3v4l.org

run code in 300+ PHP versions simultaneously
<?php for ($x = 1; $x <= 10; $x++) { $mykey = "\x00" . uniqid(); $var = array(); $var[$mykey] = TRUE; foreach($var as $key => $val) { if ($key === $mykey) { echo 'You got it right' . PHP_EOL; } else { echo 'You got it wrong' . PHP_EOL; } } usleep(10); }

preferences:
33.98 ms | 402 KiB | 5 Q