function getAccessToken(){
$appid="你的appid";
$appsecret = "你的appsecret";
$data=json_decode(get_php_file("access_token.php"));
if($data->expire_time<time()){
$url="https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=".$appid."&secret=".$appsecret;
$res=json_decode(httpGet($url));
$access_token=$res->access_token;
if($access_token){
$data->expire_time=time()+7000;
$data->access_token=$access_token;
set_php_file("access_token.php",json_encode($data));
}
}else{
$access_token=$data->access_token;
}
return $access_token;
}