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Nesting Demo Task at Codility.com

codility netbeansLesson 5 – Stacks and Queues – Nesting demo task solution code written in php. Gives 100/100 score at the time of publishing. The description of the problem is copyrighted, so please see the following link for it: //codility.com/demo/take-sample-test/nesting

Solution in php:

function solution($S) {
    $s = preg_replace('~[^\(\)]~', '', $S);
    if($S <> $s){
        return 0;
    $S = str_split($S);
        return 1;
    $counter = 0;
    foreach($S as $v){
            case '(':
            case ')':
        if($counter < 0){
            return 0;
    return $counter == 0 ? 1 : 0;

Given “AS IS”, can be ported from other languages from solutions found on the internet, please use with care.

Please note: we think that codility.com does not give a correct assessment of your real-world programming skills. For instance, reading the below would bring more understanding why: //codility-test-questions.blogspot.com/2013/01/my-experience-with-codility-test.html

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