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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 |
---|---|
1691 | $url = preg_replace('/&([^#])(?![a-z]{2,8};)/', '&$1', $url); |
1692 | $url = str_replace( "'", ''', $url ); |
1693 | } |
1694 |
|
1695 | if ( !is_array($protocols) ) |
1696 | $protocols = array('http', 'https', 'ftp', 'ftps', 'mailto', 'news', 'irc', 'gopher', 'nntp', 'feed', 'telnet'); |
1697 | if ( wp_kses_bad_protocol( $url, $protocols ) != $url ) |
1698 | return ''; |
1699 |
|
1700 | return apply_filters('clean_url', $url, $original_url, $context); |
1701 | } |
1702 |
|
1703 | /** |
1704 | * Performs clean_url() for database usage. |
1705 | * |
1706 | * @see clean_url() |
1707 | * |
1708 | * @since 2.3.1 |
1709 | * |