PHP random_key

Posted 2021-05-14

function random_key($len, $readable = false, $hash = false)
{
	$key = '';

	if ($hash)
		$key = substr(sha1(uniqid(rand(), true)), 0, $len);
	else if ($readable)
	{
		$chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';

		for ($i = 0; $i < $len; ++$i)
			$key .= substr($chars, (mt_rand() % strlen($chars)), 1);
	}
	else
		for ($i = 0; $i < $len; ++$i)
			$key .= chr(mt_rand(33, 126));

	return $key;
}