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run code in 300+ PHP versions simultaneously

@ 2019-02-04T04:13:28Z

<?php
$msg=(string)($_GET['message']?? $_POST['message'] ?? "no message!");
$answer=NULL;
var_dump(getcwd());
register_shutdown_function(function()use(&$answer){
	var_dump(getcwd());
	file_put_contents(__DIR__.DIRECTORY_SEPARATOR.'msg.log.txt',json_encode(['answer'=>$answer,'$_GET'=>$_GET],JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES  | JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_LINE_TERMINATORS ),FILE_APPEND|LOCK_EX);
});

$matches=NULL;
$isMatch=preg_match("/(\d+)\s*(\+|\-|\*|\/|\:)\s*(\d+)/",$msg,$matches);
if($isMatch){
    $l=(int)$matches[1];
    $o=$matches[2];
    $r=(int)$matches[3];
    switch($o){
        case '+':
            $res=$l+$r;
            break;
        case '-':
            $res=$l-$r;
            break;
        case '*':
            $res=$l*$r;
            break;
        case '/':
        case ':':
            $res=$l/$r;
            break;
        default:
            throw new \LogicException("invalid operator passed regex??!");
    }
	$answer="!check {$res}";
    echo $answer;
}

Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6: string(1) "/" string(1) "/" Warning: file_put_contents(/in/msg.log.txt): Failed to open stream: Permission denied in /in/fuRZs on line 7
Output for 8.3.5: Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 string(1) "/" string(1) "/" Warning: file_put_contents(/in/msg.log.txt): Failed to open stream: Permission denied in /in/fuRZs on line 7
Output for 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33: string(1) "/" string(1) "/" Warning: file_put_contents(/in/msg.log.txt): failed to open stream: Permission denied in /in/fuRZs on line 7

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