用php生成微信公众号带参数的二维码demo

# 官方生成带参数的二维码具体说明：https://developers.weixin.qq.com/doc/offiaccount/Account_Management/Generating_a_Parametric_QR_Code.html

$appId = '';
$appSecret = '';
$member_id = 1;// 带的参数

// 带参数二维码图片url
$wx_code = cache('wx_code_'.$member_id);// 读取缓存
if(empty($wx_code)){
    $access_token = $this->getAccessToken($appId, $appSecret);
    $url       = 'https://api.weixin.qq.com/cgi-bin/qrcode/create?access_token='.$access_token;
    $post_data = '{"expire_seconds": 86400, "action_name": "QR_STR_SCENE", "action_info": {"scene": {"scene_str": "guanzhubangding_' . $member_id . '"}}}';// 临时二维码
    $result    = http_request($url, 'POST', $post_data);
    $data      = json_decode($result, true);
    $wx_code = 'https://mp.weixin.qq.com/cgi-bin/showqrcode?ticket=' . urlencode($data['ticket']);
    cache('wx_code_'.$member_id, $wx_code, 86400);// 保存缓存1天
}

print_r($wx_code);die;// 带参数的二维码图片url


// 获取微信公众号的access_token
function getAccessToken($appId, $appSecret){
	$token = cache($wx_access_token_cache_key);// 读取缓存
	// 没有的话就创建新的
	if (empty($token)){
	    $url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=".$appId."&secret=".$appSecret;
	    $result = json_decode(http_request($url));
	    $token = $result->access_token;
	    cache($wx_access_token_cache_key, $token, 7200);// 保存缓存2小时
	}
	return $token;
}

/**
 * CURL请求
 * @param $url 请求url地址
 * @param $method 请求方法 get post
 * @param null $postfields post数据数组
 * @param array $headers 请求header信息
 * @param bool|false $debug 调试开启 默认false
 * @return mixed
 */
function http_request($url, $method = "GET", $postfields = null, $headers = [])
{
    $method = strtoupper($method);
    $ci = curl_init();
    curl_setopt($ci, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_0);
    curl_setopt($ci, CURLOPT_USERAGENT, "Mozilla/5.0 (Windows NT 6.2; WOW64; rv:34.0) Gecko/20100101 Firefox/34.0");
    curl_setopt($ci, CURLOPT_CONNECTTIMEOUT, 60); /* 在发起连接前等待的时间，如果设置为0，则无限等待 */
    curl_setopt($ci, CURLOPT_TIMEOUT, 20); /* 设置cURL允许执行的最长秒数 */
    curl_setopt($ci, CURLOPT_RETURNTRANSFER, true);
    switch ($method) {
        case "POST":
            curl_setopt($ci, CURLOPT_POST, true);
            if (!empty($postfields)) {
                $tmpdatastr = is_array($postfields) ? http_build_query($postfields) : $postfields;
                curl_setopt($ci, CURLOPT_POSTFIELDS, $tmpdatastr);
            }
            break;
        default:
            curl_setopt($ci, CURLOPT_CUSTOMREQUEST, $method); 
            break;
    }
    $ssl = preg_match('/^https:\/\//i', $url) ? TRUE : FALSE;
    curl_setopt($ci, CURLOPT_URL, $url);
    if ($ssl) {
        curl_setopt($ci, CURLOPT_SSL_VERIFYPEER, FALSE); // https请求 不验证证书和hosts
        curl_setopt($ci, CURLOPT_SSL_VERIFYHOST, FALSE); // 不从证书中检查SSL加密算法是否存在
    }
    //curl_setopt($ci, CURLOPT_HEADER, true); /*启用时会将头文件的信息作为数据流输出*/
    curl_setopt($ci, CURLOPT_FOLLOWLOCATION, 1);
    curl_setopt($ci, CURLOPT_MAXREDIRS, 2);/*指定最多的HTTP重定向的数量，这个选项是和CURLOPT_FOLLOWLOCATION一起使用的*/
    curl_setopt($ci, CURLOPT_HTTPHEADER, $headers);
    curl_setopt($ci, CURLINFO_HEADER_OUT, true);
    $response = curl_exec($ci);
    $requestinfo = curl_getinfo($ci);
    $http_code = curl_getinfo($ci, CURLINFO_HTTP_CODE);
    curl_close($ci);
    return $response;
}