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<?php |
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// +----------------------------------------------------------------------+ |
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// | PHP Version 4 | |
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// +----------------------------------------------------------------------+ |
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// | Copyright (c) 1997-2004 The PHP Group | |
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// +----------------------------------------------------------------------+ |
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// | This source file is subject to version 3.0 of the PHP license, | |
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// | that is bundled with this package in the file LICENSE, and is | |
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// | available at through the world-wide-web at | |
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// | http://www.php.net/license/3_0.txt. | |
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// | If you did not receive a copy of the PHP license and are unable to | |
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// | obtain it through the world-wide-web, please send a note to | |
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// | license@php.net so we can mail you a copy immediately. | |
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// +----------------------------------------------------------------------+ |
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// | Authors: Aidan Lister <aidan@php.net> | |
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// +----------------------------------------------------------------------+ |
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// |
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// $Id: bcinvert.php,v 1.2 2005/11/22 20:24:45 aidan Exp $ |
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/** |
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* Replace bcinvert() |
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* |
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* @category PHP |
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* @package PHP_Compat |
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* @link http://php.net/function.bcinvert |
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* @author Sara Golemon <pollita@php.net> |
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* @version $Revision: 1.2 $ |
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* @since PHP 5.2.0 |
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* @require PHP 4.0.4 (call_user_func_array) |
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*/ |
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if (!function_exists('bcinvert')) { |
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function bcinvert($a, $n) |
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{ |
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// Sanity check |
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if (!is_scalar($a)) { |
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user_error('bcinvert() expects parameter 1 to be string, ' . |
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gettype($a) . ' given', E_USER_WARNING); |
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return false; |
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} |
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if (!is_scalar($n)) { |
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user_error('bcinvert() expects parameter 2 to be string, ' . |
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gettype($n) . ' given', E_USER_WARNING); |
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return false; |
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} |
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$u1 = $v2 = '1'; |
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$u2 = $v1 = '0'; |
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$u3 = $n; |
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$v3 = $a; |
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while (bccomp($v3, '0')) { |
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$q0 = bcdiv($u3, $v3); |
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$t1 = bcsub($u1, bcmul($q0, $v1)); |
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$t2 = bcsub($u2, bcmul($q0, $v2)); |
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$t3 = bcsub($u3, bcmul($q0, $v3)); |
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$u1 = $v1; |
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$u2 = $v2; |
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$u3 = $v3; |
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$v1 = $t1; |
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$v2 = $t2; |
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$v3 = $t3; |
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} |
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if (bccomp($u2, '0') < 0) { |
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return bcadd($u2, $n); |
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} else { |
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return bcmod($u2, $n); |
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} |
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} |
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} |
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?> |