微信小程序获得用户信息、session、openid和unionid的thinkphp代码

作者：未署名，来自原文地址 
我用thinkphp写了个公共类Common供参考

前端代码：

//刷新用户信息
function updateUserInfo(){
    wx.login({
      success: function(loginRes) {
        if (loginRes.code) {
          console.log('获取code成功！code:' + loginRes.code);
          wx.getUserInfo({
            success: function (userinfoRes) {
              console.log('获得用户信息成功！userInfo:');
              console.log(userinfoRes);
              var userInfoStr=JSON.stringify(userinfoRes);
              wx.request({
                url: ',
                data: {
                  code: loginRes.code,
                  userInfo:userInfoStr
                },
                header: {
                    'content-type': 'application/x-www-form-urlencoded'
                },
                method:'POST',
                success: function(res) {
                  //缓存session及userInfo
                  //var obj = JSON.parse(res.data);
                  if(res.data.error==0){
                    console.log('刷新缓存成功！');
                    wx.setStorage({
                      key:"session",
                      data:{
                        session:res.data.session,
                        userInfo:userinfoRes.userInfo,
                        expires:res.data.expires   //超时时间戳
                      },
                      success:function(){
                        console.log('写入缓存成功！');
                      },
                      fail:function(){
                        console.log('写入缓存失败！');
                      }
                    })
                  }else{
                    console.log('刷新缓存失败！');
                    console.log(res);
                  }
                },
                fail:function(res){
                  console.log('刷新session失败！');
                  console.log(res)
                }
              });
            },
            fail:function(res){
              console.log('获取用户信息失败！' + res)
            }
          });
        }else {
          console.log('获取用户登录态失败！' + res.errMsg)
        }
      }
    });
}

后端代码：

<?php
/*
 * 小程序公共类
 */
namespace Weixin\Controller;
use Think\Controller\RestController;
class CommonController extends RestController{
    public function getSession(){
        $code=$_POST['code'];
        if(!$code){
			$data['errmsg']='code为空';
			$data['error']=1;
			$this->response($data,'json');
			exit;
		}
		if(!$_POST['userInfo']){
            $data['errmsg']='userInfo为空';
			$data['error']=1;
            $this->response($data,'json');
            exit;
        }
        $userInfo=json_decode($_POST['userInfo'],true);
        $return=$this->updateSession($code,$userInfo);
        $this->response($return,'json');
    }
    //刷新session
    private function updateSession($code,$userInfo){
        $return=$this->getOAuth($code);
		if(!$return['session_key']){
            $data['errmsg']='getOAuth函数报错:'.json_encode($return);
            $data['error']=1;
			return $data;
            exit;
        }
        $unionid_Data=json_decode($this->getUnionID($return['session_key'],$userInfo),true);
        if(!$unionid_Data['unionId']){
			$data['errmsg']='getUnionID函数报错:'.json_encode($unionid_Data);
			$data['error']=1;
			return $data;
			exit;
		}
		$wei_user_Model=M('user','wei_');
        $exist=$wei_user_Model->where(array('openid'=>$return['openid']))->find();
		if($exist){
            $save=array(
				'unionid'=>$unionid_Data['unionId'],
                'session_key'=>$return['session_key'],
				'expires_in'=>$return['expires_in'],
                'dateline'=>time()
            );
            $is_save=$wei_user_Model->where(array('openid'=>$return['openid']))->data($save)->save();
        }else{
            $add=array(
				'openid'=>$return['openid'],
                'unionid'=>$unionid_Data['unionId'],
				'session_key'=>$return['session_key'],
                'expires_in'=>$return['expires_in'],
				'dateline'=>time()
			);
			$is_add=$wei_user_Model->data($add)->add();
        }
        if($is_save||$is_add){
            $wei_user_Data=$wei_user_Model->where(array('openid'=>$return['openid']))->find();
			$this->setSession($return['session_key']);
            $data['session']=session('session');
			$data['expires']=time()+$return['expires_in'];
			$data['error']=0;
        }else{
            $data['errmsg']="入库失败！";
			$data['error']=1;
        }
        return $data;
	}
	//设置session
	private function setSession($session){
        if(!empty($session)){ 
			session('session',$session);
		}
	}
	//发送code授权
	private function getOAuth($code){
        $url=';
		$data=array(
            'appid'=>'wx888888888',//填写你自己的
            'secret'=>'88888888888888',//填写你自己的
            'js_code'=>$code,
			'grant_type'=>'authorization_code'
		);
		$return=json_decode(https_request($url, $data),true);
        return $return;
	}
	//得到unionid 提交sessionKey、userinfo、
	private function getUnionID($sessionKey,$userInfo){
		if(!$userInfo['encryptedData']){
			return 'encryptedData为空';
			exit;
		}
		if(!$userInfo['iv']){
            return 'iv为空';
            exit;
        }
        vendor('wxBizDataCrypt.wxBizDataCrypt');//引入官方解密sdk
        $appid = 'wx88888888888888';//填写你自己的
        $encryptedData=$userInfo['encryptedData'];
        $iv = $userInfo['iv'];
        $pc = new \WXBizDataCrypt($appid, $sessionKey);
		$errCode = $pc->decryptData($encryptedData, $iv, $data );
        if ($errCode == 0) {
			return $data;
		} else {
			return $errCode;
        }
    }
}