| Re: Parameter passing question [message #173542 is a reply to message #173540] |
Mon, 18 April 2011 18:20   |
Chuck Lavin
Messages: 5
Registered: April 2011
Karma:
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Junior Member |
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This is not a homework assignment. I'm working on a live remote server that
I'd rather not be playing around with.
According to the PHP doc page for isset(), isset() can't tell the difference
between a variable that's not set and a variable that's empty.
I need to move passed parameters into session variables:
1) If a parameter is passed with a value, set the session variable with that
value;
2) If a parameter is passed with an empty value, get rid of that session
variable;
3) If a parameter is not passed at all (not referenced in the URL), don't
touch the session variable.
And right now I can't tell the difference between a parameter being passed
empty and no parameter being passed at all.
Tnx
CL
"Denis McMahon" <denis(dot)m(dot)f(dot)mcmahon(at)gmail(dot)com> wrote in message
news:4dac7807$0$23634$bed64819(at)gradwell(dot)net...
> On Mon, 18 Apr 2011 13:03:24 -0400, Chuck Lavin wrote:
>
>> How do I tell these three passed parameters apart (PHP 5)?
>
>> http://www.somewhere.com?param=value // param has been set to 'value'
>> http://www.somewhere.com?param= // param has been set to empty (or
>> null)
>> http://www.somewhere.com // param has not been set at all
>
> This smells like it might be a homework question, or someone doing a
> w3schools online certification, but I'll bite.
>
> Have you tried something like the following:
>
> <?php
> if (isset($_GET['x'])) {
> if ($_GET['x'] == null) {
> // it's null
> } else {
> // it has data
> }
> } else {
> // it's not defined
> }
> ?>
>
> If you have tried it, did it do what you want, and if not how did it fail
> to do so[1]?
>
> If you haven't tried it, what have you tried so far?
>
> If you can't figure out what to use for x, please ask your teacher to
> revise passing parameters with you again.
>
> Rgds
>
> Denis McMahon
>
> [1] I don't think it quite does what you want, but I also think the
> change that needs to be made is trivial and you should be able to deduce
> it yourself.
>
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