php打包gd库

使用sae 版 thinkphp 在本地和sae 上无法实现缩略图，缩略图主要使用在瀑布流上面，不然一张图片2 3 M，速度太慢，就自己封装了一个，见笑！

class Thumb{    // 设置最大宽度，用来在编辑器中使用和显示    private  $max_width  = null;    private  $file_name  = null;    private  $water_name = null;    //获得文件名和图片宽度    public function __construct($max_widht,$file_name,$water_name) {        $this->max_width  = $max_widht;        $this->file_name  = $file_name;        $this->water_name = $water_name;    }    public function create_image(){        // 获得ori图片信息        list($width,$height,$type) = getimagesize($this->file_name);              // 当原有图片大于 要求的最大宽度时，才需要进行压缩        if($width > $this->max_width){            // 获得图片压缩百分比            $per = $this->max_width / $width;            $new_width = $width * $per;            $new_height = $height * $per;                  }else{            $new_height =  $height;            $new_width  =  $width;        }        //创建一个真彩色图像        $image_p = imagecreatetruecolor($new_width, $new_height -10);        $image = $this->image_obj($type,  $this->file_name);         imagecopyresampled($image_p, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);        $this->image_dump($type, $image_p, $this->file_name);        $this->water();    }    /*     * 生成为图片添加水印     */    private function water(){        $water_name = $this->water_name;        $dist_name = $this->file_name;        list($dist_width,$dist_height,$type) = getimagesize($dist_name);        $dist_im   = $this->image_obj($type, $this->file_name);        $water_name = "D:/xampps/htdocs/buyingfeiblog/1/App/Modules/Admin/Tpl/Public/Images/water.png";        list($w_width,$w_height) = getimagesize($water_name); // 获得图片水印信息        $water_src =  imagecreatefrompng($water_name);        // 设置图片水印位置 在右下角        $x = ($dist_width - $w_width) / 4 * 3 ;        $y =($dist_height - $w_height) /4 * 3 ;        if(imagecopy($dist_im, $water_src, $x, $y, 0, 0, $w_width, $w_height)){            imagepng($dist_im,$dist_name);            echo "success";        }else{            echo "error";        }    }    // 生成图片类型，生成不同图片 保持图片原本类型不发生变化    private function image_dump($type,$image_p,$filename){         switch ($type){            case 1:                imagegif($image_p, $filename);                $dis_im = imagecreatefromgif(file_name);                break;            case 2:                imagejpeg($image_p,  $this->file_name);                $dis_im = imagecreatefromjpeg(file_name);                 break;            case 3:                imagepng($image_p,file_name);                $dis_im = imagecreatefrompng(file_name);                break;            default :        }    }    // 根据图片不同，生成不同资源对象    private function image_obj($type,$filename){         switch ($type){//          1 = GIF，2 = JPG，3 = PNG，            case 1:               $image =   imagecreatefromgif($filename);              break;            case 2:               $image =   imagecreatefromjpeg($filename);              break;            case 3:               $image =   imagecreatefrompng($filename);               break;            default :        }        return $image;    }}    $thumb = new  Thumb(725,"D:/xampps/htdocs/test/test.jpg");    $thumb->create_image();//create_image?>

就是这么简单，
主要包括生成真彩图，
创建图形对象资源
图片进行合并，ok！