WordPress at a glance
function is not described

wp_kses_bad_protocol() WP 1.0.0

Sanitize string from bad protocols.

This function removes all non-allowed protocols from the beginning of $string. It ignores whitespace and the case of the letters, and it does understand HTML entities. It does its work in a while loop, so it won't be fooled by a string like "javascript:javascript:alert(57)".

No Hooks.

Return

String. Filtered content

Usage

wp_kses_bad_protocol( $string, $allowed_protocols );
$string(string) (required)
Content to filter bad protocols from
$allowed_protocols(array) (required)
Allowed protocols to keep

Code of wp kses bad protocol: wp-includes/kses.php VER 5.0.3

<?php
function wp_kses_bad_protocol($string, $allowed_protocols) {
	$string = wp_kses_no_null($string);
	$iterations = 0;

	do {
		$original_string = $string;
		$string = wp_kses_bad_protocol_once($string, $allowed_protocols);
	} while ( $original_string != $string && ++$iterations < 6 );

	if ( $original_string != $string )
		return '';

	return $string;
}