<?php

$array = array('System'=>array('1111','2222','3333'));

foreach ($array['System'] as $key => $value) {
    echo 'System "' . $key . '" has "' . $value . '" value.'."<br />\n";
}

System "0" has "1111" value.<br />
System "1" has "2222" value.<br />
System "2" has "3333" value.<br />