_POST help

[Anon]

Hi,

I'm trying to write a function to validate forms with checkboxes (first time I've tried to write a function).
Everything seems ok with my code but I'm getting an error I don't understand or can find resources on.

If I press submit with no checkbox checked I get the following error: Warning: Invalid argument supplied for foreach()

Can anyone point out the issue? I'm not brilliantly confident with the posted variables but the foreach statement works in others contexts.

Thanks in advance. I hope the posting of the code doesn't seem presumptuous..

// If the RequestMethod is POST, then the form has been submitted
if ($_SERVER['REQUEST_METHOD']=='POST')
{

//for every element of the choice array bring back the array index and element value
foreach ($choice As $array_index => $flag)
{
// if the elements value is equal to 'on' i.e. the checkbox is checked
if ($flag=='on')
{
$checked_count++;

    // Validate form, make sure the Customer Number is set and not empty 
    if ((isset($_POST[member_no][1])) && (!empty($_POST[member_no][1]))) 
    { 
      //run insert into d/b program
      header("Location: insert2.php"); 
      exit(); 
    } 
    else 
    { 
      // If input field is blank print a message
      echo "<b>You must not leave member blank</b>"; 
    } 
  } // end if flag==on

} // end foreach 

if ($checked_count < 1)
{
echo "<b>You have to check at least one box</b>";

}

} // end if REQUEST_METHOD==POST

[van__]

foreach ($choice As $array_index => $flag)

Then $choice is not an array.
Back track and see where you try to set it,
and see why it's not happening.

[Anon]

That's what I thought but it is an array in the form.

That's why I was thinking it was down to context i.e. because I'm now referring to $choice in a different part of the program.

Chris

[van__]

Slap this in before the foreach:
print_r($choice);

That will spit out the entire array if it's set and show you how it's mapped.

If it is indeed set, is it a 2D array?
the way you are invoking foreach requires a 2D array to satisfy the condition of $key=>$val

If it's not a 2D array just use
foreach($choice as $key)

[Anon]

hmmm, I'm getting super-confused now because it is a 1D array but I use this same code all the time for validating forms so now I'm thinking my other code is only working by a fluke.

The print_r reveals no array though.

Two things about this are odd to me:

1. Aside from the error the code works i.e. if I check array element 1 it calls the next program and the code works so I don't see how $choice can't be an array.

2. I've used this exact same code to validate other forms but not where I've been accessing the posted variables i.e. the foreach code would stand alone in the code and insert records for the checked rows.

I think I need to read a little....

Thanks though.