php foreach output in forward and reverse order

// 正序
foreach($files as $file_num => $file) {
if(is_file($directory.$file)){
//$file = iconv("gb2312","UTF-8",$file);  //或者 iconv("gb2312","UTF-8",$value);
$date = substr($file,0,9);
echo &#39;<li class="world-cup-&#39;.$date.&#39;">&#39;;
echo &#39;<a href="&#39;.$directory.$file.&#39;" rel="worldcup" title="巴西世界杯赛事&#39;.$date.&#39;">&#39;;
echo &#39;<img src="&#39;.$directory.$file.&#39;" alt="">&#39;;
echo &#39;</a>&#39;;
echo &#39;</li>&#39;;
}
}
// 倒序
foreach(array_reverse($files) as $file_num => $file) {
if(is_file($directory.$file)){
//$file = iconv("gb2312","UTF-8",$file);  //或者 iconv("gb2312","UTF-8",$value);
$date = substr($file,0,9);
echo &#39;<li class="world-cup-&#39;.$date.&#39;">&#39;;
echo &#39;<a href="&#39;.$directory.$file.&#39;" rel="worldcup" title="巴西世界杯赛事&#39;.$date.&#39;">&#39;;
echo &#39;<img src="&#39;.$directory.$file.&#39;" alt="">&#39;;
echo &#39;</a>&#39;;
echo &#39;</li>&#39;;
}
}