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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 |
|---|---|
| 4120 | $protocols = array( 'http', 'https', 'ftp', 'ftps', 'mailto', 'news', 'irc', 'gopher', 'nntp', 'feed', 'telnet', 'mms', 'rtsp', 'svn', 'tel', 'fax', 'xmpp' ); |
| 4121 | |
| 4122 | /** |
| 4123 | * Filter the list of protocols allowed in HTML attributes. |
| 4124 | * |
| 4125 | * @since 3.0.0 |
| 4126 | * |
| 4127 | * @param array $protocols Array of allowed protocols e.g. 'http', 'ftp', 'tel', and more. |
| 4128 | */ |
| 4129 | $protocols = apply_filters( 'kses_allowed_protocols', $protocols ); |
| 4130 | } |
| 4131 | |
| 4132 | return $protocols; |
| 4133 | } |
| 4134 | |
| 4135 | /** |
| 4136 | * Return a comma separated string of functions that have been called to get to the current point in code. |
| 4137 | * |
| 4138 | * @link http://core.trac.wordpress.org/ticket/19589 |