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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 |
|---|---|
| 3718 | * @see esc_url() |
| 3719 | * |
| 3720 | * @return array Array of allowed protocols |
| 3721 | */ |
| 3722 | function wp_allowed_protocols() { |
| 3723 | static $protocols; |
| 3724 | |
| 3725 | if ( empty( $protocols ) ) { |
| 3726 | $protocols = array( 'http', 'https', 'ftp', 'ftps', 'mailto', 'news', 'irc', 'gopher', 'nntp', 'feed', 'telnet', 'mms', 'rtsp', 'svn', 'tel', 'fax', 'xmpp' ); |
| 3727 | $protocols = apply_filters( 'kses_allowed_protocols', $protocols ); |
| 3728 | } |
| 3729 | |
| 3730 | return $protocols; |
| 3731 | } |
| 3732 | |
| 3733 | /** |
| 3734 | * Return a comma separated string of functions that have been called to get to the current point in code. |
| 3735 | * |
| 3736 | * @link http://core.trac.wordpress.org/ticket/19589 |