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- 06.01.2017
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cast_to_int.php
01 <?php
02 /**
03 * Random_* Compatibility Library
04 * for using the new PHP 7 random_* API in PHP 5 projects
05 *
06 * The MIT License (MIT)
07 *
08 * Copyright (c) 2015 Paragon Initiative Enterprises
09 *
10 * Permission is hereby granted, free of charge, to any person obtaining a copy
11 * of this software and associated documentation files (the "Software"), to deal
12 * in the Software without restriction, including without limitation the rights
13 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
14 * copies of the Software, and to permit persons to whom the Software is
15 * furnished to do so, subject to the following conditions:
16 *
17 * The above copyright notice and this permission notice shall be included in
18 * all copies or substantial portions of the Software.
19 *
20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
21 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
23 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
24 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
25 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
26 * SOFTWARE.
27 */
28
29 if (!function_exists('RandomCompat_intval')) {
30
31 /**
32 * Cast to an integer if we can, safely.
33 *
34 * If you pass it a float in the range (~PHP_INT_MAX, PHP_INT_MAX)
35 * (non-inclusive), it will sanely cast it to an int. If you it's equal to
36 * ~PHP_INT_MAX or PHP_INT_MAX, we let it fail as not an integer. Floats
37 * lose precision, so the <= and => operators might accidentally let a float
38 * through.
39 *
40 * @param int|float $number The number we want to convert to an int
41 * @param boolean $fail_open Set to true to not throw an exception
42 *
43 * @return int (or float if $fail_open)
44 *
45 * @throws TypeError
46 */
47 function RandomCompat_intval($number, $fail_open = false)
48 {
49 if (is_numeric($number)) {
50 $number += 0;
51 }
52
53 if (
54 is_float($number)
55 &&
56 $number > ~PHP_INT_MAX
57 &&
58 $number < PHP_INT_MAX
59 ) {
60 $number = (int) $number;
61 }
62
63 if (is_int($number) || $fail_open) {
64 return $number;
65 }
66
67 throw new TypeError(
68 'Expected an integer.'
69 );
70 }
71 }
72