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@ 2021-02-11T22:08:54Z

<?php

function Parenthesis($string) {
    $opening = array('}' => '{', ']' => '[', ')' => '(');
    $parens = array();
    foreach (str_split($string) as $char) {
        switch ($char) {
            case '{':
            case '[':
            case '(':
                $parens[] = $char;
                break;
            case '}':
            case ']':
            case ')':
                if (!count($parens) || array_pop($parens) != $opening[$char]) return false;
                break;
            default:
                break;
        }
    }
    return count($parens) === 0;
}

function check_balanced($string) {
    echo "$string is " . (Parenthesis($string) ? '' : 'not ') . "balanced\n";
}

check_balanced("{([]){}()}");
check_balanced("{C{}[{[a]}RqhL]{y2}}");
check_balanced("{([]){]()}");

Output for git.master, git.master_jit, rfc.property-hooks: {([]){}()} is balanced {C{}[{[a]}RqhL]{y2}} is balanced {([]){]()} is not balanced

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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