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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\Security\Core\Util;
/**
* String utility functions.
*
* @author Fabien Potencier <fabien@symfony.com>
*/
class StringUtils
{
/**
* This class should not be instantiated
*/
private function __construct() {}
/**
* Compares two strings.
*
* This method implements a constant-time algorithm to compare strings.
*
* @param string $str1 The first string
* @param string $str2 The second string
*
* @return Boolean true if the two strings are the same, false otherwise
*/
public static function equals($str1, $str2)
{
if (strlen($str1) !== $c = strlen($str2)) {
return false;
}
$result = 0;
for ($i = 0; $i < $c; $i++) {
$result |= ord($str1[$i]) ^ ord($str2[$i]);
}
return 0 === $result;
}
}
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