_wrong_trigger_error', true ) ) {
 		if ( function_exists( '__' ) ) {
 			$version = is_null( $version ) ? '' : sprintf( __( '(This message was added in version %s.)' ), $version );
-			$message .= ' ' . __( 'Please see <a href="http://codex.wordpress.org/Debugging_in_WordPress">Debugging in WordPress</a> for more information.' );
+			$message .= ' ' . __( 'Please see <a href="https://codex.wordpress.org/Debugging_in_WordPress">Debugging in WordPress</a> for more information.' );
 			trigger_error( sprintf( __( '%1$s was called <strong>incorrectly</strong>. %2$s %3$s' ), $function, $message, $version ) );
 		} else {
 			$version = is_null( $version ) ? '' : sprintf( '(This message was added in version %s.)', $version );
-			$message .= ' Please see <a href="http://codex.wordpress.org/Debugging_in_WordPress">Debugging in WordPress</a> for more information.';
+			$message .= ' Please see <a href="https://codex.wordpress.org/Debugging_in_WordPress">Debugging in WordPress</a> for more information.';
 			trigger_error( sprintf( '%1$s was called <strong>incorrectly</strong>. %2$s %3$s', $function, $message, $version ) );
 		}
 	}
@@ -3571,6 +3646,8 @@ function is_lighttpd_before_150() {
  *
  * @since 2.5.0
  *
+ * @global bool $is_apache
+ *
  * @param string $mod     The module, e.g. mod_rewrite.
  * @param bool   $default Optional. The default return value if the module is not found. Default false.
  * @return bool Whether the specified module is loaded.
@@ -3600,6 +3677,8 @@ function apache_mod_loaded($mod, $default = false) {
  *
  * @since 2.8.0
  *
+ * @global bool $is_iis7
+ *
  * @return bool Whether IIS7 supports permalinks.
  */
 function iis7_supports_permalinks() {
@@ -3616,7 +3695,7 @@ function iis7_supports_permalinks() {
 		 * Lastly we make sure that PHP is running via FastCGI. This is important because if it runs
 		 * via ISAPI then pretty permalinks will not work.
 		 */
-		$supports_permalinks = class_exists('DOMDocument') && isset($_SERVER['IIS_UrlRewriteModule']) && ( php_sapi_name() == 'cgi-fcgi' );
+		$supports_permalinks = class_exists('DOMDocument') && isset($_SERVER['IIS_UrlRewriteModule']) && ( PHP_SAPI == 'cgi-fcgi' );
 	}
 
 	/**
@@ -3640,7 +3719,7 @@ function iis7_supports_permalinks() {
  * @since 1.2.0
  *
  * @param string $file File path.
- * @param array $allowed_files List of allowed files.
+ * @param array  $allowed_files List of allowed files.
  * @return int 0 means nothing is wrong, greater than 0 means something was wrong.
  */
 function validate_file( $file, $allowed_files = '' ) {
@@ -3697,6 +3776,8 @@ function force_ssl_login( $force = null ) {
  *
  * @since 2.6.0
  *
+ * @staticvar bool $forced
+ *
  * @param string|bool $force Optional. Whether to force SSL in admin screens. Default null.
  * @return bool True if forced, false if not forced.
  */
@@ -3742,7 +3823,7 @@ function wp_guess_url() {
 			if ( false !== strpos( $_SERVER['SCRIPT_FILENAME'], $abspath_fix ) ) {
 				// Request is hitting a file inside ABSPATH
 				$directory = str_replace( ABSPATH, '', $script_filename_dir );
-				// Strip off the sub directory, and any file/query paramss
+				// Strip off the sub directory, and any file/query params
 				$path = preg_replace( '#/' . preg_quote( $directory, '#' ) . '/[^/]*$#i', '' , $_SERVER['REQUEST_URI'] );
 			} elseif ( false !== strpos( $abspath_fix, $script_filename_dir ) ) {
 				// Request is hitting a file above ABSPATH
@@ -3773,6 +3854,8 @@ function wp_guess_url() {
  *
  * @since 3.3.0
  *
+ * @staticvar bool $_suspend
+ *
  * @param bool $suspend Optional. Suspends additions if true, re-enables them if false.
  * @return bool The current suspend setting
  */
@@ -3794,6 +3877,8 @@ function wp_suspend_cache_addition( $suspend = null ) {
  *
  * @since 2.7.0
  *
+ * @global bool $_wp_suspend_cache_invalidation
+ *
  * @param bool $suspend Optional. Whether to suspend or enable cache invalidation. Default true.
  * @return bool The current suspend setting.
  */
@@ -3810,6 +3895,8 @@ function wp_suspend_cache_invalidation( $suspend = true ) {
  *
  * @since 3.0.0
  *
+ * @global object $current_site
+ *
  * @param int $site_id Optional. Site ID to test. Defaults to current site.
  *                     Defaults to current site.
  * @return bool True if $site_id is the main site of the network, or if not
@@ -3837,32 +3924,59 @@ function is_main_site( $site_id = null ) {
  * @return bool True if $network_id is the main network, or if not running Multisite.
  */
 function is_main_network( $network_id = null ) {
-	global $wpdb;
-
-	if ( ! is_multisite() )
+	if ( ! is_multisite() ) {
 		return true;
+	}
 
 	$current_network_id = (int) get_current_site()->id;
 
-	if ( ! $network_id )
+	if ( null === $network_id ) {
 		$network_id = $current_network_id;
+	}
+
 	$network_id = (int) $network_id;
 
-	if ( defined( 'PRIMARY_NETWORK_ID' ) )
-		return $network_id === (int) PRIMARY_NETWORK_ID;
+	return ( $network_id === get_main_network_id() );
+}
 
-	if ( 1 === $current_network_id )
-		return $network_id === $current_network_id;
+/**
+ * Get the main network ID.
+ *
+ * @since 4.3.0
+ *
+ * @global wpdb $wpdb WordPress database abstraction object.
+ *
+ * @return int The ID of the main network.
+ */
+function get_main_network_id() {
+	global $wpdb;
 
-	$primary_network_id = (int) wp_cache_get( 'primary_network_id', 'site-options' );
+	if ( ! is_multisite() ) {
+		return 1;
+	}
 
-	if ( $primary_network_id )
-		return $network_id === $primary_network_id;
+	if ( defined( 'PRIMARY_NETWORK_ID' ) ) {
+		$main_network_id = PRIMARY_NETWORK_ID;
+	} elseif ( 1 === (int) get_current_site()->id ) {
+		// If the current network has an ID of 1, assume it is the main network.
+		$main_network_id = 1;
+	} else {
+		$main_network_id = wp_cache_get( 'primary_network_id', 'site-options' );
 
-	$primary_network_id = (int) $wpdb->get_var( "SELECT id FROM $wpdb->site ORDER BY id LIMIT 1" );
-	wp_cache_add( 'primary_network_id', $primary_network_id, 'site-options' );
+		if ( false === $main_network_id ) {
+			$main_network_id = (int) $wpdb->get_var( "SELECT id FROM {$wpdb->site} ORDER BY id LIMIT 1" );
+			wp_cache_add( 'primary_network_id', $main_network_id, 'site-options' );
+		}
+	}
 
-	return $network_id === $primary_network_id;
+	/**
+	 * Filter the main network ID.
+	 *
+	 * @since 4.3.0
+	 *
+	 * @param int $main_network_id The ID of the main network.
+	 */
+	return (int) apply_filters( 'get_main_network_id', $main_network_id );
 }
 
 /**
@@ -3870,6 +3984,8 @@ function is_main_network( $network_id = null ) {
  *
  * @since 3.0.0
  *
+ * @staticvar bool $global_terms
+ *
  * @return bool True if multisite and global terms enabled.
  */
 function global_terms_enabled() {
@@ -3887,7 +4003,7 @@ function global_terms_enabled() {
 		 *
 		 * @since 3.0.0
 		 *
-		 * @param null $anbled Whether global terms are enabled.
+		 * @param null $enabled Whether global terms are enabled.
 		 */
 		$filter = apply_filters( 'global_terms_enabled', null );
 		if ( ! is_null( $filter ) )
@@ -3905,7 +4021,7 @@ function global_terms_enabled() {
  *
  * @since 2.8.0
  *
- * @return float|bool Timezone GMT offset, false otherwise.
+ * @return float|false Timezone GMT offset, false otherwise.
  */
 function wp_timezone_override_offset() {
 	if ( !$timezone_string = get_option( 'timezone_string' ) ) {
@@ -3973,6 +4089,8 @@ function _wp_timezone_choice_usort_callback( $a, $b ) {
  *
  * @since 2.9.0
  *
+ * @staticvar bool $mo_loaded
+ *
  * @param string $selected_zone Selected timezone.
  * @return string
  */
@@ -4113,10 +4231,14 @@ function _cleanup_header_comment( $str ) {
 }
 
 /**
- * Permanently delete posts, pages, attachments, and comments which have been
- * in the trash for EMPTY_TRASH_DAYS.
+ * Permanently delete comments or posts of any type that have held a status
+ * of 'trash' for the number of days defined in EMPTY_TRASH_DAYS.
+ *
+ * The default value of `EMPTY_TRASH_DAYS` is 30 (days).
  *
  * @since 2.9.0
+ *
+ * @global wpdb $wpdb
  */
 function wp_scheduled_delete() {
 	global $wpdb;
@@ -4168,7 +4290,7 @@ function wp_scheduled_delete() {
  * If the file data is not within that first 8kiB, then the author should correct
  * their plugin file and move the data headers to the top.
  *
- * @link http://codex.wordpress.org/File_Header
+ * @link https://codex.wordpress.org/File_Header
  *
  * @since 2.9.0
  *
@@ -4227,7 +4349,7 @@ function get_file_data( $file, $default_headers, $context = '' ) {
  *
  * @see __return_false()
  *
- * @return bool True.
+ * @return true True.
  */
 function __return_true() {
 	return true;
@@ -4242,7 +4364,7 @@ function __return_true() {
  *
  * @see __return_true()
  *
- * @return bool False.
+ * @return false False.
  */
 function __return_false() {
 	return false;
@@ -4317,7 +4439,7 @@ function send_nosniff_header() {
 /**
  * Return a MySQL expression for selecting the week number based on the start_of_week option.
  *
- * @internal
+ * @ignore
  * @since 3.0.0
  *
  * @param string $column Database column.
@@ -4423,17 +4545,22 @@ function send_frame_options_header() {
  * Retrieve a list of protocols to allow in HTML attributes.
  *
  * @since 3.3.0
+ * @since 4.3.0 Added 'webcal' to the protocols array.
  *
  * @see wp_kses()
  * @see esc_url()
  *
- * @return array Array of allowed protocols.
+ * @staticvar array $protocols
+ *
+ * @return array Array of allowed protocols. Defaults to an array containing 'http', 'https',
+ *               'ftp', 'ftps', 'mailto', 'news', 'irc', 'gopher', 'nntp', 'feed', 'telnet',
+ *               'mms', 'rtsp', 'svn', 'tel', 'fax', 'xmpp', and 'webcal'.
  */
 function wp_allowed_protocols() {
-	static $protocols;
+	static $protocols = array();
 
 	if ( empty( $protocols ) ) {
-		$protocols = array( 'http', 'https', 'ftp', 'ftps', 'mailto', 'news', 'irc', 'gopher', 'nntp', 'feed', 'telnet', 'mms', 'rtsp', 'svn', 'tel', 'fax', 'xmpp' );
+		$protocols = array( 'http', 'https', 'ftp', 'ftps', 'mailto', 'news', 'irc', 'gopher', 'nntp', 'feed', 'telnet', 'mms', 'rtsp', 'svn', 'tel', 'fax', 'xmpp', 'webcal' );
 
 		/**
 		 * Filter the list of protocols allowed in HTML attributes.
@@ -4528,7 +4655,7 @@ function _get_non_cached_ids( $object_ids, $cache_key ) {
  * @since 3.4.0
  * @access private
  *
- * @return bool true|false Whether the device is able to upload files.
+ * @return bool Whether the device is able to upload files.
  */
 function _device_can_upload() {
 	if ( ! wp_is_mobile() )
@@ -4677,9 +4804,10 @@ function wp_auth_check_html() {
  *
  * @since 3.6.0
  *
- * @param array|object $response  The Heartbeat response object or array.
- * @return array|object $response The Heartbeat response object or array with 'wp-auth-check'
- *                                value set.
+ * @global int $login_grace_period
+ *
+ * @param array $response  The Heartbeat response.
+ * @return array $response The Heartbeat response with 'wp-auth-check' value set.
  */
 function wp_auth_check( $response ) {
 	$response['wp-auth-check'] = is_user_logged_in() && empty( $GLOBALS['login_grace_period'] );
@@ -4752,6 +4880,9 @@ function _canonical_charset( $charset ) {
  *
  * @see reset_mbstring_encoding()
  *
+ * @staticvar array $encodings
+ * @staticvar bool  $overloaded
+ *
  * @param bool $reset Optional. Whether to reset the encoding back to a previously-set encoding.
  *                    Default false.
  */
@@ -4809,3 +4940,58 @@ function wp_validate_boolean( $var ) {
 
 	return (bool) $var;
 }
+
+/**
+ * Delete a file
+ *
+ * @since 4.2.0
+ *
+ * @param string $file The path to the file to delete.
+ */
+function wp_delete_file( $file ) {
+	/**
+	 * Filter the path of the file to delete.
+	 *
+	 * @since 2.1.0
+	 *
+	 * @param string $medium Path to the file to delete.
+	 */
+	$delete = apply_filters( 'wp_delete_file', $file );
+	if ( ! empty( $delete ) ) {
+		@unlink( $delete );
+	}
+}
+
+/**
+ * Outputs a small JS snippet on preview tabs/windows to remove `window.name` on unload.
+ *
+ * This prevents reusing the same tab for a preview when the user has navigated away.
+ *
+ * @since 4.3.0
+ */
+function wp_post_preview_js() {
+	global $post;
+
+	if ( ! is_preview() || empty( $post ) ) {
+		return;
+	}
+
+	// Has to match the window name used in post_submit_meta_box()
+	$name = 'wp-preview-' . (int) $post->ID;
+
+	?>
+	<script>
+	( function() {
+		var query = document.location.search;
+
+		if ( query && query.indexOf( 'preview=true' ) !== -1 ) {
+			window.name = '<?php echo $name; ?>';
+		}
+
+		if ( window.addEventListener ) {
+			window.addEventListener( 'unload', function() { window.name = ''; }, false );
+		}
+	}());
+	</script>
+	<?php
+}