DiscuzX没有合法的文件被上传的修复方法

function get_image_info($target, $allowswf = false) {
$ext = discuz_upload::fileext($target);
$isimage = discuz_upload::is_image_ext($ext);
if(!$isimage && ($ext != 'swf' || !$allowswf)) {
return false;
} elseif(!is_readable($target)) {
return false;
} elseif($imageinfo = @getimagesize($target)) {
list($width, $height, $type) = !empty($imageinfo) ? $imageinfo : array('', '', '');
$size = $width * $height;
if($size > 16777216 || $size < 16 ) {
return false;
} elseif($ext == 'swf' && $type != 4 && $type != 13) {
return false;
} elseif($isimage && !in_array($type, array(1,2,3,6,13))) {
return false;
}
return $imageinfo;
} else {
return false;
}
}