wp_kses_bad_protocol_once( string $string, string $allowed_protocols,  $count = 1 )

Sanitizes content from bad protocols and other characters.

Description

This function searches for URL protocols at the beginning of $string, while handling whitespace and HTML entities.

Parameters

$string

(Required) Content to check for bad protocols

$allowed_protocols

(Required) Allowed protocols

Return

(string) Sanitized content

Source

File: wp-includes/kses.php 

function wp_kses_bad_protocol_once($string, $allowed_protocols, $count = 1 ) {
	$string  = preg_replace( '/(&#0*58(?![;0-9])|&#x0*3a(?![;a-f0-9]))/i', '$1;', $string );
	$string2 = preg_split( '/:|&#0*58;|&#x0*3a;|:/i', $string, 2 );
	if ( isset($string2[1]) && ! preg_match('%/\?%', $string2[0]) ) {
		$string = trim( $string2[1] );
		$protocol = wp_kses_bad_protocol_once2( $string2[0], $allowed_protocols );
		if ( 'feed:' == $protocol ) {
			if ( $count > 2 )
				return '';
			$string = wp_kses_bad_protocol_once( $string, $allowed_protocols, ++$count );
			if ( empty( $string ) )
				return $string;
		}
		$string = $protocol . $string;
	}

	return $string;
}

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Related

Changelog

Changelog
Version Description
WP-1.0.0 Introduced.