December 13, 2011 
Definition:
function wp_allowed_protocols() {}
Retrieve a list of protocols to allow in HTML attributes.
Return values
returns:Array of allowed protocols
Defined filters
- kses_allowed_protocols
apply_filters( 'kses_allowed_protocols', $protocols )
Source code
function wp_allowed_protocols() {
static $protocols;
if ( empty( $protocols ) ) {
$protocols = array( 'http', 'https', 'ftp', 'ftps', 'mailto', 'news', 'irc', 'gopher', 'nntp', 'feed', 'telnet', 'mms', 'rtsp', 'svn' );
$protocols = apply_filters( 'kses_allowed_protocols', $protocols );
}
return $protocols;
}
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A HitchHackers guide through WordPress 
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