wp_split_selector_list( string $selector ): string[]

457function wp_split_selector_list( $selector ) {458	if ( ! str_contains( $selector, ',' ) ) {459		return array( $selector );460	}461 462	$selectors         = array();463	$current_selector  = '';464	$parentheses_depth = 0;465	$selector_length   = strlen( $selector );466 467	for ( $i = 0; $i < $selector_length; $i++ ) {468		$char = $selector[ $i ];469 470		if ( '(' === $char ) {471			++$parentheses_depth;472		} elseif ( ')' === $char && $parentheses_depth > 0 ) {473			--$parentheses_depth;474		} elseif ( ',' === $char && 0 === $parentheses_depth ) {475			$selectors[]      = $current_selector;476			$current_selector = '';477			continue;478		}479 480		$current_selector .= $char;481	}482 483	$selectors[] = $current_selector;484 485	return $selectors;486}