$time = time(0);
$pid = getmypid();
echo 'time is: ',$time,' (just the unix timestamp so very guessable)',PHP_EOL;
echo 'pid is: ',$pid, ' (process id of current PHP process usually in 1000s )',PHP_EOL;
$rand = mt_rand();
echo 'Output of 1st call to uninitialized to mt_rand is: '.$rand,PHP_EOL;
echo 'Output of 2nd call to uninitialized to mt_rand is: '.mt_rand(),PHP_EOL;
echo 'Output of 3rd call to uninitialized to mt_rand is: '.mt_rand(),PHP_EOL;

echo 'Guessing the seed now: ',PHP_EOL;

for ($i = 0; $i < 1000000; $i++) {
    $seed = (($time * $pid) ^ $i);
    mt_srand($seed);
    if ($rand == mt_rand()) {
        echo 'seed was : ',$seed,PHP_EOL;
        mt_srand($seed);
        echo 'Now we can guess the random',PHP_EOL;
        echo '1st: ',mt_rand(),PHP_EOL;
        echo '2nd: ',mt_rand(),PHP_EOL;
        echo '3rd: ',mt_rand(),PHP_EOL;
        break;
    } 
}