brackets-checker.php

<?php

// @note Test #1
// Example usage: php brackets-checker.php '({()}[])'

$expressions = [
    '()]',
    '()[]',
    '(}',
    '({[]})',
    '[1+2(4*3{2/4[88+0]})]',
];

if ($argc == 2) {
    $expressions = [$argv[1]];
}

foreach ($expressions as $expression) {
    $brackets = preg_replace('/[^\[\]\(\)\{\}]/', '', $expression);

    do {
        $bracketsRemaining = preg_replace('/\[\]|\(\)|\{\}/', '', $brackets);
    } while ($brackets != $bracketsRemaining && $brackets = $bracketsRemaining);

    $flag = $brackets ? 'Не верно ' : 'Верно    ';
    echo "$flag: $expression" . PHP_EOL;
}

// @note Test #1 (select query for search non unique rows)
// SELECT id, COUNT(id) len FROM `some_table` GROUP BY id HAVING len > 1;