|
1
|
|
|
<?php |
|
2
|
|
|
|
|
3
|
|
|
/** |
|
4
|
|
|
* Copyright (c) 2016-present Ganbaro Digital Ltd |
|
5
|
|
|
* All rights reserved. |
|
6
|
|
|
* |
|
7
|
|
|
* Redistribution and use in source and binary forms, with or without |
|
8
|
|
|
* modification, are permitted provided that the following conditions |
|
9
|
|
|
* are met: |
|
10
|
|
|
* |
|
11
|
|
|
* * Redistributions of source code must retain the above copyright |
|
12
|
|
|
* notice, this list of conditions and the following disclaimer. |
|
13
|
|
|
* |
|
14
|
|
|
* * Redistributions in binary form must reproduce the above copyright |
|
15
|
|
|
* notice, this list of conditions and the following disclaimer in |
|
16
|
|
|
* the documentation and/or other materials provided with the |
|
17
|
|
|
* distribution. |
|
18
|
|
|
* |
|
19
|
|
|
* * Neither the names of the copyright holders nor the names of his |
|
20
|
|
|
* contributors may be used to endorse or promote products derived |
|
21
|
|
|
* from this software without specific prior written permission. |
|
22
|
|
|
* |
|
23
|
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
|
24
|
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
|
25
|
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
|
26
|
|
|
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
|
27
|
|
|
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
|
28
|
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
|
29
|
|
|
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
|
30
|
|
|
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
|
31
|
|
|
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
|
32
|
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN |
|
33
|
|
|
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
|
34
|
|
|
* POSSIBILITY OF SUCH DAMAGE. |
|
35
|
|
|
* |
|
36
|
|
|
* @category Libraries |
|
37
|
|
|
* @package MissingBits/TypeChecks |
|
38
|
|
|
* @author Stuart Herbert <[email protected]> |
|
39
|
|
|
* @copyright 2016-present Ganbaro Digital Ltd www.ganbarodigital.com |
|
40
|
|
|
* @license http://www.opensource.org/licenses/bsd-license.php BSD License |
|
41
|
|
|
* @link http://ganbarodigital.github.io/php-the-missing-bits |
|
42
|
|
|
*/ |
|
43
|
|
|
|
|
44
|
|
|
namespace GanbaroDigital\MissingBits\TypeChecks; |
|
45
|
|
|
|
|
46
|
|
|
use GanbaroDigital\MissingBits\Checks\Check; |
|
47
|
|
|
|
|
48
|
|
|
/** |
|
49
|
|
|
* do we have something that is a NULL value? |
|
50
|
|
|
*/ |
|
51
|
|
|
class IsNull implements Check |
|
52
|
|
|
{ |
|
53
|
|
|
/** |
|
54
|
|
|
* fluent-interface entry point |
|
55
|
|
|
* |
|
56
|
|
|
* we do not support any customisations |
|
57
|
|
|
* |
|
58
|
|
|
* @return IsNull |
|
59
|
|
|
*/ |
|
60
|
|
|
public static function using() |
|
61
|
|
|
{ |
|
62
|
|
|
return new static; |
|
63
|
|
|
} |
|
64
|
|
|
|
|
65
|
|
|
/** |
|
66
|
|
|
* do we have something that is null? |
|
67
|
|
|
* |
|
68
|
|
|
* @param mixed $fieldOrVar |
|
69
|
|
|
* the item to be checked |
|
70
|
|
|
* @return bool |
|
71
|
|
|
* TRUE if the item is null |
|
72
|
|
|
* FALSE otherwise |
|
73
|
|
|
*/ |
|
74
|
|
|
public static function check($fieldOrVar) |
|
75
|
|
|
{ |
|
76
|
|
|
// general cases |
|
77
|
|
|
if ($fieldOrVar === NULL) { |
|
78
|
|
|
return true; |
|
79
|
|
|
} |
|
80
|
|
|
|
|
81
|
|
|
// if we get here, we have run out of ideas |
|
82
|
|
|
return false; |
|
83
|
|
|
} |
|
84
|
|
|
|
|
85
|
|
|
/** |
|
86
|
|
|
* do we have something that is null? |
|
87
|
|
|
* |
|
88
|
|
|
* @param mixed $fieldOrVar |
|
89
|
|
|
* the item to be checked |
|
90
|
|
|
* @return bool |
|
91
|
|
|
* TRUE if the item is null |
|
92
|
|
|
* FALSE otherwise |
|
93
|
|
|
*/ |
|
94
|
|
|
public function inspect($fieldOrVar) |
|
95
|
|
|
{ |
|
96
|
|
|
return static::check($fieldOrVar); |
|
97
|
|
|
} |
|
98
|
|
|
} |
|
99
|
|
|
|
ganbarodigital /
php-the-missing-bits
