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run code in 300+ PHP versions simultaneously

@ 2018-08-31T12:41:19Z

<?php

$input = '20-5*2/30+9=';
$inputLength = mb_strlen($input);
$number = 0;
$result = 0;
$op = '';
for ($i = 0; $i < $inputLength; $i++) {
    $char = mb_substr($input, $i, 1);
    if ($char == '*' || $char == '+' || $char == '-' || $char == '=' || $char == '/') {
        if ($op == '') {
            $result = $number;
        } elseif ($op == '+') {
            $result += $number;
        } elseif ($op == '-') {
            $result -= $number;
        } elseif ($op == '*') {
            $result *= $number;
        } elseif ($op == '/') {
            $result /= $number;
        }
        echo "op[$op] result[$result] number[$number] char[$char] \n";
        $op = $char;
        $number = 0;
        if ($char == '=') {
            echo "Ответ: $input$result";
        }
    } elseif (is_numeric($char) || $char == '.') {
        $number = $number * 10 + intval($char);
    } else {
        echo "Неверный символ:'$char\n";
        exit();
    }
}

Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.28, 8.4.1 - 8.4.14, 8.5.0 - 8.5.1: op[] result[20] number[20] char[-] op[-] result[15] number[5] char[*] op[*] result[30] number[2] char[/] op[/] result[1] number[30] char[+] op[+] result[10] number[9] char[=] Ответ: 20-5*2/30+9=10
Output for 8.4.15: /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.

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