<?php
/**
* This file is part of the PHP Generics package.
*
* @package Generics
*/
namespace Generics\Util;
/**
* This utility class helps to generate a random string
*
* @author Maik Greubel <greubel@nkey.de>
*
*/
class RandomString
{
/**
* ISO Characters
*
* @final
*
*/
const ISO = 1;
/**
* ASCII Characters
*
* @final
*
*/
const ASCII = 2;
/**
* Generate a random string with specific length
*
* @param number $length
* The length of string to generate
* @param int $allowed
* Type of allowed characters
* @param boolean $repeatable
* Whether a character may be reused
*
* @return string The generated string
*/
public static function generate($length = 8, $allowed = RandomString::ASCII, $repeatable = true): string
{
$allowedChars = array();
$currentLocale = setlocale(LC_ALL, "0");
if ($allowed == RandomString::ASCII) {
setlocale(LC_ALL, "C");
}
for ($i = 32; $i < 256; $i ++) {
if (($allowed == RandomString::ASCII && ! ctype_alnum(chr($i))) || (! ctype_print(chr($i)))) {
continue;
}
$allowedChars[] = $i;
}
self::resetLocaleTo($currentLocale);
$used = array();
$string = "";
$i = $length;
while ($i > 0) {
$index = mt_rand(0, count($allowedChars) - 1);
if (! $repeatable && in_array($index, $used)) {
continue;
}
$string .= chr($allowedChars[$index]);
$used[] = $i;
$i --;
}
return $string;
}
/**
* Reset the locale settings back to saved vars
*
* @param string $localeSaved
* String containing the locale infos obtained using setlocale(LC_ALL, '');
*/
private static function resetLocaleTo($localeSaved)
{
$localeData = explode(';', $localeSaved);
foreach ($localeData as $identifier) {
if (! strchr($identifier, '=')) {
continue;
}
$type = $value = null;
sscanf($identifier, "%s=%s", $type, $value);
switch ($type) {
case 'LC_ALL':
setlocale(LC_ALL, $value);
break;
case 'LC_COLLATE':
setlocale(LC_COLLATE, $value);
break;
case 'LC_CTYPE':
setlocale(LC_CTYPE, $value);
break;
case 'LC_MONETARY':
setlocale(LC_MONETARY, $value);
break;
case 'LC_NUMERIC':
setlocale(LC_NUMERIC, $value);
break;
case 'LC_TIME':
setlocale(LC_TIME, $value);
break;
case 'LC_MESSAGES':
setlocale(LC_MESSAGES, $value);
break;
default:
;
break;
}
}
}
}
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