<?php

    $apple = array(0xFEEDFACE);

    $pear = array($apple);

    $apple[] = $pear;

    $pear[] = $apple;

    foreach ($apple as $key => $pear) {
        if ($apple[$key] == $pear && $pear[$key] == $apple) {
            foreach ($pear as $key => $apple) {
                if ($apple[$key] == $pear && $apple[$key] == $pear) {
                    echo "Loop";
                }
            }
        }
    }

?>