3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = range(0,10000); $start = microtime(TRUE); md5(serialize($a)); echo "md5(serialize..:" . (microtime(TRUE) - $start) . "\n"; $start = microtime(TRUE); md5(json_encode($a)); echo "md5(json_encode..:" . (microtime(TRUE)-$start) . "\n";

preferences:
34.89 ms | 402 KiB | 5 Q