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   1  <?php
   2  /**
   3   * Random_* Compatibility Library
   4   * for using the new PHP 7 random_* API in PHP 5 projects
   5   *
   6   * The MIT License (MIT)
   7   *
   8   * Copyright (c) 2015 - 2018 Paragon Initiative Enterprises
   9   *
  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 (!is_callable('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 bool      $fail_open Set to true to not throw an exception
  42       *
  43       * @return float|int
  44       * @psalm-suppress InvalidReturnType
  45       *
  46       * @throws TypeError
  47       */
  48      function RandomCompat_intval($number, $fail_open = false)
  49      {
  50          if (is_int($number) || is_float($number)) {
  51              $number += 0;
  52          } elseif (is_numeric($number)) {
  53              /** @psalm-suppress InvalidOperand */
  54              $number += 0;
  55          }
  56          /** @var int|float $number */
  57  
  58          if (
  59              is_float($number)
  60                  &&
  61              $number > ~PHP_INT_MAX
  62                  &&
  63              $number < PHP_INT_MAX
  64          ) {
  65              $number = (int) $number;
  66          }
  67  
  68          if (is_int($number)) {
  69              return (int) $number;
  70          } elseif (!$fail_open) {
  71              throw new TypeError(
  72                  'Expected an integer.'
  73              );
  74          }
  75          return $number;
  76      }
  77  }