//获取二维码并保存
public static function save_erweima($access_token,$xiaochengxu_path) {
    $post_url = "https://api.weixin.qq.com/cgi-bin/wxaapp/createwxaqrcode?access_token=$access_token";
    $width = '258';
    $post_data='{"path":"'.$xiaochengxu_path.'","width":'.$width.'}';
    $opts = array('http' =>
        array(
            'method'  => 'POST',
            'header'  => 'Content-type: application/json',
            'content' => $post_data
        )
    );
    $context = stream_context_create($opts);
    $result = file_get_contents($post_url, false, $context);
    $file_path = ROOT_PATH . 'public' . DS . 'upload';
    // $file_path = ROOT_PATH . 'public' . DS . 'upload' . DS . 'ewm';
    $bytes = file_put_contents($file_path, $result);
    return $bytes;
}

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