time_debug.php

<?php

function t()
{
    static $time = null;
    if($time !== null)
    {
        $result = round((microtime(true) - $time) * 1000, 4) . 'ms';
        $time   = null;

        return $result;
    }
    else
    {
        $time = microtime(true);
    }
}