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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 |
|---|---|
| 2171 | $url = preg_replace('/&([^#])(?![a-z]{2,8};)/', '&$1', $url); |
| 2172 | $url = str_replace( "'", ''', $url ); |
| 2173 | } |
| 2174 | |
| 2175 | if ( !is_array($protocols) ) |
| 2176 | $protocols = array('http', 'https', 'ftp', 'ftps', 'mailto', 'news', 'irc', 'gopher', 'nntp', 'feed', 'telnet'); |
| 2177 | if ( wp_kses_bad_protocol( $url, $protocols ) != $url ) |
| 2178 | return ''; |
| 2179 | |
| 2180 | return apply_filters('clean_url', $url, $original_url, $context); |
| 2181 | } |
| 2182 | |
| 2183 | /** |
| 2184 | * Perform a deep string replace operation to ensure the values in $search are no longer present |
| 2185 | * |
| 2186 | * Repeats the replacement operation until it no longer replaces anything so as to remove "nested" values |
| 2187 | * e.g. $subject = '%0%0%0DDD', $search ='%0D', $result ='' rather than the '%0%0DD' that |
| 2188 | * str_replace would return |
| 2189 | * |