Source of file Singleton.php

<?php

/**

 * Singleton Trait

 *

 * @category   PHP

 * @package    MvcLite

 * @subpackage Traits

 * @since      File available since release 3.0.x

 * @author     Cory Collier <corycollier@corycollier.com>

 */

namespace MvcLite\Traits;

/**

 * Singleton Trait.

 *

 * Allows getting a single instance of self.

 *

 * @category   PHP

 * @package    MvcLite

 * @subpackage Traits

 * @since      File available since release 3.0.x

 * @author     Cory Collier <corycollier@corycollier.com>

 */

trait Singleton

{

    /**

     * Static instance variable

     * @var Singleton

     */

    protected static $instance;

    /**

     * Privatizing the constructor to protect the singleton pattern.

     */

    private function __construct()

    {

    }

    /**

     * Getter for the instance variable.

     *

     * @return Singleton

     */

    public static function getInstance()

    {

        $self = get_called_class();

        if (!$self::$instance) {

            $self::$instance = new $self;

        }

        return $self::$instance;

    }

}