MtRandomSource.class.php

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00001 <?php
00002 /***************************************************************************
00003  *   Copyright (C) 2007 by Anton E. Lebedevich                             *
00004  *                                                                         *
00005  *   This program is free software; you can redistribute it and/or modify  *
00006  *   it under the terms of the GNU Lesser General Public License as        *
00007  *   published by the Free Software Foundation; either version 3 of the    *
00008  *   License, or (at your option) any later version.                       *
00009  *                                                                         *
00010  ***************************************************************************/
00011 
00017     final class MtRandomSource extends Singleton implements RandomSource
00018     {
00022         public static function me()
00023         {
00024             return Singleton::getInstance(__CLASS__);
00025         }
00026         
00027         public function getBytes($numberOfBytes)
00028         {
00029             Assert::isPositiveInteger($numberOfBytes);
00030             
00031             $bytes = null;
00032             for ($i = 0; $i < $numberOfBytes; $i += 4) {
00033                 $bytes .= pack('L', mt_rand());
00034             }
00035             
00036             return substr($bytes, 0, $numberOfBytes);
00037         }
00038     }
00039 ?>