GN21Cookie Managment

example.php

<?php

require_once 'gn21cookie.php';

//Encrypt and set the cookie
\GN21Session::encrypt( array(
  'networkId'=>123,
  'membershipLevel'=>'gold',
  'clubId'=>2,
), true);

//Grabs content from cookie and decrypts it:
$fields = \GN21Session::decrypt();

//keep session alive - keeps renewing expiry
\GN21Session::keepalive();

//kill the session
\GN21Session::expire();

gn21cookie.php

<?php

class GN21Session {
	
	protected static $key = "f1c67bd9a01b3d10bcd717ec2baaf0c1";
	protected static $cookie_name = "gn21_session";
  	protected static $cookie_path = "/";
  	protected static $cookie_domain = "golfcanada.ca";
  	protected static $cookie_expire = "+30 minutes";
	
	/**
	 * Session properties into json encrypted string
	 */
	public static function encrypt ( array $payload, $set_cookie = false ) {
		$payload = json_encode($payload);
		$encrypted = base64_encode(mcrypt_encrypt(MCRYPT_RIJNDAEL_256, md5(self::$key), $payload, MCRYPT_MODE_CBC, md5(md5(self::$key))));
		if ($set_cookie) {
			self::set($encrypted);
		}
		return $encrypted;
	}
	
	/**
	 * Extract encrypted session var
	 */
	public static function decrypt ( $encrypted_payload = null) {
		if (is_null($encrypted_payload)) {
			$encrypted_payload = self::get();
		}
		
		$json_string = rtrim(mcrypt_decrypt(MCRYPT_RIJNDAEL_256, md5(self::$key), base64_decode($encrypted_payload), MCRYPT_MODE_CBC, md5(md5(self::$key))), "\0");
		$json = json_decode($json_string, true);
		return $json;
	}
	
	/**
	 * Expire cookie
	 */
	public static function expire () {
		setcookie(self::$cookie_name, "", strtotime("-1 minute"), self::$cookie_path, self::$cookie_domain );
	}
	
	/**
	 * Set the cookie data
	 */
	public static function set ( $encrypted, $cookie_expire = null ) {
    		if ( is_null($cookie_expire) ) {
      			$cookie_expire = self::$cookie_expire;
    		}
		setcookie(self::$cookie_name, $encrypted, strtotime($cookie_expire), self::$cookie_path, self::$cookie_domain );
	}
	
	/**
	 * Get the data from the cookie
	 */
	public static function get () {
    		if ( array_key_exists(self::$cookie_name, $_COOKIE) ) {
      			return $_COOKIE[self::$cookie_name];  
    		}
    		return null;
	}
  
  	/**
   	 * KeepAlive - Updates the expire time
   	 */
  	public static function keepalive () {
    		self::set( self::get() );
  	}
}