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

class RanHandler {
    private $min;
    private $max;
    private $old;
    private $queue;
    private $qix;
    public function __construct($min, $max, $old) {
        $this->min = $min;
        $this->max = $max;
        $this->old = $old;
        $this->queue = array();
        for($i = 0; $i < $this->old; $i++) $this->queue[] = $min - 1;
        $this->qix = 0;
    }
    public function getNumber() {
        do {
            $res = mt_rand($this->min, $this->max);
        } while(in_array($res, $this->queue));
        $this->queue[$this->qix] = $res;
        $this->qix = ($this->qix + 1) % $this->old;
        return $res;
    }
    public function getQueue() {
        return $this->queue;
    }
}

session_start();

if(isset($_SESSION['RanHandler'])) {
    $rh =  $_SESSION['RanHandler'];
} else {
    $rh = new RanHandler(1, 100, 10);
}

echo $rh->getNumber() . "\r\n";

print_r($rh->getQueue());

$_SESSION['RanHandler'] = $rh;

?>