3v4l.org

run code in 300+ PHP versions simultaneously
<?php $_a = range(0, 1000000); $ts = microtime(true); $a = range(0, 1000000); for($i = 0; $i < count($a); $i++) { $_a[$i] = $_a[$i]; } echo microtime(true) - $ts; echo '------------------'; $ts = microtime(true); $a = range(0, 1000000); for($i = 0; $i < count($a); $i++) { $a[$i] = $a[$i]; } echo microtime(true) - $ts; echo '------------------'; $ts = microtime(true); $a = range(0, 1000000); for($i = 0, $c = count($a); $i < $c; $i++) { $a[$i] = $a[$i]; } echo microtime(true) - $ts; echo '------------------';

preferences:
33.76 ms | 402 KiB | 5 Q