- var_dump: documentation ( source)
- usleep: documentation ( source)
- microtime: documentation ( source)
- fmod: documentation ( source)
<?php
$us = fmod(microtime(true), 1);
if ($us > .8) usleep(300e3);
$a = new DateTime();
usleep(1000);
$b = new DateTime();
var_dump($a->format("Y-m-d H:i:s") == $b->format("Y-m-d H:i:s"));
var_dump($a == $b);