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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 |
|---|---|
| 1103 | substr( $url, 0, 1 ) != '/' && !preg_match('/^[a-z0-9-]+?\.php/i', $url) ) |
| 1104 | $url = 'http://' . $url; |
| 1105 | |
| 1106 | $url = preg_replace('/&([^#])(?![a-z]{2,8};)/', '&$1', $url); |
| 1107 | if ( !is_array($protocols) ) |
| 1108 | $protocols = array('http', 'https', 'ftp', 'ftps', 'mailto', 'news', 'irc', 'gopher', 'nntp', 'feed', 'telnet'); |
| 1109 | if ( wp_kses_bad_protocol( $url, $protocols ) != $url ) |
| 1110 | return ''; |
| 1111 | |
| 1112 | return apply_filters('clean_url', $url, $original_url); |
| 1113 | } |
| 1114 | |
| 1115 | // Borrowed from the PHP Manual user notes. Convert entities, while |
| 1116 | // preserving already-encoded entities: |
| 1117 | function htmlentities2($myHTML) { |
| 1118 | $translation_table=get_html_translation_table (HTML_ENTITIES,ENT_QUOTES); |
| 1119 | $translation_table[chr(38)] = '&'; |
| 1120 | return preg_replace("/&(?![A-Za-z]{0,4}\w{2,3};|#[0-9]{2,3};)/","&" , strtr($myHTML, $translation_table)); |
| 1121 | } |