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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 1162 | // Replace ampersands ony when displaying. |
| 1163 | if ( 'display' == $context ) |
| 1164 | $url = preg_replace('/&([^#])(?![a-z]{2,8};)/', '&$1', $url); |
| 1165 | |
| 1166 | if ( !is_array($protocols) ) |
| 1167 | $protocols = array('http', 'https', 'ftp', 'ftps', 'mailto', 'news', 'irc', 'gopher', 'nntp', 'feed', 'telnet'); |
| 1168 | if ( wp_kses_bad_protocol( $url, $protocols ) != $url ) |
| 1169 | return ''; |
| 1170 | |
| 1171 | return apply_filters('clean_url', $url, $original_url, $context); |
| 1172 | } |
| 1173 | |
| 1174 | function sanitize_url( $url, $protocols = null ) { |
| 1175 | return clean_url( $url, $protocols, 'db'); |
| 1176 | } |
| 1177 | |
| 1178 | // Borrowed from the PHP Manual user notes. Convert entities, while |
| 1179 | // preserving already-encoded entities: |
| 1180 | function htmlentities2($myHTML) { |