3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a=array(); $b=null; $e=null; $l=100; $i=0; while($i++ < $l){ $b=microtime(true); $e=microtime(true); $a[] = $e - $b; } var_dump((array_sum($a) / count($a))*1000);

preferences:
34.21 ms | 402 KiB | 5 Q