- var_dump: documentation ( source)
- usleep: documentation ( source)
- microtime: documentation ( source)
<?php
$mt = microtime(true);
var_dump($mt);
usleep(123123);
$dt = new DateTime('5 minutes ago');
var_dump($dt->format('c.u'));
// Remove microseconds.
$dt->setTime($dt->format('H'), $dt->format('i'), $dt->format('s'), 0);
var_dump($dt->format('c.u'));