Unsetting session variables when a checkbox is set to unchecked

[Pete]

I have some session variables which get set on page one of my site. I
can set an unset these by passing through a parameter in some URL's.
When the user goes to the second page some checkboxes are checked if
their corresponding session variable is set and has a value of "true".

The problem I have is that if the user unchecks a checkbox before
finally moving to page three (which is perfectly okay for them to do if
they wish) then I need to unset the session variable. It's not a
problem if it goes from unchecked to checked as I can check for the
value of the checkbox in page 3 and if it's set then I can set the
corresponding session variable however as an unchecked checkbox is not
sent through as part of the $_POST array then I obviously can't do a
check for it. What I really need to do is alter the session variable as
soon as they update the checkbox.

Can anyone help? I can kind of think of a solution but it involves
JavaScript (again) but that's a story for a different newsgroup...

Thanks,

Pete.

[Pedro Graca]

Pete wrote:

The problem I have is that if the user unchecks a checkbox before
finally moving to page three (which is perfectly okay for them to do if
they wish) then I need to unset the session variable. It's not a
problem if it goes from unchecked to checked as I can check for the
value of the checkbox in page 3 and if it's set then I can set the
corresponding session variable however as an unchecked checkbox is not
sent through as part of the $_POST array then I obviously can't do a
check for it. What I really need to do is alter the session variable as
soon as they update the checkbox.

Instead of checking checkboxes within the $_POST array do that within
the $_SESSION array

<?php
foreach ($_SESSION['checkbox'] as $k=>$dummy) {
if (isset($_POST[$k])) $_SESSION['checkbox'][$k] = true;
else $_SESSION['checkbox'][$k] = false;
}
?>

Just remember to name your HTML checkboxes the same as your
$_SESSION['checkbox'] indexes


<?php // form output
$_SESSION['checkbox']['cb1'] = true;
echo '<input type="checkbox" name="cb1" checked>';
// ...
?>
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