thinkphp上传图片并批量生成不同尺寸缩略图

1、配置信息

    //****************************各种类型图片缩略图尺寸设置*************************//
    "IMAGES_THUMB_SIZE_SETTING"     =>array(
        "USER_HEADER"       =>array(   //用户头像缩略图大小
            "64*64"     =>"64*64",
            "32*32"     =>"32*32"
        ),
        "PHOTOS_HEADER"  =>"128*128",                       //图片缩略图大小
        "EMOTIONS_PHOTO" =>"128*128"                      //动态缩略图大小
    ),

2、详细代码

/**
     * 文件上传方法，TP在此处有个坑，当图片名称命名不规范时，图片不能保存而且不会提示错误
     * 成功返回图片保存路径
     * 失败返回相关失败信息
     */
    public function upload(){
        /**
         * file_put_contents("1.txt",var_export($_POST,true));
         * file_put_contents("2.txt",var_export($GLOBALS["HTTP_RAW_POST_DATA"],true));
         * $raw_post_data = file_get_contents("php://input", "r");
         * file_put_contents("3.txt",var_export($raw_post_data, true));
         * file_put_contents("4.txt",var_export($_FILES, true));
         */
        $user_id = I("post.user_id",0,"intval");
        $type = I("get.type",1,"intval");//操作类型，1：用户头像上传，2：图片上传，3：说说图片上传
        $token = $this->token;
        $data = array();
        if($user_id){
            //user_id有传的话，那么说明是更新用户头像操作
            $return = $this->check_user_valid($token,$user_id);
            if(!$return){
                $data["ret_code"] = C("API_STATUS_CODE.USER_DOES_NOT_HAVE_POWER");
                $data["ret_msg"] = C("API_STATUS_CODE.USER_DOES_NOT_HAVE_POWER_MSG");
                $this->ajaxReturn($data);
            }
        }
        //设置文件存放路径及缩放比例
        $folder = "";
        $thumb_size = "";
        switch($type){
            case 1:
                $folder = "header";
                $thumb_size = C("IMAGES_THUMB_SIZE_SETTING.USER_HEADER");
                break;
            case 2:
                $folder = "photos";
                $thumb_size = C("IMAGES_THUMB_SIZE_SETTING.PHOTOS_HEADER");
                break;
            case 3:
                $folder = "emotions";
                $thumb_size = C("IMAGES_THUMB_SIZE_SETTING.EMOTIONS_PHOTO");
                break;
        }
        $path = C("SYSTEM_IMAGES_FOLDERS")."images/".$folder;
        if(!file_exists($path)){
            mkdir($path);
            chmod($path,755);
        }

        $file_arr = explode(".",$_FILES["file"]["name"]);
        $file_name = $file_arr[0];
        $sha1 = sha1(time().mt_rand());

        $config = array();
        $config["maxSize"] = 3145728;
        $config["exts"] = array("jpg", "gif", "png", "jpeg","JPG","GIF","PNG","JPEG");
        $config["rootPath"] = $path;
        $config["savePath"] = "/";
        $config["saveName"] = $sha1."-".$file_name;
        $upload  = new ThinkUpload($config);
        $info = $upload->uploadOne($_FILES["file"]);
        if(!$info) {
            $data["ret_code"] = C("API_STATUS_CODE.FAILED");
            $data["ret_msg"] = $upload->getError();
        }else{
            //文件存放路径
            $url = $path.$info["savepath"].$info["savename"];
            //生成缩略图
            $all_img_url = $this->_multi_thumb_save($path,$info,$sha1,$thumb_size,$_FILES["file"]["name"]);
            $data["ret_code"] = C("API_STATUS_CODE.SUCCESS");
            $data["ret_msg"] = C("API_STATUS_CODE.SUCCESS_MSG");
            $data["data"] = array(
                "url"           =>$url,
                "thumb_url"    =>$all_img_url
            );
        }
        $this->ajaxReturn($data);
    }

    /**
     * 批量生成不同尺寸缩略图
     * @param $path                原始图片
     * @param $info                图片上传后获得的object
     * @param $sha1                sha1()后得到的值
     * @param $size_arr            缩略尺寸数组
     * @param $file_name           原始图片名称
     * @return string              所有缩略图地址字串
     */
    private function _multi_thumb_save($path,$info,$sha1,$size_arr,$file_name){
        $all_img_url = "";
        $img_url_arr = array();
        //需要生成多个缩略图
        if(is_array($size_arr)){
            foreach($size_arr as $key =>$value){
                $img_url_arr[$key] = $this->_thumb_save($path,$info,$sha1,$value,$file_name);
            }
            $all_img_url = json_encode($img_url_arr);
        }else{
            $all_img_url = $this->_thumb_save($path,$info,$sha1,$size_arr,$file_name);
        }
        return $all_img_url;
    }

    /**
     * 批量生成不同尺寸缩略图
     * @param $path                原始图片
     * @param $info                图片上传后获得的object
     * @param $sha1                sha1()后得到的值
     * @param $thumb_size          缩略尺寸
     * @param $file_name           原始图片名称
     * @return string              所有缩略图地址字串
     */
    private function _thumb_save($path,$info,$sha1,$thumb_size,$file_name){
        $source = $path.$info["savepath"].$info["savename"];
        $image = new ThinkImage();
        $image->open($source);
        $size = explode("*",$thumb_size);
        $width = $size[0];
        $height = $size[1];
        //如果原始图片尺寸本来就小于缩略尺寸，那么不做压缩操作
        if($image->width() <= $width && $image->height() <= $height){
            $name = $source;
        }else{
            $name = $path.$info["savepath"].$sha1."-".$width."x".$height."-".$file_name;
            $image->thumb($width, $height,ThinkImage::IMAGE_THUMB_SCALE);
            $image->save($name);
        }
        return $name;
    }