Simple VK API Class

<?php
class VK {
    private $token;
    private $v;

    const URL = 'https://api.vk.com/method/';

    public function __construct($token, $v = '5.69') {
        $this->token = $token;
        $this->v = $v;
    }

    public function api($method, $params = array(), $obj = false) {
        if(!array_key_exists('access_token', $params)) $params['access_token'] = $this->token;
        if(!array_key_exists('v', $params)) $params['v'] = $this->v;

        $ch = curl_init(self::URL.$method);

        curl_setopt_array($ch, array(
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_POST => true,
            CURLOPT_POSTFIELDS => $params
        ));

        $resp = curl_exec($ch);
        curl_close($ch);

        return json_decode($resp, !$obj);
    }
}