3v4l.org

run code in 300+ PHP versions simultaneously
<?php list($msec, $sec) = explode(' ', microtime()); echo date('YmdHis', $sec).str_pad(round($msec*1000, 0), 3, '0') . "\n"; sleep(1); list($msec, $sec) = explode(' ', microtime()); echo date('YmdHis', $sec).str_pad(round($msec*1000, 0), 3, '0');

preferences:
35.93 ms | 402 KiB | 5 Q