最近在阅读老项目的时候，发现服务器对外请求前面的开发者都是自己写一大段curl，但是风格各异（估计经历了多人维护) ，于是便想起引入Guzzle来发送请求，尽可能让代码简洁高效。

1.0版本

<?php
 $appId = C('APPID');
 $secret = C('APPKEY');
 $url = C('URL');
 $client = new Client();
 //start获取鉴权token
 if (!S('esign_token')) {
             //前辈封装的方法^_^
            $res = curl($url . "/v1/oauth2/access_token?appId={$appId}&secret={$secret}&grantType=client_credentials", 'GET');
            if ($res) {
                $res = json_decode($res);
                if ($res->code == 0) {
                    $token = $res->data->token;
                    S('esign_token', $token, 280);
                } else {
                    exit_error(-1, $res->message);
                }
            } else {
                exit_error(-1, '网络繁忙,请稍后再试.');
            }
        } else {
            $token = S('esign_token');
}
//END获取鉴权token
        $response = $client->request('PUT', $url . "/v2/identity/auth/pub/individual/{$flowId}/bankCard4Factors", [
                'headers' => [
                    'X-Tsign-Open-App-Id' => $appId,
                    'X-Tsign-Open-Token' => $token
                ],
                'json' => [
                    'authcode' => $data['code']
                ]
            ]);

            if ($response->getStatusCode() != 200) {
                exit_error(-1, '网络繁忙,请稍后再试试');
            }
            $body = json_decode($response->getBody());
            if ($body->code == 0) {
                $result = M('xxx')->where(['uid' => $uid])->save(['is_auth' => 888]);
                if (!$result) {
                    exit_error(-1, '修改实名状态出错');
                } else {
                    $h->editNickname($user_id, $data['name']);
                    cnl_exit_json(0, '恭喜您，实名认证通过');
                }
            } else {
                exit_error($body->code, $body->message);
            }
?>

但是单单这样改造的话，好像还是过于啰嗦，并没有带来什么改变，想一下这里每次请求带上的头信息基本是相同的，然后返回的结果判断也是基本相同，鉴于axios使用过拦截器，于是找到Guzzle手册有一共相关的中间件能实现请求之前自动添加头，请求返回后判断状态，如果状态码都正确就将需要的内容序列化成对象后，将预处理的结果返回

2.0版本

<?php

namespace Common\Common;

use GuzzleHttp\Client;
use GuzzleHttp\Handler\CurlHandler;
use GuzzleHttp\HandlerStack;
use GuzzleHttp\Middleware;
use Psr\Http\Message\RequestInterface;
use Psr\Http\Message\ResponseInterface;
use Think\Controller;

class Eclient extends Controller
{
    private static $appId;
    private static $url;
    private static $appKey;

    public static function getClient()
    {
        self::$appId = C('ESIGN.APPID');
        self::$url = C('ESIGN.URL');
        self::$appKey = C('ESIGN.APPKEY');
        $token = S('token');
        if (!$token = S('token')) {
            $token = self::_getToken();
            echo "shengqing";
            if ($token) {
                S('token', $token, 290);
            } else {
                self::error('获取token失败');
            }
        } else {
            $token = S('token');
        }
        $stack = new HandlerStack();
        $stack->setHandler(new CurlHandler());
        $stack->push(Middleware::mapRequest(function (RequestInterface $request) use ($token) {
            return $request->withHeader('X-Tsign-Open-App-Id', self::$appId)
                           ->withHeader('X-Tsign-Open-Token', $token);
        }));
        $stack->push(Middleware::mapResponse(function (ResponseInterface $response) {
            if ($response->getStatusCode() != 200 || json_decode($response->getBody())->code != 0) {
                $msg = json_decode($response->getBody())->message ?: '空返回';
                $this->error($msg);
            } else {
                var_dump($response);
                return $response->withBody(json_decode($response->getBody())->data);
            }
        }));
        return new Client(['handler' => $stack, 'base_uri'=>self::$url]);
    }

    private function _getToken()
    {
        $client = new Client();
        $response = $client->get(self::$url . "/v1/oauth2/access_token", [
            'query' => [
                'appId' => self::$appId,
                'secret' => self::$appKey,
                'grantType' => 'client_credentials'
            ]
        ]);
        if ($response->getStatusCode() == 200 && json_decode($response->getBody())->code == 0) {
            return json_decode($response->getBody())->data->token;
        } else {
            return false;
        }
    }
}

封装完成后，在调用的地方两句话即可完成调用

$client = Eclient::getClient();
$response = $client->get("/v1/accounts/xxx");
$this->success($response->getBody()->name);