vk api auth&online

<?php
$login = 'login'; //Логин
$pass = 'pass'; //Пароль
$app = '2274003'; //id приложения для получения token
$key = 'hHbZxrka2uZ6jB1inYsH'; //secret key приложения


$acc_token_file='vk_acc_token.php';
$access_token = '';

load_token();
api('account.setOnline');

function load_token($reauth=false){
   global $access_token,$acc_token_file;
   if (!$reauth && file_exists($acc_token_file)) {
      $s=file_get_contents($acc_token_file);
      preg_match("/\[([a-f0-9]+)\]/", $s, $matches);
      if (!$matches[0]){
         load_token(true);
      } else {
         $access_token=$matches[1];
      }
   } else {
      auth_api();
      if ($access_token==""){
         echo "Auth Error";
      } else {
         file_put_contents($acc_token_file,'<?php if (!defined("vk_online")) die("x_X"); "['.$access_token.']";?>');
      }
   }
}


function curl( $url ) {
        $ch = curl_init( $url );
        curl_setopt( $ch, CURLOPT_RETURNTRANSFER, true );
        curl_setopt( $ch, CURLOPT_SSL_VERIFYHOST, false );
        curl_setopt( $ch, CURLOPT_SSL_VERIFYPEER, false );
        $response = curl_exec( $ch );
        curl_close( $ch );
        return $response;
}
function auth_api(){
   global $access_token,$app,$key,$login,$pass;
   $auth = curl( "https://oauth.vk.com/token?grant_type=password&client_id=$app&client_secret=$key&username=$login&password=$pass" ); //Авторизация
   $json = json_decode( $auth, true );
   $access_token = $json['access_token'];
}
function api($method){
   global $access_token;
   $r = curl("https://api.vk.com/method/$method?access_token=$access_token");
   $json = json_decode( $r, true );
   if ($json['error']){
      $code=$json['error']['error_code'];
      if ($code==4 || $code==3){
         load_token(true);
         api($method);
      } else {
         echo $r;
      }
   } else {
      echo $r;
   }
}

?>