3v4l.org

run code in 300+ PHP versions simultaneously
<?php $arr = array("4","6","2","ololo"); $time = microtime(true); $i=0; while($i < 50000) { $i++; json_encode($arr); } $time1 = microtime(true) - $time; $time = microtime(true); $i=0; while($i < 50000) { $i++; serialize($arr); } $time2 = microtime(true) - $time; echo '1 took ' . number_format($time1, 3) . "\n"; echo '2 took ' . number_format($time2, 3) . "\n";

preferences:
31.95 ms | 402 KiB | 5 Q