WordPress at a glance
filter is not described

kses_allowed_protocols filter-hook . WP 3.0.0

Filters the list of protocols allowed in HTML attributes.

Usage

add_filter( 'kses_allowed_protocols', 'filter_function_name_346' );
function filter_function_name_346( $protocols ){
	// filter...

	return $protocols;
}
$protocols(array)
Array of allowed protocols e.g. 'http', 'ftp', 'tel', and more.

Where the hook is called

wp_allowed_protocols()
wp-includes/functions.php 5161
$protocols = array_unique( (array) apply_filters( 'kses_allowed_protocols', $protocols ) );

Where the hook is used (in WP core)

Does not used.