| 1 | <?php |
| 2 | /* |
| 3 | * $Id: Null.php 2963 2007-10-21 06:23:59Z Jonathan.Wage $ |
| 4 | * |
| 5 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 6 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 7 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 8 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 9 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 10 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 11 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 12 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 13 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 14 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 15 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 16 | * |
| 17 | * This software consists of voluntary contributions made by many individuals |
| 18 | * and is licensed under the LGPL. For more information, see |
| 19 | * <http://www.phpdoctrine.org>. |
| 20 | */ |
| 21 | |
| 22 | /** |
| 23 | * Doctrine_Null |
| 24 | * |
| 25 | * Simple empty class representing a null value |
| 26 | * used for extra fast null value testing with isset() rather than array_key_exists() |
| 27 | * |
| 28 | * @package Doctrine |
| 29 | * @subpackage Null |
| 30 | * @license http://www.opensource.org/licenses/lgpl-license.php LGPL |
| 31 | * @link www.phpdoctrine.org |
| 32 | * @since 1.0 |
| 33 | * @version $Revision: 2963 $ |
| 34 | * @author Konsta Vesterinen <kvesteri@cc.hut.fi> |
| 35 | */ |
| 36 | final class Doctrine_Null |
| 37 | { |
| 38 | public function exists() |
| 39 | { |
| 40 | return false; |
| 41 | } |
| 42 | public function __toString() |
| 43 | { |
| 44 | return ''; |
| 45 | } |
| 46 | } |