3 * Random_* Compatibility Library |
3 * Random_* Compatibility Library |
4 * for using the new PHP 7 random_* API in PHP 5 projects |
4 * for using the new PHP 7 random_* API in PHP 5 projects |
5 * |
5 * |
6 * The MIT License (MIT) |
6 * The MIT License (MIT) |
7 * |
7 * |
8 * Copyright (c) 2015 Paragon Initiative Enterprises |
8 * Copyright (c) 2015 - 2017 Paragon Initiative Enterprises |
9 * |
9 * |
10 * Permission is hereby granted, free of charge, to any person obtaining a copy |
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 |
11 * of this software and associated documentation files (the "Software"), to deal |
12 * in the Software without restriction, including without limitation the rights |
12 * in the Software without restriction, including without limitation the rights |
13 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
13 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
24 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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 |
25 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
26 * SOFTWARE. |
26 * SOFTWARE. |
27 */ |
27 */ |
28 |
28 |
29 if (!function_exists('RandomCompat_strlen')) { |
29 if (!is_callable('RandomCompat_strlen')) { |
30 if ( |
30 if ( |
31 defined('MB_OVERLOAD_STRING') && |
31 defined('MB_OVERLOAD_STRING') && |
32 ini_get('mbstring.func_overload') & MB_OVERLOAD_STRING |
32 ini_get('mbstring.func_overload') & MB_OVERLOAD_STRING |
33 ) { |
33 ) { |
34 /** |
34 /** |
71 if (!is_string($binary_string)) { |
71 if (!is_string($binary_string)) { |
72 throw new TypeError( |
72 throw new TypeError( |
73 'RandomCompat_strlen() expects a string' |
73 'RandomCompat_strlen() expects a string' |
74 ); |
74 ); |
75 } |
75 } |
76 return strlen($binary_string); |
76 return (int) strlen($binary_string); |
77 } |
77 } |
78 } |
78 } |
79 } |
79 } |
80 |
80 |
81 if (!function_exists('RandomCompat_substr')) { |
81 if (!is_callable('RandomCompat_substr')) { |
82 |
82 |
83 if ( |
83 if ( |
84 defined('MB_OVERLOAD_STRING') |
84 defined('MB_OVERLOAD_STRING') |
85 && |
85 && |
86 ini_get('mbstring.func_overload') & MB_OVERLOAD_STRING |
86 ini_get('mbstring.func_overload') & MB_OVERLOAD_STRING |
116 if ($length === null) { |
116 if ($length === null) { |
117 /** |
117 /** |
118 * mb_substr($str, 0, NULL, '8bit') returns an empty string on |
118 * mb_substr($str, 0, NULL, '8bit') returns an empty string on |
119 * PHP 5.3, so we have to find the length ourselves. |
119 * PHP 5.3, so we have to find the length ourselves. |
120 */ |
120 */ |
121 $length = RandomCompat_strlen($length) - $start; |
121 $length = RandomCompat_strlen($binary_string) - $start; |
122 } elseif (!is_int($length)) { |
122 } elseif (!is_int($length)) { |
123 throw new TypeError( |
123 throw new TypeError( |
124 'RandomCompat_substr(): Third argument should be an integer, or omitted' |
124 'RandomCompat_substr(): Third argument should be an integer, or omitted' |
125 ); |
125 ); |
126 } |
126 } |
127 |
127 |
128 return mb_substr($binary_string, $start, $length, '8bit'); |
128 // Consistency with PHP's behavior |
|
129 if ($start === RandomCompat_strlen($binary_string) && $length === 0) { |
|
130 return ''; |
|
131 } |
|
132 if ($start > RandomCompat_strlen($binary_string)) { |
|
133 return ''; |
|
134 } |
|
135 |
|
136 return (string) mb_substr($binary_string, $start, $length, '8bit'); |
129 } |
137 } |
130 |
138 |
131 } else { |
139 } else { |
132 |
140 |
133 /** |
141 /** |
162 throw new TypeError( |
170 throw new TypeError( |
163 'RandomCompat_substr(): Third argument should be an integer, or omitted' |
171 'RandomCompat_substr(): Third argument should be an integer, or omitted' |
164 ); |
172 ); |
165 } |
173 } |
166 |
174 |
167 return substr($binary_string, $start, $length); |
175 return (string) substr($binary_string, $start, $length); |
168 } |
176 } |
169 |
177 |
170 return substr($binary_string, $start); |
178 return (string) substr($binary_string, $start); |
171 } |
179 } |
172 } |
180 } |
173 } |
181 } |