3v4l.org

run code in 300+ PHP versions simultaneously
<?php $array = array(1 => 1, 2 => 2, 3 => 3); $time = microtime(true); for ($i = 0; $i <= 100000; $i++) { array_merge($array); } var_dump(microtime(true) - $time); $time = microtime(true); for ($i = 0; $i <= 100000; $i++) { array_values($array); } var_dump(microtime(true) - $time);

preferences:
32.93 ms | 402 KiB | 5 Q