A wrapper for session management

Session.php

<?php
/**
 * Session.php
 *
 * @package Bolido
 * @author  Michael Pratt <pratt@hablarmierda.net>
 * @link    http://www.michael-pratt.com/
 * @license MIT
 */

namespace Session;

/**
 * This class wraps the $_SESSION superglobal
 *
 * @usage
 * $session = new Session();
 * $session->start();
 * $sessions->set('key', 'value');
 * if ($session->has('key)){
 *     echo $session->get('key');
 *     // value
 * }
 * $session->close();
 */
class Session
{
    /** @var string The name of the session */
    protected $name;

    /** @var bool Wether or not the session has been started */
    protected $started = false;

    /** @var array Configuration options */
    protected $options = array(
        'session.use_trans_sid' => false,
        'session.use_cookies' => true,
        'session.use_only_cookies' => true,
        'session.cookie_httponly' => true,
        'session.gc_probability' => '40',
        'session.gc_maxlifetime' => 2400,
        'arg_separator.output' => '&amp;',
        'url_rewriter.tags' => '',
    );

    /**
     * Constructs the session object.
     *
     * @param string $name The name of the session
     * @param array $options
     * @param string $url
     * @return void
     */
    public function __construct($name = 'PHPSESSID', array $options = array(), $url = null)
    {
        $this->name = strtoupper($name);
        $this->options = array_merge($this->options, $options);

        foreach ($this->options as $name => $setting) {
            @ini_set($name, $setting);
        }

        // Find the domain of the url for session cookie assignment
        if (!empty($url)){
            $host = parse_url($url, PHP_URL_HOST);
            if (!filter_var($host, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6) &&
                !filter_var($host, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4))
            {
                if (preg_match('~(?:[^\.]+\.)?([^\.]{2,}\..+)\z~i', $host, $domain) == 1)
                {
                    @ini_set('session.cookie_domain', '.' . $domain['1']);
                    session_set_cookie_params(0, '/', '.' . $domain['1']);
                }
            }
        }
    }

    /**
     * Sets a session variable.
     *
     * @param mixed $key   Session variable name
     * @param mixed $value Session variable value
     * @return null
     */
    public function set($key, $value)
    {
        $_SESSION[$key] = $value;
    }

    /**
     * Returns a session variable.
     *
     * @param mixed $key
     * @return mixed
     */
    public function get($key)
    {
        if (!$this->has($key)) {
            return false;
        }

        return $_SESSION[$key];
    }

    /**
     * Unsets a Session Key
     *
     * @param mixed $key
     * @return bool
     */
    public function delete($key)
    {
        if ($this->has($key)) {
            unset($_SESSION[$key]);
        }
    }

    /**
     * Checks whether a session variable exists.
     *
     * @param mixed $key
     * @return bool
     */
    public function has($key)
    {
        return isset($_SESSION[$key]);
    }

    /**
     * Resets all the session values
     * @return void
     */
    public function reset()
    {
        $_SESSION = array();
    }

    /**
     * Check whether the session has already been started.
     *
     * @return bool
     */
    public function isStarted()
    {
        return $this->started;
    }

    /**
     * Starts the sesssion.
     *
     * @return bool
     * @codeCoverageIgnore
     */
    public function start()
    {
        if ($this->started) {
            return false;
        }

        session_name($this->name);

        // For Testing Purposes.
        if (PHP_SAPI == 'cli')
        {
            $_SESSION = array();
            return $this->started = true;
        }
        else if (session_start()) {
            return $this->started = true;
        }

        return false;
    }

    /**
     * Sets the session name.
     *
     * @param string $name Session name
     * @return void
     */
    public function setName($name)
    {
        if (!$this->started) {
            $this->name = $name;
        }
    }

    /**
     * Returns the session name.
     *
     * @return string
     */
    public function getName()
    {
        return $this->name;
    }

    /**
     * Returns the sesssion id.
     *
     * @return mixed False on Error
     * @codeCoverageIgnore
     */
    public function getId()
    {
        if (!$this->started) {
            return false;
        }

        return session_id();
    }

    /**
     * Regenerate session id to make session fixation harder.
     *
     * @param bool $deletePrevious Wether the previous session should be deleted
     * @return void False on error
     * @codeCoverageIgnore
     */
    public function regenerateId($deletePrevious = false)
    {
        if (!$this->started) {
            return false;
        }

        session_regenerate_id($deletePrevious);
    }

    /**
     * Stores the session data and closes the session
     *
     * @return null
     * @codeCoverageIgnore
     */
    public function close()
    {
        session_write_close();
    }

    /**
     * Destroy the session.
     *
     * @return bool
     * @codeCoverageIgnore
     */
    public function destroy()
    {
        if (!$this->started) {
            return false;
        }

        $this->reset();
        session_destroy();

        $this->started = false;
        return setcookie($this->name, '', time() - 42000);
    }
}
?>

TestSession.php

<?php
/**
 * TestSession.php
 */

use Session\Session;

require 'Session.php';

class TestSession extends \PHPUnit_Framework_TestCase
{
    public function setUp()
    {
        $_SESSION = array();
    }

    public function testSetterGetter()
    {
        $session = new Session();
        $session->setName('CustomName');
        $this->assertTrue($session->start());
        $this->assertTrue($session->isStarted());
        $this->assertEquals($session->getName(), 'CustomName');

        $session = new Session();
        $this->assertTrue($session->start());
        $this->assertTrue($session->isStarted());
        $this->assertEquals($session->getName(), 'PHPSESSID');

        $session = new Session('PHPSESSID', array(), 'http://www.example.com');
        $this->assertTrue($session->start());
        $session->set('string_value', 'My Name is Bólido');
        $session->set('object_value', (object) array('My Object'));
        $session->set('array_value', array('1', '2', '3'));
        $this->assertEquals($session->get('string_value'), 'My Name is Bólido');
        $this->assertEquals($session->get('object_value'), (object) array('My Object'));
        $this->assertEquals($session->get('array_value'), array('1', '2', '3'));
        $this->assertTrue($session->has('string_value'));
        $this->assertTrue($session->has('object_value'));
        $this->assertTrue($session->has('array_value'));
        $this->assertFalse($session->has('unknown_key'));
        $this->assertFalse($session->has('other_unset_key'));
        $this->assertTrue($session->isStarted());
        $this->assertEquals($session->getName(), 'PHPSESSID');

        $session->reset();
        $this->assertFalse($session->has('string_value'));
        $this->assertFalse($session->has('object_value'));
        $this->assertFalse($session->has('array_value'));
        $this->assertFalse($session->has('unknown_key'));
        $this->assertFalse($session->has('other_unset_key'));

        $session = new Session('PHPSESSID', array(), '192.168.0.1');
        $this->assertTrue($session->start());
        $session->set('string_value', 'hellow');
        $session->set('object_value', (object) array('hi'));
        $session->set('array_value', array('1', '2', '3'));
        $this->assertEquals($session->get('string_value'), 'hellow');
        $this->assertEquals($session->get('object_value'), (object) array('hi'));
        $this->assertEquals($session->get('array_value'), array('1', '2', '3'));
        $this->assertTrue($session->has('string_value'));
        $this->assertTrue($session->has('object_value'));
        $this->assertTrue($session->has('array_value'));

        $session->delete('string_value');
        $session->delete('object_value');
        $session->delete('array_value');

        $this->assertFalse($session->has('string_value'));
        $this->assertFalse($session->has('object_value'));
        $this->assertFalse($session->has('array_value'));
    }
}
?>