微信带场景参数的二维码生成与使用

public function access_token() {
try{
$token = Db::name(‘access_token‘)->where(‘id‘,2)->find();
if ($token[‘time‘]<time()) {
$url    = ‘https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=wxf9f65c0fd755d6db&secret=9b62ba0fcb44143f0111b58fa02e813e‘;
$token  = curl1(‘get‘, $url);
$token  = json_decode($token, true);
Db::name(‘access_token‘)->where(‘id‘,2)->update([
‘token‘ => $token[‘access_token‘],
‘time‘  => bcadd(time(), 7200)
]);
}else{
$token  = $token[‘token‘];
}
return $token;
}catch (\Exception $e){
echo $e->getMessage();
}
}

/**
* 生成二维码所需要的ticket
* 2021/5/22 13:47
*/
public function get_ticket() {
$token = $this->access_token();
$state = time().$this->two_letter(11);
$url = ‘https://api.weixin.qq.com/cgi-bin/qrcode/create?access_token=‘.$token;
$data[‘data‘] = json_encode([
‘expire_seconds‘    => 60,
‘action_name‘       => ‘QR_LIMIT_STR_SCENE‘,
‘action_info‘       => [
‘scene‘     =>  [
‘scene_str‘ => $state
]
]
]);
$ticket = curl1(‘post‘, $url, $data);
$ticket = json_decode($ticket, true);
return json_encode([‘ticket‘=>$ticket[‘ticket‘], ‘state‘=>$state]);
}

protected $token = ‘基本配置分配的token‘;
//校验
public function check() {
//从GET参数中读取三个字段的值
$signature = $_GET["signature"];
$timestamp = $_GET["timestamp"];
$nonce = $_GET["nonce"];
//读取预定义的TOKEN
$token = $this->token;
//对数组进行排序
$tmpArr = array($token, $timestamp, $nonce);
sort($tmpArr, SORT_STRING);
//对三个字段进行sha1运算
$tmpStr = implode($tmpArr);
$tmpStr = sha1($tmpStr);
//判断我方计算的结果是否和微信端计算的结果相符
//这样利用只有微信端和我方了解的token作对比,验证访问是否来自微信官方.
if ($tmpStr == $signature && $_GET["echostr"]) {
echo $_GET["echostr"];
exit;
} else {
$this->reponseMsg();
}
}
/**
* 接收推送消息
* 2021/5/24 15:36
*/
public function reponseMsg() {
$redis = new_redis();
$postStr = file_get_contents(‘php://input‘);    //获取到xml数据包
$postObj = simplexml_load_string($postStr);//转化成对象
switch ($postObj->MsgType) {
case ‘event‘:
//推送事件
if($postObj->Event == ‘subscribe‘){
//这里是扫描二维码事件
//用户未关注的情况
$openid = $postObj->FromUserName; //这里是用户的openid
$str = $postObj->EventKey;
//qrscene_123123   用户未关注的情况下KEY值: qrscene_为前缀，后面为二维码的参数值
$arr    = explode(‘_‘, $str);
$state  = end($arr);     //这里是state, redis的前缀
//剩下的代码就省略了, 根据实际需求来实现不同的功能.
$redis->set($state, $openid); //我这里是吧openid 存到redis里了
}else if($postObj->Event == ‘SCAN‘){
//这里是扫描二维码事件
//用户关注的情况
$openid = $postObj->FromUserName; //这里是用户的openid
$state = $postObj->EventKey;   //这里是推广者的id
//剩下的代码就省略了, 根据实际需求来实现不同的功能.
$redis->set($state, $openid);
}
break;
default:
$this->err(‘推送失败‘);
break;
}
}