- var_dump: documentation ( source)
- microtime: documentation ( source)
- date: documentation ( source)
- strtotime: documentation ( source)
- str_pad: documentation ( source)
<?php
var_dump(str_pad(strtotime('2018-10-25T11:09:25+08:00'), 13, 0));
var_dump(date("Y-m-d h:i:sa", microtime()));