3v4l.org

run code in 300+ PHP versions simultaneously
<?php error_reporting(0); $amount = 100000; $start = microtime(true); $alreadyOutput = array(); $iterator = $amount; while ($iterator --) { $num = rand(0, $amount); if(in_array($num, $alreadyOutput)){ continue; } $alreadyOutput[] = $num; } echo "in_array: ".(microtime(true) - $start)."ms || "; unset($alreadyOutput); $alreadyOutput = array(); $start2 = microtime(true); $iterator = $amount; while ($iterator --) { $num = rand(0, $amount); if(isset($alreadyOutput[$num])){ continue; } $alreadyOutput[$num] = true; } echo "by key: ".(microtime(true) - $start2)."ms";
Output for 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.7

Process exited with code 137.

preferences:
92.33 ms | 402 KiB | 90 Q