php foreach语句正序与倒序输出

// 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 '<li class="world-cup-'.$date.'">';
    echo '<a href="'.$directory.$file.'" rel="worldcup" title="巴西世界杯赛事'.$date.'">';
    echo '<img src="'.$directory.$file.'" alt="">';
    echo '</a>';
    echo '</li>';
  } //（脚本学堂 www.jb200.com 编辑整理）
}

// 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 '<li class="world-cup-'.$date.'">';
    echo '<a href="'.$directory.$file.'" rel="worldcup" title="巴西世界杯赛事'.$date.'">';
    echo '<img src="'.$directory.$file.'" alt="">';
    echo '</a>';
    echo '</li>';
  }
}