/**

     * 网络图片转换到本地并转换成base64位

     * @param $url

     * @return string

     */

    public function imgzhuanhuan($url)

    {

        //网络图片路径

//        $url='https://img.jinse.com/1435941_small.png';

        //获取文件后缀

        $type = substr($url, strrpos($url, ".")+1);

        //本地路径

        $path=public_path().'/images/'.time().'.png';

        //反斜杠\替换为/

        $path=str_replace('\\','/',$path);

        //网上图片保存到本地

        $paths=$this->curl_file_get_contents($url, $path);

        //转换成base64位

        $base64_image=$this->base64EncodeImage($paths);

        //删除本地图片

        @unlink($paths);

        return $base64_image;

    }

    //这里的path是我再本地项目中的临时存储路径：'upload/pictrue/xxx.png'

    //这个路径是要提前创建的，类似于一个空的模板，然后通过curl把二进制的图片流写进去

    //$url是网络图片的地址

    public function curl_file_get_contents($url, $path)

    {

        $hander = curl_init();

        $fp = fopen($path, 'wb');

        curl_setopt($hander, CURLOPT_URL, $url);

        curl_setopt($hander, CURLOPT_FILE, $fp);

        curl_setopt($hander, CURLOPT_HEADER, 0);

        curl_setopt($hander, CURLOPT_FOLLOWLOCATION, 1);

        curl_setopt($hander, CURLOPT_TIMEOUT, 60);

        curl_exec($hander);

        curl_close($hander);

        fclose($fp);

        return $path;

    }

    public function base64EncodeImage ($image_file) {

        $base64_image = '';

        $image_info = getimagesize($image_file);

        $image_data = fread(fopen($image_file, 'r'), filesize($image_file));

        $base64_image = 'data:' . $image_info['mime'] . ';base64,' . chunk_split(base64_encode($image_data));

        return $base64_image;

    }