/**
* 检查access_token是否起作用
*/
public static function checkAccessToken()
{
if (self::$access_token_endtime === null || self::$access_token_endtime < time()) {
// 重新申请access_token
$json = file_get_contents(self::BASE_WEIXIN_URL . self::TOKEN_URL . "&appid=" . self::APPID . "&secret=" . self::APPSECRET);
if ($json) {
$result = json_decode($json, true);
self::$access_token = $result['access_token'];
self::$access_token_endtime = time() + $result['expires_in'];
}
}
}