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<?php
/**
* This file is part of the Nette Framework (https://nette.org)
* Copyright (c) 2004 David Grudl (https://davidgrudl.com)
*/
declare(strict_types=1);
namespace Nette\Utils;
use Nette;
/**
* Secure random string generator.
*/
final class Random
{
use Nette\StaticClass;
/**
* Generates a random string of given length from characters specified in second argument.
* Supports intervals, such as `0-9` or `A-Z`.
*/
public static function generate(int $length = 10, string $charlist = '0-9a-z'): string
{
$charlist = preg_replace_callback(
'#.-.#',
fn(array $m): string => implode('', range($m[0][0], $m[0][2])),
$charlist,
);
$charlist = count_chars($charlist, mode: 3);
$chLen = strlen($charlist);
if ($length < 1) {
throw new Nette\InvalidArgumentException('Length must be greater than zero.');
} elseif ($chLen < 2) {
throw new Nette\InvalidArgumentException('Character list must contain at least two chars.');
}
$res = '';
for ($i = 0; $i < $length; $i++) {
$res .= $charlist[random_int(0, $chLen - 1)];
}
return $res;
}
}
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