iis7_rewrite_rule_exists( string $filename ): bool

826function iis7_rewrite_rule_exists( $filename ) {827	if ( ! file_exists( $filename ) ) {828		return false;829	}830 831	if ( ! class_exists( 'DOMDocument', false ) ) {832		return false;833	}834 835	$doc = new DOMDocument();836 837	if ( $doc->load( $filename ) === false ) {838		return false;839	}840 841	$xpath = new DOMXPath( $doc );842	$rules = $xpath->query( '/configuration/system.webServer/rewrite/rules/rule[starts-with(@name,\'wordpress\')] | /configuration/system.webServer/rewrite/rules/rule[starts-with(@name,\'WordPress\')]' );843 844	if ( 0 === $rules->length ) {845		return false;846	}847 848	return true;849}