php delete all files and directories under directory

<?php
/**
 * 递归实现删除目录下的所有的文件和文件夹
 * @param $dir 要删除的目录
 * @param bool $deleteRootToo 是否删除根目录 默认不删除
 http://www.manongjc.com/article/1333.html
 */
function unlinkRecursive($dir, $deleteRootToo = false)
{
    if(!$dh = @opendir($dir))
    {
        return;
    }
    while (false !== ($obj = readdir($dh)))
    {
        if($obj == &#39;.&#39; || $obj == &#39;..&#39;)
        {
            continue;
        }
        if (!@unlink($dir . &#39;/&#39; . $obj))//删除文件, 如果是目录则返回false
        {
            unlinkRecursive($dir.&#39;/&#39;.$obj, true);
        }
    }
    // http://www.manongjc.com/article/1334.html
    closedir($dh);
    if ($deleteRootToo)
    {
        @rmdir($dir);//删除目录
    }
    return;
}
unlinkRecursive(&#39;dir&#39;);
?>