<!-- Collection of code snippets by Arne Vajhøj -->
<!-- posted to eksperten.dk, usenet and other places (2002-now) -->
<?php
define('N',3000);

function test($ns, $reseed) {
    $a = array();
    for($i = 0; $i < N; $i++) $a[$i] = $i;
    $count = array();
    for($i = 0; $i < N; $i++) $count[$i] = 0;
    for($j = 0; $j < N; $j++) {
        $v = array_rand($a, 1);
        $count[$v]++;
        time_nanosleep(0, $ns);
        if($reseed) srand($j * 1000 + 123);
    }
    $stat = array_count_values($count);
    foreach($stat as $k => $v) {
        echo "$k : $v\r\n";
    }
}

echo "No sleep, no reseed\r\n";
test(0, false);
//echo "1 ms sleep, no reseed\r\n";
//test(1000000, false);
echo "No sleep, reseed\r\n";
test(0, true);
?>