php 循环读取目录中的文件

header("Content-type:text/html;charset=utf-8;");
set_time_limit(0);
$dir_ = dirname(__FILE__)."/tmp/";
$dest = dirname(__FILE__)."/dir/";

$dread = opendir($dir_);
while(false != ($df = readdir($dread)))
{
    if($df != "." && $df != ".."){
        if(is_dir($dir_.$df)){
            echo "======".$df."======"."<BR>";
            echo dirs($dir_.$df."/")."<BR>";
        }
    }
}
function dirs($d)
{
    global $dest;
    $od = opendir($d);
    while(false != ($ddf = readdir($od)))
    {
        if($ddf != "." && $ddf != ".."){
            copy($d.$ddf,$dest.$ddf);
        }
    }

}
//该片段来自于http://outofmemory.cn