<?php

$object = new TestLogin('https://www.balatarin.com/sessions', 'i886318', 'i886318@mvrht.net');

$object->login();

$object->getContent('https://www.balatarin.com/users/i886318');

function __autoload($class)
{
    if(file_exists($class.'.php'))
    {
        require_once $class.'.php';
    }
    else
    {
        die($class. ' class does not exists.');
    }
}
die;

<?php

class TestLogin extends General implements ICurl
{
    public function __construct($loginUrl, $username, $password)
    {
        $this->loginUrl = $loginUrl;
        $this->username = $username;
        $this->password = $password;

        parent::__construct();
    }

    public function login()
    {
        if(!$this->isLogin())
        {
            $response = curl_exec($this->curl);

            if(curl_errno($this->curl)) die(curl_error($this->curl));

            curl_setopt($this->curl, CURLOPT_RETURNTRANSFER, false);
            curl_setopt($this->curl, CURLOPT_POST, true);

            /* params */
            $params = array(
                'session[login]' => $this->username,
                'session[password]' => $this->password,
                'session[remember_me]' => '1',
                'commit' => 'ورود',
                'utf8' => '✓',
                'authenticity_token' => '',
            );

            /* create http query */
            curl_setopt($this->curl, CURLOPT_POSTFIELDS, http_build_query($params));

            $login = curl_exec($this->curl);

            $_SESSION['loggedIn'] = ($login === true ? true : false);

            return $login;
        }
        else
        {
            return true;
        }
    }

    public function getContent($url)
    {
        if($this->isLogin())
        {

            curl_setopt($this->curl, CURLOPT_RETURNTRANSFER, true);
            curl_setopt($this->curl, CURLOPT_BINARYTRANSFER, true);

            curl_setopt($this->curl, CURLOPT_URL, $url);

            $content = curl_exec($this->curl);

            if (curl_errno($this->curl)) print curl_error($this->curl);
            curl_close($this->curl);

            echo 'start<br />';
            echo($content);
            echo '<br />end<br />';
        }
        else
        {
            return null;
        }
    }
}

<?php
class General
{
    protected $curl;

    protected $loginUrl;

    protected $username;

    protected $password;

    private $cookiePath = __DIR__;

    private $subClassName;

    public function __construct()
    {
        session_start();

        $this->subClassName = get_called_class();

        $this->curl = curl_init();

        //Set the useragent
        curl_setopt($this->curl, CURLOPT_USERAGENT, $_SERVER["HTTP_USER_AGENT"]);

        /* set login url */
        curl_setopt($this->curl, CURLOPT_URL, $this->loginUrl);

        /* set cookie */
        curl_setopt($this->curl, CURLOPT_COOKIEJAR, $this->cookiePath."\".$this->subClassName.'_cookie.txt');
        curl_setopt($this->curl, CURLOPT_COOKIEFILE, $this->cookiePath."\".$this->subClassName.'_cookie.txt');

        curl_setopt($this->curl, CURLOPT_RETURNTRANSFER, true);

        // for ssl
        //curl_setopt($this->curl, CURLOPT_SSL_VERIFYPEER, FALSE);
    }

    protected function isLogin()
    {
        return (isset($_SESSION['loggedIn']) && $_SESSION['loggedIn'] === true);
    }

    public function logout()
    {
        $cookiePath = $this->cookiePath.'\'.$this->subClassName.'_cookie.txt';

        unset($_SESSION['loggedIn']);

        if(file_exists($cookiePath)) unlink($cookiePath);
    }

    public function __destruct()
    {
        curl_close($this->curl);
    }
}

<?php

interface ICurl
{
    public function login();

    public function getContent($url);
}