VK client api

class VK {
    static $predefined_params;

    public static function init ($predefined_params) {
        self::$predefined_params = $predefined_params;
    }
    public static function api ($method, $params) {
        $params = array_merge(self::$predefined_params, $params);

        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, "https://api.vk.com/method/{$method}");
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_POST, true);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $params);

        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_ENCODING, 'UTF-8');
        $response_raw = curl_exec($ch);
        curl_close($ch);

        $response = json_decode($response_raw, TRUE);
        return $response;
    }
}

// example
VK::init(array(
    'access_token' => $_GET['access_token'],
    'https' => 1,
    'v' => '5.24',
));
$response = VK::api("audio.get", array('owner_id' => $_GET['viewer_id']));