[thelist] Logic headache

[Paul Roub]

Two loops, nested.  The first counts from 1 to $maxlevels -- the level which
you are excluding at this time.

The inner loop loops through the same list, building the *included* list for
each level.

Something like:

    <select name="exclude">
    <option value="">All levels</option>

    <?php

    $maxlevels = 4;  // per your example

    for ($curlevel = 1; $curlevel <= $maxlevels; ++$curlevel)
    {
        $leveldesc = "Level $curlevel";

        $valuestr = "";

        for ($listlevel = 1; $listlevel <= $maxlevels; ++$listlevel)
        {
            if ($listlevel != $curlevel)
            {
                if ($valuestr != '')
                {
                    $valuestr .= "|";
                }

                $valuestr .= "/lvl$listlevel/";
            }
        }

        print "<option value='$valuestr'>$leveldesc</option>\n";
    }

     ?>

    </option>




----- Original Message -----
From: "Tony Crockford" <tonyc at boldfish.co.uk>
To: "Thelist at lists. evolt. org" <thelist at lists.evolt.org>
Sent: Monday, November 11, 2002 10:09 AM
Subject: [thelist] Logic headache


> Hi all,
>
> brief explanation:
>
> I'm building a select list in PHP, to exclude certain directories from a
> search
> (with Ht://dig).
>
> The structure is like this:
> <select name="exclude">
> <option value="">All levels</option>
> <option value="/lv2/|/lv3/|/lv4/">Level 1</option>
> <option value="/lv1/|/lv3/|/lv4/">Level 2</option>
> <option value="/lv1/|/lv2/|/lv4/">Level 3</option>
> <option value="/lv1/|/lv2/|/lv3/">Level 4</option>
> </select>
>
> for four levels, where the option value should be all lv's except the
> current option level.
>
> I have a variable $maxlevels to count up to however many levels are
> required and  I want to make this select list work based on the value of
> $maxlevels.
>
> How would you approach the building of the list?
>
> I was going to use a while loop or two, but I'm stuck at the point of
> creating the value "string" which should contain all the levels from 1
> to $maxlevels except the current level. which would seem to require some
> sort of conditional "if $thislevel string is" type of approach, but I
> can't get my head round it.
>
> Anyone put me out of my misery?
>
> Thanks
>
> Tony
>
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