- microtime: documentation ( source)
- round: documentation ( source)
- explode: documentation ( source)
- date: documentation ( source)
- sleep: documentation ( source)
- str_pad: documentation ( source)
<?php
list($msec, $sec) = explode(' ', microtime());
$one = date('YmdHis', $sec).str_pad(round($msec*1000, 0), 3, '0') . "\n";
sleep(1);
list($msec, $sec) = explode(' ', microtime());
$two = date('YmdHis', $sec).str_pad(round($msec*1000, 0), 3, '0');
echo $one == $two;