1: <?php
 2: /**
 3:  * Wei Framework
 4:  *
 5:  * @copyright   Copyright (c) 2008-2015 Twin Huang
 6:  * @license     http://opensource.org/licenses/mit-license.php MIT License
 7:  */
 8: 
 9: namespace Wei\Validator;
10: 
11: /**
12:  * Check if the input is null
13:  *
14:  * @author      Twin Huang <twinhuang@qq.com>
15:  */
16: class Null extends BaseValidator
17: {
18:     protected $notNullMessage = '%name% must be null';
19: 
20:     protected $negativeMessage = '%name% must not be null';
21: 
22:     /**
23:      * {@inheritdoc}
24:      */
25:     protected function doValidate($input)
26:     {
27:         if (!is_null($input)) {
28:             $this->addError('notNull');
29:             return false;
30:         }
31: 
32:         return true;
33:     }
34: }
35: