- var_dump: documentation ( source)
- time: documentation ( source)
- floor: documentation ( source)
- date: documentation ( source)
<?php
$a = floor(time()/86400)*86400;
var_dump($a);
var_dump(date('Y-m-d H:i:s', $a));
var_dump(date('Y-m-d H:i:s', time()));