Online PHP editor | refs for OHOPR

<?php function isCorrect($string) { $len = strlen($string); $stack = []; for( $i = 0; i < $len; ++$i) { if ($string[i] == '(') array_push($stack, $string[i]); else if($string[i] == ')') { if ( empty($stack) === false) array_pop($stack); else return false; } } return empty($stack); } $string = '((()))'; isCorrect($string); //var_dump(isCorrect($string)); //var_dump(strlen($string) % 2); //assert(isCorrect('') === true); //assert(isCorrect('()') === true); //assert(isCorrect('{()}') === true); //assert(isCorrect('{()}{}') === true); //assert(isCorrect('(())') === true); //assert(isCorrect('{({({({()})})})}') === true); //assert(isCorrect('{(})') === false);