3 * Random_* Compatibility Library
4 * for using the new PHP 7 random_* API in PHP 5 projects
6 * The MIT License (MIT)
8 * Copyright (c) 2015 - 2018 Paragon Initiative Enterprises
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:
17 * The above copyright notice and this permission notice shall be included in
18 * all copies or substantial portions of the Software.
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
29 if (!is_callable('RandomCompat_strlen')) {
31 defined('MB_OVERLOAD_STRING')
33 ((int) ini_get('mbstring.func_overload')) & MB_OVERLOAD_STRING
36 * strlen() implementation that isn't brittle to mbstring.func_overload
38 * This version uses mb_strlen() in '8bit' mode to treat strings as raw
39 * binary rather than UTF-8, ISO-8859-1, etc
41 * @param string $binary_string
47 function RandomCompat_strlen($binary_string)
49 if (!is_string($binary_string)) {
51 'RandomCompat_strlen() expects a string'
55 return (int) mb_strlen($binary_string, '8bit');
60 * strlen() implementation that isn't brittle to mbstring.func_overload
62 * This version just used the default strlen()
64 * @param string $binary_string
70 function RandomCompat_strlen($binary_string)
72 if (!is_string($binary_string)) {
74 'RandomCompat_strlen() expects a string'
77 return (int) strlen($binary_string);
82 if (!is_callable('RandomCompat_substr')) {
85 defined('MB_OVERLOAD_STRING')
87 ((int) ini_get('mbstring.func_overload')) & MB_OVERLOAD_STRING
90 * substr() implementation that isn't brittle to mbstring.func_overload
92 * This version uses mb_substr() in '8bit' mode to treat strings as raw
93 * binary rather than UTF-8, ISO-8859-1, etc
95 * @param string $binary_string
97 * @param int|null $length (optional)
103 function RandomCompat_substr($binary_string, $start, $length = null)
105 if (!is_string($binary_string)) {
107 'RandomCompat_substr(): First argument should be a string'
111 if (!is_int($start)) {
113 'RandomCompat_substr(): Second argument should be an integer'
117 if ($length === null) {
119 * mb_substr($str, 0, NULL, '8bit') returns an empty string on
120 * PHP 5.3, so we have to find the length ourselves.
122 /** @var int $length */
123 $length = RandomCompat_strlen($binary_string) - $start;
124 } elseif (!is_int($length)) {
126 'RandomCompat_substr(): Third argument should be an integer, or omitted'
130 // Consistency with PHP's behavior
131 if ($start === RandomCompat_strlen($binary_string) && $length === 0) {
134 if ($start > RandomCompat_strlen($binary_string)) {
138 return (string) mb_substr(
139 (string) $binary_string,
149 * substr() implementation that isn't brittle to mbstring.func_overload
151 * This version just uses the default substr()
153 * @param string $binary_string
155 * @param int|null $length (optional)
161 function RandomCompat_substr($binary_string, $start, $length = null)
163 if (!is_string($binary_string)) {
165 'RandomCompat_substr(): First argument should be a string'
169 if (!is_int($start)) {
171 'RandomCompat_substr(): Second argument should be an integer'
175 if ($length !== null) {
176 if (!is_int($length)) {
178 'RandomCompat_substr(): Third argument should be an integer, or omitted'
182 return (string) substr(
183 (string )$binary_string,
189 return (string) substr(
190 (string) $binary_string,