UploadFile::resetimg PHP Method

    public function resetimg($savePath, $image_name, $save_path)
    {
        $file_path = date('/Y/md/H/');
        $filename = UPLOAD_URL . $file_path . $image_name;
        //将URL转化为本地地址
        $oldimageinfo = getimagesize($filename);
        $w = intval($oldimageinfo[0]);
        $h = intval($oldimageinfo[1]);
        $type = intval($oldimageinfo[2]);
        switch ($type) {
            case 2:
                $image = imagecreatefromjpeg($filename);
                break;
            case 1:
                $image = imagecreatefromgif($filename);
                break;
            case 3:
                $image = imagecreatefrompng($filename);
                imagesavealpha($image, true);
                break;
        }
        if ($image) {
            if ($w <= 1000 && $w) {
            } elseif ($w) {
                $temp = 1000 / $w;
                $width = 1000;
                $height = floor($h * $temp);
                $image_p = imagecreatetruecolor($width, $height);
                imagealphablending($image_p, false);
                imagesavealpha($image_p, true);
                $res = imagecopyresampled($image_p, $image, 0, 0, 0, 0, $width, $height, $w, $h);
                $size = filesize($filename);
                $real = 500 * 1024;
                if ($size > $real) {
                    $temp = sqrt($real / $size);
                    $width = floor($width * $temp);
                    $height = floor($height * $temp);
                    $image_p = imagecreatetruecolor($width, $height);
                    imagealphablending($image_p, false);
                    imagesavealpha($image_p, true);
                    imagecopyresampled($image_p, $image, 0, 0, 0, 0, $width, $height, $w, $h);
                }
                $ii = imagejpeg($image_p, $savePath . $image_name);
                imagedestroy($image_p);
                imagedestroy($image);
            }
        }
    }