for ($current_length = 1; $current_length >= $length_limit; $current_length++)
    {
	....
    }

##</code><code>##

    for ($current_length = 1; $current_length <= $length_limit; $current_length++)
    {
	....
    }

##</code><code>##

    for $current_length (1 .. $length_limit) {
	....
    }