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<?php function isBalanced(string $string): bool { $stack = []; $start = '('; $end = ')'; $length = strlen($string); for ($i = 0; $i < $length; $i++) { $current = $string[i]; if ($current === $start) { array_push($start, $stack); } elseif ($current === $end) { if (empty($stack)) { return false; } array_pop($stack); } } return empty($stack); } $t = isBalanced('((()))('); print_r($t);
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