/**
* 获取access_token
*/
public function getAccessToken()
{
static $url = 'https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=%s&secret=%s';
$token = Utility::getAccessToken($this);
if (empty($token) || time() > $token['expired']) {
$body = Utility::http(sprintf($url, $this->getConfig('appid'), $this->getConfig('appsecret')));
$json = json_decode($body, true);
if (!$json || !empty($json['errcode'])) {
throw new Exception('Error - WeChat Can not get AccessToken.');
} else {
$token['token'] = $json['access_token'];
$token['expired'] = time() + $json['expires_in'] - 120;
Utility::setAccessToken($token, $this);
}
}
return $token['token'];
}
