php圖片的裁切與輸出

$filepath = $uf->getpath(). '/'. $self['stud_photo'] ;
            $image_info = getImageSize($filepath);
            $height_org = $image_info[1];
            $width = $image_info[0];
           
            if ($height_org>$width*1.25) {
               //進行裁切
               $crop = ($height_org-$width*1.25)/2;
               $src = imagecreatefromstring(file_get_contents($filepath));
               //裁剪區
               $x = 0;
               $y = $crop;
               //寬和高

               $height = $width*1.25;
               //最终保存成寬和高，               $final_width = 480;
               $final_height = round($final_width * $height / $width);

               //這是關鍵
               $new_image = imagecreatetruecolor($final_width, $final_height);
               imagecopyresampled($new_image, $src, 0, 0, $x, $y, $final_width, $final_height, $width, $height);
              //輸出成檔案覆蓋掉原來的檔案
               imagejpeg($new_image, $filepath);           
            }
         }