php的功能(14)

　　5. PHP列出目录内容

    function list_files($dir)
    {
        if(is_dir($dir))
        {
            if($handle = opendir($dir))
            {
                while(($file = readdir($handle)) !== false)
                {
                    if($file != "." && $file != ".." && $file != "Thumbs.db")
                    {
                        echo '<a target="_blank" href="'.$dir.$file.'">'.$file.'</a><br>'."\n";
                    }
                }
                closedir($handle);
            }
        }
    }

　　6. PHP销毁目录

　　删除一个目录，包括它的内容。

    /*****
    *@dir - Directory to destroy
    *@virtual[optional]- whether a virtual directory
    */
    function destroyDir($dir, $virtual = false)
    {
        $ds = DIRECTORY_SEPARATOR;
        $dir = $virtual ? realpath($dir) : $dir;
        $dir = substr($dir, -1) == $ds ? substr($dir, 0, -1) : $dir;
        if (is_dir($dir) && $handle = opendir($dir))
        {
            while ($file = readdir($handle))
            {
                if ($file == '.' || $file == '..')
                {