GenerateBlocks Dynamic Link Open In New Window.php

// Use 'utility_new-window-link' GenerateBlocks Global Style
add_filter( 'render_block', function ( $block_content, $block ) {

	if ( is_admin() ) return $block_content;

	// Only touch blocks that actually output your utility class.
	if ( strpos( $block_content, 'utility_new-window-link' ) === false ) {
		return $block_content;
	}

	// 1) Add target="_blank" if missing.
	$block_content = preg_replace(
		'~<a(?![^>]*\btarget=)([^>]*)>~i',
		'<a target="_blank"$1>',
		$block_content
	);

	// 2) Ensure rel contains noopener noreferrer.
	// If rel exists, append missing tokens. If not, add rel.
	$block_content = preg_replace_callback(
		'~<a\b([^>]*)>~i',
		function ( $m ) {
			$attrs = $m[1];

			// Only act on links that open in a new tab.
			if ( ! preg_match( '~\btarget\s*=\s*([\'"])_blank\1~i', $attrs ) ) {
				return '<a' . $attrs . '>';
			}

			if ( preg_match( '~\brel\s*=\s*([\'"])(.*?)\1~i', $attrs, $relm ) ) {
				$quote = $relm[1];
				$rel   = $relm[2];

				$tokens = preg_split( '/\s+/', trim( $rel ) );
				$tokens = array_filter( $tokens );

				foreach ( array( 'noopener', 'noreferrer' ) as $need ) {
					if ( ! in_array( $need, $tokens, true ) ) {
						$tokens[] = $need;
					}
				}

				$new_rel = implode( ' ', $tokens );

				$attrs = preg_replace(
					'~\brel\s*=\s*([\'"])(.*?)\1~i',
					'rel=' . $quote . $new_rel . $quote,
					$attrs,
					1
				);

				return '<a' . $attrs . '>';
			}

			// No rel attribute — add one.
			return '<a' . $attrs . ' rel="noopener noreferrer">';

		},
		$block_content
	);

	return $block_content;

}, 99, 2 );