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   1  <?php
   2  
   3  /*
   4   * This file is part of the Symfony package.
   5   *
   6   * (c) Fabien Potencier <fabien@symfony.com>
   7   *
   8   * For the full copyright and license information, please view the LICENSE
   9   * file that was distributed with this source code.
  10   */
  11  
  12  namespace Symfony\Polyfill\Php54;
  13  
  14  /**
  15   * @author Nicolas Grekas <p@tchwork.com>
  16   *
  17   * @internal
  18   */
  19  final class Php54
  20  {
  21      public static function hex2bin($data)
  22      {
  23          $len = \strlen($data);
  24  
  25          if (null === $len) {
  26              return;
  27          }
  28          if ($len % 2) {
  29              trigger_error('hex2bin(): Hexadecimal input string must have an even length', E_USER_WARNING);
  30  
  31              return false;
  32          }
  33  
  34          return pack('H*', $data);
  35      }
  36  }