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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 |
|---|---|
| 2058 | $url = preg_replace('/&([^#])(?![a-z]{2,8};)/', '&$1', $url); |
| 2059 | $url = str_replace( "'", ''', $url ); |
| 2060 | } |
| 2061 | |
| 2062 | if ( !is_array($protocols) ) |
| 2063 | $protocols = array('http', 'https', 'ftp', 'ftps', 'mailto', 'news', 'irc', 'gopher', 'nntp', 'feed', 'telnet'); |
| 2064 | if ( wp_kses_bad_protocol( $url, $protocols ) != $url ) |
| 2065 | return ''; |
| 2066 | |
| 2067 | return apply_filters('clean_url', $url, $original_url, $context); |
| 2068 | } |
| 2069 | |
| 2070 | /** |
| 2071 | * Escapes data for use in a MySQL query |
| 2072 | * |
| 2073 | * This is just a handy shortcut for $wpdb->escape(), for completeness' sake |
| 2074 | * |
| 2075 | * @since 2.8.0 |
| 2076 | * @param string $sql Unescaped SQL data |