function curlGet($url){$ch = curl_init();$header = "Accept-Charset: utf-8";curl_setopt($ch, CURLOPT_URL, $url);curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "GET");curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);curl_setopt($curl, CURLOPT_HTTPHEADER, $header);curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (compatible; MSIE 5.01; Windows NT 5.0)');curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);curl_setopt($ch, CURLOPT_AUTOREFERER, 1);curl_setopt($ch, CURLOPT_POSTFIELDS, $data);curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);$temp = curl_exec($ch);return $temp;}function checkAccessToken($appid,$appsecret){$condition = array('appid'=>$appid,'appsecret'=>$appsecret);$access_token_set=M('AccessToken')->where($condition)->find();//获取数据if($access_token_set){ //检查是否超时，超时了重新获取if($access_token_set['AccessExpires']>time()){//未超时，直接返回access_tokenreturn $access_token_set['access_token'];}else{//已超时，重新获取$url_get='https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid='.$appid.'&secret='.$appsecret;$json=json_decode(curlGet($url_get));$access_token=$json->access_token;$AccessExpires=time()+intval($json->expires_in);$data['access_token']=$access_token;$data['AccessExpires']=$AccessExpires;$result = M('AccessToken')->where($condition)->save($data);//更新数据if($result){return $access_token;}else{return $access_token;}}}else{/*数据库中无$appid,$appsecret对应的记录需要再做处理，如插入到数据库        return 0;*/}
}