DEDECMS无法上传图片的解决办法

$imtypes = array("image/pjpeg", "image/jpeg", "image/gif", "image/png", "image/xpng", "image/wbmp", "image/bmp");
if (in_array(strtolower(trim($ {
$_key.'_type'
})), $imtypes)) {
$image_dd = @getimagesize($$_key);
if (!is_array($image_dd)) {
exit('Upload filetype not allow !');
}
}