微信小程序&PHP 使用unique_id 多平台账号通用

小程序端获取数据:使用session_key 去获取uniqueid。

app.js

login: function () {
    var that = this;
    // 登录
    wx.login({
      success: res => {
        // 发送 res.code 到后台换取 openId, sessionKey
        wx.request({
          url: 'https://www******l/api/jscode2session.php',
          data: { code: res.code },
          method: 'POST',
          header: {
            'content-type': 'application/x-www-form-urlencoded'
          },
          success: function (data) {
            that.getUserInfo(data.data.data.user_info.session_key);//解码获取unionID
          }
        })
      }
    })
  },
  getUserInfo:function(sessionKey){
    var that = this
    wx.getUserInfo({
      success: res => {
        res.sessionKey = sessionKey
        // 可以将 res 发送给后台解码出 unionId
        wx.request({
          url: 'https://*****/api/aes_data.php',
          data: res,
          method: 'POST',
          header: {
            'content-type': 'application/x-www-form-urlencoded'
          },
          success: function (data) {
            //解码获取unionID
            that.globalData.userInfo = data.data
          }
        })
 
        // 由于 getUserInfo 是网络请求，可能会在 Page.onLoad 之后才返回
        // 所以此处加入 callback 以防止这种情况
        if (this.userInfoReadyCallback) {
          this.userInfoReadyCallback(res)
        }
      }
    })
  },

后台：

jscode2session.php 获取session_key

aes_data.php 使用session_key获取unique_id（使用微信提供的加密解密方式）

jscode2session.php

<?php
include_once('config.php');
$code = trim($_POST['code']);      //小程序端传来的登陆code
$url  = 'https://api.weixin.qq.com/sns/jscode2session?appid='.$appid.'&secret='.$secret.'&js_code='.$code.'&grant_type=authorization_code';   
$r =  curlN($url);
$r = json_decode($r,true);
$arr = array(
        'ret' => 1,
        'msg' => '操作成功',
        'data' => array(
            'user_info' => $r,
            )   
        );
echo json_encode($arr); 
 
function curlN($url,$data=null)
{   
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    $tmpInfo = curl_exec($ch);
    if (curl_errno($ch)) {
      return curl_error($ch);
    }
    curl_close($ch);
    return $tmpInfo;
}
?>

aes_data.php

<?php
include_once('config.php');
include_once('wxBizDataCrypt.php');
 
$appid          = $appid;
$sessionKey     = $_POST['sessionKey'];
$encryptedData  = $_POST['encryptedData'];
$iv             = $_POST['iv'];
$pc             = new WXBizDataCrypt($appid, $sessionKey);
$errCode = $pc->decryptData($encryptedData, $iv, $data );
if ($errCode == 0) {
    print($data . "\n");
} else {
    print($errCode . "\n");
}
 

wxBizDataCrypt.php

<?php
 
/**
 * 对微信小程序用户加密数据的解密示例代码.
 *
 * @copyright Copyright (c) 1998-2014 Tencent Inc.
 */
 
 
include_once "errorCode.php";
 
 
class WXBizDataCrypt
{
    private $appid;
    private $sessionKey;
 
    /**
     * 构造函数
     * @param $sessionKey string 用户在小程序登录后获取的会话密钥
     * @param $appid string 小程序的appid
     */
    public function __construct( $appid, $sessionKey)
    {
        $this->sessionKey = $sessionKey;
        $this->appid = $appid;
    }
 
 
    /**
     * 检验数据的真实性，并且获取解密后的明文.
     * @param $encryptedData string 加密的用户数据
     * @param $iv string 与用户数据一同返回的初始向量
     * @param $data string 解密后的原文
     *
     * @return int 成功0，失败返回对应的错误码
     */
    public function decryptData( $encryptedData, $iv, &$data )
    {
        if (strlen($this->sessionKey) != 24) {
            return ErrorCode::$IllegalAesKey;
        }
        $aesKey=base64_decode($this->sessionKey);
 
        
        if (strlen($iv) != 24) {
            return ErrorCode::$IllegalIv;
        }
        $aesIV=base64_decode($iv);
 
        $aesCipher=base64_decode($encryptedData);
 
        $result=openssl_decrypt( $aesCipher, "AES-128-CBC", $aesKey, 1, $aesIV);
 
        $dataObj=json_decode( $result );
        if( $dataObj  == NULL )
        {
            return ErrorCode::$IllegalBuffer;
        }
        if( $dataObj->watermark->appid != $this->appid )
        {
            return ErrorCode::$IllegalBuffer;
        }
        $data = $result;
        return ErrorCode::$OK;
    }
 
}
 
 

errorCode.php

<?php
 
/**
 * error code 说明.
 * <ul>
 *    <li>-41001: encodingAesKey 非法</li>
 *    <li>-41003: aes 解密失败</li>
 *    <li>-41004: 解密后得到的buffer非法</li>
 *    <li>-41005: base64加密失败</li>
 *    <li>-41016: base64解密失败</li>
 * </ul>
 */
class ErrorCode
{
    public static $OK = 0;
    public static $IllegalAesKey = -41001;
    public static $IllegalIv = -41002;
    public static $IllegalBuffer = -41003;
    public static $DecodeBase64Error = -41004;
}
 
?>