wp_kses_bad_protocol( string $string, string[] $allowed_protocols )

Sanitizes a string and removed disallowed URL protocols.

Description Description

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

Parameters Parameters


(string) (Required) Content to filter bad protocols from.


(string[]) (Required) Array of allowed URL protocols.

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Return Return

(string) Filtered content.

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Source Source

File: wp-includes/kses.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;

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Changelog Changelog

Version Description
1.0.0 Introduced.

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