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Posted by Richard Lynch on 04/19/05 08:18
On Mon, April 18, 2005 9:42 pm, Chris Kay said:
>
> unset($_POST['buttonNew']);
> wont work?
Sure it "works"
It's just not useful in the context of this thread :-)
How do you know to unset it the second time when they hit "refresh" (aka
"reload") though?
I should have said "won't solved that specific problem"
You can change $_POST all you want, but it doesn't change that fact that
that's what the browser *sent* to you.
To reliable detect a "reload" of a page, you need to somehow change
something in between "load" and "reload" and you have to tie it to that
user, filling in that form, at that time.
There's no easy way to do that unless *YOU* somehow notate each FORM you
send out, and then mark it as "used" when it comes back.
> On Mon, Apr 18, 2005 at 08:25:04PM -0700, Richard Lynch wrote:
>> On Fri, April 15, 2005 5:08 am, Mario de Frutos Dieguez said:
>> > I have another little question hehe :D, i have a page with a form
>> where
>> > the user insert data and can click in a new,edit or delete button.
>> I've
>> > make that when a button is clicked the page refresh and in the head of
>> > the page i have conditions like this: if ($_POSt["buttonNew"]!="") {
>> > insert commands.. } , etc
>> >
>> > My question is, how can i unset $_POST["buttonNew"] or leave it empty
>> > because when the user refresh the page make insert commans again
>> because
>> > the $_POST["buttonNew"] arent empty.
>>
>> The POST data is sent by the browser, so you can't really alter that...
>>
>> But you can bury an http://php.net/md5 or other random token in the
>> FORM,
>> and put that token in a table in your database, and then on the first
>> POST, you mark that token as "used"
>>
>> On the second POST, a re-load, you can detect that the token was "used"
>> and do whatever you want. Re-direct the user, ignore them completely,
>> give them an error message, blow up their computer. Well, okay, you can
>> do almost whatever you want.
>>
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