- var_dump: documentation ( source)
- microtime: documentation ( source)
- sleep: documentation ( source)
<?php
$time0 = microtime(true);
sleep(1);
$time1 = microtime(true);
sleep(2);
$time2 = microtime(true);
var_dump(1000*($time1-$time0), 1000*($time2-$time1));