php生成水印，包括位置和透明度(5)

                    $width = $new_w;

                    $height= $new_h;

                }

            // 载入原图

            $createFun  = 'ImageCreateFrom'.$type;

            $oldimg     = $createFun($this->img);

            // 创建缩略图

            if($type!='gif' && function_exists('imagecreatetruecolor')){

                $newimg = imagecreatetruecolor($width, $height);

            } else{

                $newimg = imagecreate($width, $height);

            }

            // 复制图片

            if(function_exists("ImageCopyResampled")){

                    ImageCopyResampled($newimg, $oldimg, 0, 0, $start_w, $start_h, $width, $height, $end_w,$end_h);

            } else{

                ImageCopyResized($newimg, $oldimg, 0, 0, $start_w, $start_h, $width, $height, $end_w,$end_h);

            }

            // 对jpeg图形设置隔行扫描

            $type == 'jpeg' && imageinterlace($newimg,1);

            // 生成图片

            $imageFun = 'image'.$type;

            !@$imageFun($newimg,$filename,100) && die('保存失败!检查目录是否存在并且可写?');

            ImageDestroy($newimg);

            ImageDestroy($oldimg);

            return $filename;