- var_dump: documentation ( source)
- microtime: documentation ( source)
- date: documentation ( source)
- preg_replace: documentation ( source)
- str_pad: documentation ( source)
<?php
// request API
$sMsgId = date('YmdHis').str_pad(preg_replace('/^.+\./', '', microtime(true)), 4, '0', STR_PAD_LEFT);
echo '<pre>';
var_dump($sMsgId);
echo '</pre>';