PHP Check If Parentheses, Brackets and Braces Are Balanced

balance.php

<?php

/* PHP Check If Parentheses, Brackets and Braces Are Balanced


*/

function hasMatchedParenthesis($string) {
    $string = str_split($string);
    $stack = array();
    foreach($string as $key=>$value){

        switch ($value) {
            case '(': array_push($stack, 0); break;
            case ')': 
                if (array_pop($stack) !== 0)
                    return false;
            break;
            case '[': array_push($stack, 1); break;
            case ']': 
                if (array_pop($stack) !== 1)
                    return false;
            break;
            default: break;
            case '{': array_push($stack, 2); break;
            case '}': 
                if (array_pop($stack) !== 2)
                    return false;
            break;
        }
    }
    return (empty($stack));
}

$check_braces = array(
    '(())' => '', /* should pass */
    '({)}[' => '', /* should fail */
    '{{()[]}()}' => '', /* should pass */
    '({}])' => '' /* should fail  ")*/
);

foreach ($check_braces as $key => $value ) {
     $check_braces[$key] = (hasMatchedParenthesis($key) ? 'PASS' : 'FAIL' );
}

echo "<pre>";
print_r($check_braces);
echo "</pre>";
?>

{[{[()]]}} passed, instead of fail

@Looden my compiler {[{[()]]}} return FALSE