PhpThumb::getInstance PHP Method

    public static function getInstance()
    {
        if (!self::$_instance instanceof self) {
            self::$_instance = new self();
        }
        return self::$_instance;
    }

 * 
 * @author Ian Selby <*****@*****.**>
 * @copyright Copyright (c) 2009 Gen X Design
 * @link http://phpthumb.gxdlabs.com
 * @license http://www.opensource.org/licenses/mit-license.php The MIT License
 * @version 3.0
 * @package PhpThumb
 * @filesource
 */
// define some useful constants
define('THUMBLIB_BASE_PATH', dirname(__FILE__));
define('THUMBLIB_PLUGIN_PATH', THUMBLIB_BASE_PATH . '/thumb_plugins/');
define('DEFAULT_THUMBLIB_IMPLEMENTATION', 'gd');
/**
 * Include the PhpThumb Class
 */
require_once THUMBLIB_BASE_PATH . '/PhpThumb.inc.php';
/**
 * Include the ThumbBase Class
 */
require_once THUMBLIB_BASE_PATH . '/ThumbBase.inc.php';
/**
 * Include the GdThumb Class
 */
require_once THUMBLIB_BASE_PATH . '/GdThumb.inc.php';
/**
 * PhpThumbFactory Object
 *