/**
* @return bool|mixed
* @throws Exception
*/
private static function _getAccessToken()
{
$url = sprintf(self::$access_token_url, APPID, APPSECRET);
$accessToken = Util::get($url);
$accessToken = json_decode($accessToken, true);
if (!isset($accessToken['access_token'])) {
throw new Exception("获取ACCESS_TOKEN失败");
}
//缓存时间，用来判断access_token是否过期
$accessToken['atime'] = time();
$accessTokenJson = json_encode($accessToken);
//缓存基础access_token
S(self::$cache_id, $accessTokenJson);
return $accessToken;
}
/**
* 通过ticket换取二维码
*
* @param string $ticket 票据
* @param string $filepath 文件路径，如果存在，则会保存二维码到本地
* @return bool|mixed
* @see http://mp.weixin.qq.com/wiki/18/28fc21e7ed87bec960651f0ce873ef8a.html
*/
public static function getQrcodeByTicket($ticket, $filepath = '')
{
$query_url = sprintf(self::$show_qrcode_url, urlencode($ticket));
$qrcode = Util::get($query_url);
if (!empty($filepath)) {
file_put_contents($filepath, $qrcode);
}
return $qrcode;
}
