微信小程序生成带参数的小程序二维码

官方提供生成小程序码的两种方式：https://developers.weixin.qq.com/miniprogram/dev/framework/open-ability/qr-code.html

https://developers.weixin.qq.com/miniprogram/dev/api-backend/open-api/qr-code/wxacode.getUnlimited.html

服务端生成小程序码

//小程序码
public function getWxcode()
{
    $ACCESS_TOKEN = $this->getWxAccessToken();
    $url = "https://api.weixin.qq.com/wxa/getwxacodeunlimit?access_token=" . $ACCESS_TOKEN['access_token'];
    $post_data =
        array(
            'page' => 'pages/my/my', //扫码跳转页面
            'scene' => input（'invite_code'） //用户邀请码
        );
    $post_data = json_encode($post_data);
    $data = $this->send_post($url, $post_data);
    $result = $this->data_uri($data, 'image/png');
    return '<image src='.$result.'></image>';
    //return $result;
}

private function getWxAccessToken()
{
    $appid = '******';
    $appsecret = '*******';
    $url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=" . $appid . "&secret=" . $appsecret;
    $access_token = $this->makeRequest($url);
    $access_token = json_decode($access_token['result'], true);
    return $access_token;

}

/**
 * 发起http请求
 * @param string $url 访问路径
 * @param array $params 参数，该数组多于1个，表示为POST
 * @param int $expire 请求超时时间
 * @param array $extend 请求伪造包头参数
 * @param string $hostIp HOST的地址
 * @return array    返回的为一个请求状态，一个内容
 */
private function makeRequest($url, $params = array(), $expire = 0, $extend = array(), $hostIp = '')
{
    if (empty($url)) {
        return array('code' => '100');
    }

    $_curl = curl_init();
    $_header = array(
        'Accept-Language: zh-CN',
        'Connection: Keep-Alive',
        'Cache-Control: no-cache'
    );
    // 方便直接访问要设置host的地址
    if (!empty($hostIp)) {
        $urlInfo = parse_url($url);
        if (empty($urlInfo['host'])) {
            $urlInfo['host'] = substr(DOMAIN, 7, -1);
            $url = "http://{$hostIp}{$url}";
        } else {
            $url = str_replace($urlInfo['host'], $hostIp, $url);
        }
        $_header[] = "Host: {$urlInfo['host']}";
    }

    // 只要第二个参数传了值之后，就是POST的
    if (!empty($params)) {
        curl_setopt($_curl, CURLOPT_POSTFIELDS, http_build_query($params));
        curl_setopt($_curl, CURLOPT_POST, true);
    }

    if (substr($url, 0, 8) == 'https://') {
        curl_setopt($_curl, CURLOPT_SSL_VERIFYPEER, FALSE);
        curl_setopt($_curl, CURLOPT_SSL_VERIFYHOST, FALSE);
    }
    curl_setopt($_curl, CURLOPT_URL, $url);
    curl_setopt($_curl, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($_curl, CURLOPT_USERAGENT, 'API PHP CURL');
    curl_setopt($_curl, CURLOPT_HTTPHEADER, $_header);

    if ($expire > 0) {
        curl_setopt($_curl, CURLOPT_TIMEOUT, $expire); // 处理超时时间
        curl_setopt($_curl, CURLOPT_CONNECTTIMEOUT, $expire); // 建立连接超时时间
    }

    // 额外的配置
    if (!empty($extend)) {
        curl_setopt_array($_curl, $extend);
    }

    $result['result'] = curl_exec($_curl);
    $result['code'] = curl_getinfo($_curl, CURLINFO_HTTP_CODE);
    $result['info'] = curl_getinfo($_curl);
    if ($result['result'] === false) {
        $result['result'] = curl_error($_curl);
        $result['code'] = -curl_errno($_curl);
    }

    curl_close($_curl);
    return $result;
}

/**
 * 消息推送http
 * @param $url
 * @param $post_data
 * @return bool|string
 */
private function send_post($url, $post_data)
{
    $options = array(
        'http' => array(
            'method' => 'POST',
            'header' => 'Content-type:application/json',
            //header 需要设置为 JSON
            'content' => $post_data,
            'timeout' => 60
            //超时时间
        )
    );
    $context = stream_context_create($options);
    $result = file_get_contents($url, false, $context);
    return $result;
}

//二进制转图片image/png
private function data_uri($contents, $mime)
{
    $base64 = base64_encode($contents);
    return ('data:' . $mime . ';base64,' . $base64);
}