前言

小程序推送限制性较强，用户活跃度低几乎就无法推送，如张小龙设计的那般，用完就走(该接口将于2020/01/10下线，详见新的订阅消息文章)

代码

<?php

class PushService
{
    protected $touser;

    protected $template_id;

    protected $page;

    protected $form_id;

    protected $data;

    protected $emphasis_keyword;

    public function __construct($userOpenid, $formId, $page, $data, $emphasisKeyword = '')
    {
        $this->touser      = $userOpenid;
        $this->page        = $page;
        $this->form_id     = $formId
        $this->data        = $this->paramsDeal($data);
        $this->emphasis_keyword = $emphasisKeyword;
    }

    /**
     * 通知
     */
    public function someMsg($tmpId){
        $this->template_id = $tmpId;
        return $this->doPush();
    }

    /**
     * 发送推送
     * @return bool|mixed
     */
    public function doPush(){
        if(!$this->form_id){
            return false;
        }
        $pushData = [
            'touser' => $this->touser,
            'template_id' => $this->template_id,
            'page' => $this->page,
            'form_id' => $this->form_id,
            'data' => $this->data,
        ];

        if($this->emphasis_keyword){
            $pushData['emphasis_keyword'] = $this->emphasis_keyword;
        }

        $wx = new WeiXinService();
        $result = $wx->pushToUser(json_encode($pushData));

        return $result;
    }

    /**
     * 处理模版内容
     * @param $data
     * @return array
     */
    public function paramsDeal($data){
        $i = 1;
        $result = [];
        foreach ($data as $v){
            $result['keyword'.$i] = array(
                'value' => $v
            );
            $i++;
        }
        return $result;
    }
}

<?php

class WeiXinService
{
    /**
     * @var String appID 微信小程序AppID
     */
    protected $appID;

    /**
     * @var String AppSecret 微信小程序AppSecret
     */
    protected $appSecret;

    public function __construct()
    {
        $this->appID          = $this->config['appID'];
        $this->appSecret      = $this->config['appSecret'];
    }

    /**
    * 获取accessToken
    */
    public function getAccessToken(){
        $hashKey = md5($this->appID);

        $access_token = UtilCache::getCache($hashKey);
        if($access_token){
            return $access_token;
        }

        $url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=".$this->appID."&secret=".$this->appSecret;

        $result = json_decode(NnCommon::curlPost($url, []), true);
        if(!$result['access_token']){
            return '';
        }
        UtilCache::setCache($hashKey, $result['access_token'], 7000);
        return $result['access_token'];
    }

    /**
     * 小程序消息推送
     * @param $data
     * @return mixed
    */
    public function pushToUser($data){
        $url = "https://api.weixin.qq.com/cgi-bin/message/wxopen/template/send?access_token=".$this->getAccessToken();
        $res = json_decode(NnCommon::curlPost($url, $data, 1), true);
        return $res;
    }
}

$params = [];
$push = new PushService(****);
$res = push->someMsg($tplId);

前言

小程序授权分2步，第一步，前端获取code给后段，获得用户openid+sessionkey，第二步，用户点击授权按钮，拿到解密向量iv，加密数据encryptedData。后端通过sessionkey+iv+encryptedData，然后使用官方的解密方法（还需要小程序appid）。解密出用户的信息，如头像，昵称，unionid等