Online PHP editor | refs for RJftQ

<?php function Parenthesis($string) { $opening = array('}' => '{', ']' => '[', ')' => '('); $parens = array(); foreach (str_split($string) as $char) { switch ($char) { case '{': case '[': case '(': $parens[] = $char; break; case '}': case ']': case ')': if (!count($parens) || array_pop($parens) != $opening[$char]) return false; break; default: break; } } return count($parens) === 0; } function check_balanced($string) { echo "$string is " . (Parenthesis($string) ? '' : 'not ') . "balanced\n"; } check_balanced("{([]){}()}"); check_balanced("{C{}[{[a]}RqhL]{y2}}"); check_balanced("{([]){]()}");