<?php
    $rand = rand(10000, 99999);
    $_SESSION['random_key'] = $rand;

if ($_POST['confirm'] != '') {
    exit("Der Sicherheitscode ".$_POST['confirm']." wurde &uuml;bermittelt");
}

?>
<div class="box_smallcontainer">
    <div class="box_title">
        AR-Check
    </div>
    <div class="box_item">
        <form method="post" action="<?=$_SERVER[PHP_SELF]?>">

            Bitte Code abtippen: <? echo $_SESSION['random_key']; ?>&nbsp;
            <input type="hidden" name="archeck3x" value="ARC" />
            <input type="text" name="confirm" /> <input type="submit" name="archeck3x" value="ARC best&auml;tigen" />
        </form>
    </div>
</div>