wp_targeted_link_rel()WP 5.1.0

Adds rel noreferrer and noopener to all HTML A elements that have a target.

1 time — 0.000249 sec (fast) | 50000 times — 0.22 sec (very fast) | PHP 7.2.16, WP 5.2

No Hooks.

Return

String. Converted content.

Usage

wp_targeted_link_rel( $text );
$text(string) (required)
Content that may contain HTML A elements.

Examples

0

#1 Demo

$text = 'Foo <a href="http://google.com" target="_blank">google</a> bar';

echo wp_targeted_link_rel( $text );
// Foo <a href="http://google.com" target="_blank" rel="noopener">google</a> bar

Since WP 5.1.0, we can add rel attributes to any bit of HTML code.
Example used in wp-includes/widgets/class-wp-widget-text.php:

$text = wp_targeted_link_rel( $text );

Changelog

Since 5.1.0 Introduced.
Since 5.6.0 Removed 'noreferrer' relationship.

wp_targeted_link_rel() code WP 6.4.3

function wp_targeted_link_rel( $text ) {
	// Don't run (more expensive) regex if no links with targets.
	if ( stripos( $text, 'target' ) === false || stripos( $text, '<a ' ) === false || is_serialized( $text ) ) {
		return $text;
	}

	$script_and_style_regex = '/<(script|style).*?<\/\\1>/si';

	preg_match_all( $script_and_style_regex, $text, $matches );
	$extra_parts = $matches[0];
	$html_parts  = preg_split( $script_and_style_regex, $text );

	foreach ( $html_parts as &$part ) {
		$part = preg_replace_callback( '|<a\s([^>]*target\s*=[^>]*)>|i', 'wp_targeted_link_rel_callback', $part );
	}

	$text = '';
	for ( $i = 0; $i < count( $html_parts ); $i++ ) {
		$text .= $html_parts[ $i ];
		if ( isset( $extra_parts[ $i ] ) ) {
			$text .= $extra_parts[ $i ];
		}
	}

	return $text;
}