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   1  <?php
   2  // +----------------------------------------------------------------------+

   3  // | PHP Version 4                                                        |

   4  // +----------------------------------------------------------------------+

   5  // | Copyright (c) 1997-2004 The PHP Group                                |

   6  // +----------------------------------------------------------------------+

   7  // | This source file is subject to version 3.0 of the PHP license,       |

   8  // | that is bundled with this package in the file LICENSE, and is        |

   9  // | available at through the world-wide-web at                           |

  10  // | http://www.php.net/license/3_0.txt.                                  |

  11  // | If you did not receive a copy of the PHP license and are unable to   |

  12  // | obtain it through the world-wide-web, please send a note to          |

  13  // | license@php.net so we can mail you a copy immediately.               |

  14  // +----------------------------------------------------------------------+

  15  // | Authors: Aidan Lister <aidan@php.net>                                |

  16  // +----------------------------------------------------------------------+

  17  //

  18  // $Id: str_shuffle.php,v 1.6 2005/08/14 03:24:16 aidan Exp $

  19  
  20  
  21  /**

  22   * Replace str_shuffle()

  23   *

  24   * @category    PHP

  25   * @package     PHP_Compat

  26   * @link        http://php.net/function.str_shuffle

  27   * @author      Aidan Lister <aidan@php.net>

  28   * @version     $Revision: 1.6 $

  29   * @since       PHP 4.3.0

  30   * @require     PHP 4.0.0 (user_error)

  31   */
  32  if (!function_exists('str_shuffle')) {
  33      function str_shuffle($str)
  34      {
  35          // Init

  36          $str = (string) $str;
  37  
  38          // Seed

  39          list($usec, $sec) = explode(' ', microtime());
  40          $seed = (float) $sec + ((float) $usec * 100000);
  41          mt_srand($seed);
  42  
  43          // Shuffle

  44          for ($new = '', $len = strlen($str); $len > 0; $str{$p} = $str{$len}) { 
  45              $new .= $str{$p = mt_rand(0, --$len)};
  46          }
  47  
  48          return $new;
  49      }
  50  }
  51  
  52  ?>