- array_push: documentation ( source)
- var_dump: documentation ( source)
- array_pop: documentation ( source)
<?php
function isCorrect($string) {
$len = strlen($string);
$stack = array();
for( $i = 0; $i < $len; ++$i)
{
if ( $string[$i] == '(' ) array_push($stack, $string[$i]);
elseif( $string[$i] == ')' )
{
if ( empty($stack) === false ) array_pop($stack);
else return false;
}
}
return empty($stack);
}
$string = '())((()))';
var_dump(isCorrect($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);