Hi, I wrote the following code:

function create_rand($time) {
    $counter = 0;
    $stop = microtime(true) + $time;
    while(microtime(true) < $stop)
        $counter++;
    return $counter;
}

function create_rand_max($time, $a, $b = false) {
    $rand_a = create_rand($time);
    $rand_b = create_rand($time);
    $rand_c = create_rand($time);
    $max = max($rand_a, $rand_b, $rand_c);
    $min = min($rand_a, $rand_b, $rand_c);
    if($max === $min)
        return create_rand_max($time, $a, $b);
    $middle = $rand_a + $rand_b + $rand_c - $max - $min;
    if($b !== false)
        return min($a, $b) + ($middle - $min) * (max($a, $b) - min($a, $b)) / ($max - $min);
    return ($middle - $min) * $a / ($max - $min);
}

$stop = 1000;
$sum = 0;

for($i = 0; $i < $stop; $i++) {
    $sum += create_rand_max(0.001, 100, 200);
}

echo $sum / $stop;

The average is usually between 157 to 161, instead of ~150.

Any ideas?