Why doesn't this array update if no checkbox is selected?

[Exoon]

Hi,

 

Ive got this form:

 

 

Im using this to store my selections of a form in sessions so they can be recalled if the user goes back to another page of the form.

The problem i have is it always has to have 1 selection, If i tick Jam, then untick Jam and tick butter that works fine, But if i uncheck everything then it doesn't clear the array. It always has to have at least 1 entry in the array for some reason?

foreach($_POST as $key => $value) {
$_SESSION[$key] = $value;
}

This is the checkbox code im using:

<inputtype="checkbox name="<?php echo $course_menuname."extras[]"; ?>" <?php if(in_array("$extraitems", $_SESSION[$course_menuname.'extras'])) { echo "checked"; } ?> value="<?php echo $extraitems; ?>" id="checkbox">

These are the variables:

$extraitems contains the "Toast Extras" words, such as Jam, Butter and Flora $course_menuname contains the course such as "breakfast_cereal", "breakfast_toast" then if it has the word extra it does checkbox underneath.

[Rifts]

try to force clear the array if everything is unchecked?

if(all unchcked)
unset($array);

or you could try using some jquery and prevent the user from unchecking them all

[Exoon]

i need to let them be able to uncheck them really, I can't figure out how to check if its empty then unset it

 

in my foreach loop, the $key has "brreakfast_toastextras" and $value has "Jam" inside it. I tried this:

 

      foreach($_POST as $key => $value) {
        if( !isset($_POST[$key]) ) {
          unset($_SESSION[$key]);
        } else {
          $_SESSION[$key] = $value;
        }
      }

It doesn't work though, any ideas?

[JonnoTheDev]

When the form is submitted, firstly destroy the session variable and then reset it. Sessions will persist until you destroy them. It would be better to store the post data under a specific session key as opposed to a direct copy of the post array so you can easily clear it.

i.e

// form submitted
if(isset($_POST) && count($_POST))
{
 // clear session data
 unset($_SESSION['form_data']);
 // store session data
 $_SESSION['form_data'] = $_POST;
}

// just to see whats in my session I will dump it
if(isset($_SESSION)) 
{
 print_r($_SESSION);
}

[Exoon]

I add your if statement to for loop and if i select nothing it still doesn't clear the session

      foreach($_POST as $key => $value) {
        // form submitted
        if(isset($_POST[$key]) && count($_POST[$key]))
        {
         // clear session data
         unset($_SESSION[$key]);
         // store session data
         $_SESSION[$key] = $value;
        }
      }

Edit:

 

I found this while looking on google and it seems to have worked i think, Incase anyone else having the same issue:

<form>
<input type='hidden' value='0' name='selfdestruct'>
<input type='checkbox' value='1' name='selfdestruct'>
</form>

[Ch0cu3r]

The problem is checkbox fields are only contained within the $_POST if they are checked. If they are not checked then they wont be in the $_POST array.

 

If you used neil.johnson suggestion correctly you wont need to add a hidden form field.