thinkphp base64图片保存并返回路径

用ajax上传图片的base64编码至服务器，然后在控制器中调用$this->saveBase64Image($base64);
返回的code如果等于0，则保存图片成功，路径为['url'];

private function saveBase64Image($base64_image_content){

        if (preg_match('/^(data:\s*image\/(\w+);base64,)/', $base64_image_content, $result)){
                  //图片后缀
                  $type = $result[2];
                  //保存位置--图片名
                  $image_name=date('His').str_pad(mt_rand(1, 99999), 5, '0', STR_PAD_LEFT).".".$type;
                  $image_file_path = '/uploads/image/'.date('Ymd');
                  $image_file = ROOT_PATH.'public'.$image_file_path;
                  $imge_real_url = $image_file.'/'.$image_name;
                  $imge_web_url = $image_file_path.'/'.$image_name;
                  if (!file_exists($image_file)){
                    mkdir($image_file, 0700);
                    fopen($image_file.'\\'.$image_name, "w");
                  } 
                  //解码
                  $decode=base64_decode(str_replace($result[1], '', $base64_image_content));
                  if (file_put_contents($imge_real_url, $decode)){
                        $data['code']=0;
                        $data['imageName']=$image_name;
                        $data['url']='https://'.$_SERVER['HTTP_HOST'].$imge_web_url;
                        $data['msg']='保存成功！';
                  }else{
                    $data['code']=1;
                    $data['imgageName']='';
                    $data['url']='';
                    $data['msg']='图片保存失败！';
                  }
        }else{
            $data['code']=1;
            $data['imgageName']='';
            $data['url']='';
            $data['msg']='base64图片格式有误！';
        }       
        return $data;
    }