PHP 31
Polyfills facebook Guest on 24th April 2021 11:17:12 PM
  1. <?php
  2. /**
  3.  * Copyright  Facebook, Inc.
  4.  *
  5.  * You are hereby granted a non-exclusive, worldwide, royalty-free license to
  6.  * use, copy, modify, and distribute this software in source code or binary
  7.  * form for use in connection with the web services and APIs provided by
  8.  * Facebook.
  9.  *
  10.  * As with any software that integrates with the Facebook platform, your use
  11.  * of this software is subject to the Facebook Developer Principles and
  12.  * Policies [http://developers.facebook.com/policy/]. This copyright notice
  13.  * shall be included in all copies or substantial portions of the software.
  14.  *
  15.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16.  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17.  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  18.  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19.  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20.  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21.  * DEALINGS IN THE SOFTWARE.
  22.  *
  23.  */
  24.  
  25. /**
  26.  * @see https://github.com/sarciszewski/php-future/blob/master/src/Security.php#L37-L51
  27.  */
  28. if (!function_exists('hash_equals')) {
  29.     function hash_equals($knownString, $userString)
  30.     {
  31.         if (function_exists('mb_strlen')) {
  32.             $kLen = mb_strlen($knownString, '8bit');
  33.             $uLen = mb_strlen($userString, '8bit');
  34.         } else {
  35.             $kLen = strlen($knownString);
  36.             $uLen = strlen($userString);
  37.         }
  38.         if ($kLen !== $uLen) {
  39.             return false;
  40.         }
  41.         $result = 0;
  42.         for ($i = 0; $i < $kLen; $i++) {
  43.             $result |= (ord($knownString[$i]) ^ ord($userString[$i]));
  44.         }
  45.  
  46.         // They are only identical strings if $result is exactly 0...
  47.         return 0 === $result;
  48.     }
  49. }

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