3v4l.org

run code in 300+ PHP versions simultaneously
<?php $timer = microtime(1); for ($i=1;$i<=1000000;$i++) echo 'a','a','a','a'; $timer = round(microtime(1) - $timer, 3); echo ', took: '.$timer. ' seconds'.PHP_EOL;

preferences:
27.81 ms | 402 KiB | 5 Q