最近遇到一个项目是关于微信公众号开发的。
公众号连接里点菜单，生成一个带二维码的专属海报，分享海报到好友或者朋友圈让好点点击，好友关注后算是助力成功，集够相应好友数获得奖励。
每一次好友助力，分享者都会收到消息，如果助力者之前没关注过公众号提示成功助力一人，关注过提醒助失败。
助力者也可以生成专属海报，形成闭环。

开发过程中主要用到对授权用户进行判断，用户是否关注过公众号，以及微信公众号消息接口。
下面记录下具体实现的代码。

<?php
/*
 * 模板消息发送，电脑端测试时需要手动填写openid 
 * 微信端会自动获取当前openid发送无需填写
 */
header("Content-type: text/html; charset=utf-8");
date_default_timezone_set("Asia/Shanghai");

$temp = new template();


//判断用户是否关注公众号
function issub($openid){

	$access_token = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=APPID&secret=SECRET";
    $access_msg = json_decode(file_get_contents($access_token));
    $token = $access_msg->access_token;
    $subscribe_msg = "https://api.weixin.qq.com/cgi-bin/user/info?access_token=$token&openid=$openid";
    $subscribe = json_decode(file_get_contents($subscribe_msg));
    $gzxx = $subscribe->subscribe;
    //
    if($gzxx === 1){
    	echo "已关注";
    }else{
    	echo "未关注请关注。<img src='/public/images/gzh.png' />";
 	}
	
}
if (strpos($_SERVER['HTTP_USER_AGENT'], 'MicroMessenger') !== false) {
    if (!empty($_GET['code'])) {
        $openid = $temp->GetOpenid();        
        issub($openid);
        if ($openid) {
            $result = $temp->sendMsg($openid);
            if ($result['errmsg'] == 'ok') {
                echo '<script>alert("发送成功!");</script>';
            } else {
                echo '发送失败!';
            }
        } else {
            echo '<script>alert("获取openID失败!");</script>';
        }
    } else {
        $temp->GET_Code();
    }
} else {
    echo '<script>alert("发送模板需要先获取openID!");</script>';
    $openid='orpdAwprTZvFaUwPDfW4WSanlZIk';
    $result = $temp->sendMsg($openid);
    if ($result['errmsg'] == 'ok') {
        echo '<script>alert("发送成功!");</script>';
    } else {
        echo '发送失败!' . $result['errmsg'];
    }
}
 
class template {
 
    public $appid = "APPID";
    public $secret = "SECRET";
 
    public function sendMsg($openid) {
 
        $url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=" . $this->appid . "&secret=" . $this->secret;
        //获取access_token
        $resultData = $this->https_getRequest($url);
        $access_token = $resultData["access_token"];
 
        //$openid = 'orpdAwprTZvFaUwPDfW4WSanlZIk';
        $templateid = '模板ID';
        $title = "标题";
        $data1 = "变量一";
        $data2 = "变量二";
        $data3 = "变量三";
        $data4 = date("Y年m月d日 H:i", time());
        $remark = "内容说明！";
 
        $url = "https://api.weixin.qq.com/cgi-bin/message/template/send?access_token=" . $access_token;
        /*
         * @miniprogram 跳小程序所需数据，不需跳小程序可不用传该数据
         * @appid       appid必须与发模板消息的公众号是绑定关联关系）
         * @pagepath    所需跳转到小程序的具体页面路径，支持带参数,（示例index?foo=bar）
         */
 
        $data = '{
           "touser":"' . $openid . '",
           "template_id":"' . $templateid . '",
           "url":"模板跳转网址", 
           "miniprogram":{
             "appid":"",
             "pagepath":""
           },         
           "data":{
                   "first": {
                       "value":"' . $title . '",
                       "color":"#7A378B"
                   },
                   "keyword1":{
                       "value":"' . $data1 . '",
                       "color":"#787878"
                   },
                   "keyword2": {
                       "value":"' . $data2 . '",
                       "color":"#787878"
                   },
                   "keyword3": {
                       "value":"' . $data3 . '",
                       "color":"#787878"
                   },
                   "keyword4": {
                       "value":"' . $data4 . '",
                       "color":"#787878"
                   },
                   "remark":{
                       "value":"' . $remark . '",
                       "color":"#C5C1AA"
                   }
           }
       }';
        $send = $this->https_request($url, $data);
        $send = json_decode($send, true);
        return $send;
    }
 
    //发起获得code值链接
    public function GET_Code() {
        $get_url = "https://open.weixin.qq.com/connect/oauth2/authorize?appid=" . $this->appid;
        $url = "http://" . $_SERVER['HTTP_HOST'] . $_SERVER['PHP_SELF'];
        header("location:" . $get_url . "&redirect_uri=" . $url . "&response_type=code&scope=snsapi_base&state=1#wechat_redirect");
    }
 
    //获取用户openid
    public function GetOpenid() {
        $get_token_url = 'https://api.weixin.qq.com/sns/oauth2/access_token?appid=' . $this->appid . '&secret=' . $this->secret . '&code=' . $_GET['code'] . '&grant_type=authorization_code';
        $json_obj = $this->https_getRequest($get_token_url);
        // $access_token = $json_obj['access_token'];
        return $json_obj['openid'];
    }
 
    /*
     * 获取数据
     */
 
    public function https_getRequest($url) {
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        $output = curl_exec($ch);
        curl_close($ch);
        $jsonData = json_decode($output, true);
        return $jsonData;
    }
 
    //通用数据处理方法发送模板消息
    public function https_request($url, $data = null) {
        $curl = curl_init();
        curl_setopt($curl, CURLOPT_URL, $url);
        curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, FALSE);
        curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, FALSE);
        if (!empty($data)) {
            curl_setopt($curl, CURLOPT_POST, 1);
            curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
        }
        curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
        $output = curl_exec($curl);
        curl_close($curl);
        return $output;
    }
 
}
?>

其它配制详见微信公众平台开发者文档呢。