- var_dump: documentation ( source)
- usleep: documentation ( source)
<?php
$dob = new \DateTimeImmutable('now - 100 years');
usleep(250000);
$hundredYearsAgo = new \DateTimeImmutable('now - 100 years');
var_dump($dob);
var_dump($hundredYearsAgo);
var_dump($dob <= $hundredYearsAgo);