Online PHP editor | refs for SIjf7

<?php function isCorrect($string) { for( $i = 0; $i < strlen($string); $i++) { $string; } } $string = '({{}})'; var_dump(substr($string, 0, strlen($string)/2)); //assert(isCorrect('') === true); //assert(isCorrect('()') === true); //assert(isCorrect('{()}') === true); //assert(isCorrect('{()}{}') === true); //assert(isCorrect('(())') === true); //assert(isCorrect('{({({({()})})})}') === true); //assert(isCorrect('{(})') === false);