使用php下载图像链接

<?    
    $filename = $_GET["filename"];
    $buffer = file_get_contents($filename);

    /* Force download dialog... */
    header("Content-Type: application/force-download");
    header("Content-Type: application/octet-stream");
    header("Content-Type: application/download");

    /* Don't allow caching... */
    header("Cache-Control: must-revalidate,post-check=0,pre-check=0");

    /* Set data type,size and filename */
    header("Content-Type: application/octet-stream");
    header("Content-Transfer-Encoding: binary");
    header("Content-Length: " . strlen($buffer));
    header("Content-Disposition: attachment; filename=$filename");

    /* Send our file... */
    echo $buffer; 
?>

问题是,文件的名称以文件名中的整个路径结束,例如,此代码：

<a href="download.php?filename=images/something.jpg">

最终得到一个名为“images_something.jpg”的图片

我想从最终文件名中删除“images_”,到目前为止我还没有运气.

谢谢您的帮助！