3v4l.org

run code in 300+ PHP versions simultaneously
<?php define("C5_RUNTIME_HASH",md5(mt_rand(1,100000)*microtime(1))); $i=500000; while($i--)md5(mt_rand(1,100000)*microtime(1)); echo C5_RUNTIME_HASH;
preferences:
28.53 ms | 402 KiB | 5 Q