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<?php
/**
* The Mixer strategy interface.
*
* All mixing strategies must implement this interface
*
* PHP version 5.3
*
* @category PHPPasswordLib
* @package Hash
* @author Anthony Ferrara <ircmaxell@ircmaxell.com>
* @copyright 2011 The Authors
* @license http://www.opensource.org/licenses/mit-license.html MIT License
* @version Build @@version@@
*/
namespace SecurityLib;
/**
* The Utility trait.
*
* Contains methods used internally to this library.
*
* @category PHPPasswordLib
* @package Random
* @author Scott Arciszewski <scott@arciszewski.me>
* @license http://www.opensource.org/licenses/mit-license.html MIT License
* @codeCoverageIgnore
*/
abstract class Util {
/**
* Return the length of a string, even in the presence of
* mbstring.func_overload
*
* @param string $string the string we're measuring
* @return int
*/
public static function safeStrlen($string)
{
if (\function_exists('mb_strlen')) {
return \mb_strlen($string, '8bit');
}
return \strlen($string);
}
/**
* Return a string contained within a string, even in the presence of
* mbstring.func_overload
*
* @param string $string The string we're searching
* @param int $start What offset should we begin
* @param int|null $length How long should the substring be?
* (default: the remainder)
* @return string
*/
public static function safeSubstr($string, $start = 0, $length = null)
{
if (\function_exists('mb_substr')) {
return \mb_substr($string, $start, $length, '8bit');
} elseif ($length !== null) {
return \substr($string, $start, $length);
}
return \substr($string, $start);
}
}
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