Problems with checkboxes and sessions

[bigtommym]

Hi,

I'm creating a multipage form using sessions. You submit text info on the first page, session is started on the second page and i grab the information which is succesfully output on the second page. Second page has a huge amount of checkboxes on it.

You then move to the third page, session is started again and the first 10 fields of text are picked up as a session variable.

The problem is: When i try to pick up values for the checkboxes it works fine if they are checked, but unchecked i get the following error message:

Notice: Undefined index: c1 in C:\Program Files\Apache Group\Apache2\htdocs\mysite\myform3.php on line 15

this is the code for a couple of checkboxes on page 2:

<input name="c1" type="checkbox" id="c1" value="true">
<input name="c2" type="checkbox" id="c2" value="true">

this is the php used to pick up the checkbox value:

$c1 = $_POST['c1']; 
$_SESSION['c1'] = $c1;
$c2 = $_POST['c2']; 
$_SESSION['c2'] = $c2;

I think it may be a problem with the way i have defined the checkboxes (e.g. not in an array???).

Any help would be greatly appreciated, i've been working on this for ages and its starting to p*ss me right off!

Cheers

Tom

[LordShryku]

The way checkboxes work, if you don't check it, it won't show up on the next page. So you'll need to use [man]isset[/man] to check if they were checked or not.

[bigtommym]

OK, i understand that. the only problem is that being a complete muppet i haven't got a clue how or where to use the isset().

Do i use it on page2 (where the checkboxes reside) or page3 (where i'm picking up their values).

An example would be really great!!! 😃

Thanks for your help.

tom

[LordShryku]

// Change this
$c1 = $_POST['c1']; 
$_SESSION['c1'] = $c1; 
// To this
if(isset($_POST['c1'])) {
   $_SESSION['c1'] = $_POST['c1'];
}

[bigtommym]

thank you thank you thank you.

Thats cracked it.

Much appreciated as it means i can head to bed soon!😃