updating checkbox session values

M_RT

Hi all

I have a series of forms, some of which have checkboxes in them. I am using sessions to carry variable values through the form process.

My problem is when someone goes back to a previous form to update a checkbox value, the new value is being posted and added to the session but the old session value (now an unchecked checkbox) is not being updated and the old session value still exists.

eg.

1) First time submitted

checkbox 1 = checked
checkbox 2 = not checked

when submitted

$_SESSION[checkbox1] = checkbox1

2) When returning to update form

checkbox 1 = not checked
checkbox 2 = checked

when submitted

$SESSION[checkbox1] = checkbox1
$SESSION[checkbox2] = checkbox2

As you can see above, the $_SESSION[checkbox1] variable still exists.

Can anyone suggest how I can either remove the $_SESSION[checkbox1] variable or update it with a 'null' value....????

Note: Session variables are being created using:

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

bogu

Did u tried unset()?

M_RT

Thanks bogu for the quick responce.

The unset() function is exactly what I need to use when I have identified which $_SESSION variable I need to change.

My problem now is how do I isolate which $_SESSION variable to unset?

I do not have a $_POST value being sent from the previous form for an unchecked checkbox?

bogu

M@RT wrote:
I do not have a $_POST value being sent from the previous form for an unchecked checkbox?

🙂
No, u dont have ...

But u have values for thoes that are checked, so u can rewrite your session ...

M_RT

But u have values for thoes that are checked, so u can rewrite your session ...

And there is the problem....... 😕

Unfortunately, if i rewrite the session I will loose all of the session variables for the next form down the line.

The ideal for this chain of forms is that a user can go back to any part of the chain and make a single change without having to re-type anything further down the line.

bogu

K, I dont know how do u think your algorithm for this but it took me 5 min to make u an example ...

pag1.php

<?php
	session_start();
	if (isset($_POST['hdnAction'])) {
		if ($_POST['hdnAction']=="pag2") {
			$_SESSION[$_POST['hdnAction']] = $_POST;
		}
	}
	$txtType1 = "";$txtType2 = "";
	if (!empty($_SESSION['pag1'])) {
		$txtType1 = $_SESSION['pag1']['txtType1'];
		$txtType2 = $_SESSION['pag1']['txtType2'];
	}
?>
<form method="POST" action="pag2.php">
	<input type="text" name="txtType1" value="<?=$txtType1;?>" />
	<br />
	<input type="text" name="txtType2" value="<?=$txtType2;?>" />
	<br />
	<input type="submit" name="btnSubmit" value="Next &raquo;" />
	<input type="hidden" name="hdnAction" value="pag1" />
</form>

pag2.php

<?php
	session_start();
	if (isset($_POST['hdnAction'])) {
		$_SESSION[$_POST['hdnAction']] = $_POST;
	}
	$txtType1 = "";$txtType2 = "";
	if (!empty($_SESSION['pag2'])) {
		$txtType1 = $_SESSION['pag2']['txtType1'];
		$txtType2 = $_SESSION['pag2']['txtType2'];
	}
?>
<form method="POST" action="pag3.php">
	<input type="text" name="txtType1" value="<?=$txtType1;?>" />
	<br />
	<input type="text" name="txtType2" value="<?=$txtType1;?>" />
	<br />
	<input type="button" name="btnBack" value="&laquo; Back" onclick="document.forms[0].action='pag1.php';document.forms[0].submit();" />
	<input type="submit" name="btnSubmit" value="Next &raquo;" />
	<input type="hidden" name="hdnAction" value="pag2" />
</form>

pag3.php

<?php
	session_start();
	if (isset($_POST['hdnAction'])) {
		$_SESSION[$_POST['hdnAction']] = $_POST;
	}
	$txtType1 = "";$txtType2 = "";
	if (!empty($_SESSION['pag3'])) {
		$txtType1 = $_SESSION['pag3']['txtType1'];
		$txtType2 = $_SESSION['pag3']['txtType2'];
	}
?>
<form method="POST" action="result.php">
	<input type="text" name="txtType1" value="<?=$txtType1;?>" />
	<br />
	<input type="text" name="txtType2" value="<?=$txtType1;?>" />
	<br />
	<input type="button" name="btnBack" value="&laquo; Back" onclick="document.forms[0].action='pag2.php';document.forms[0].submit();" />
	<input type="submit" name="btnSubmit" value="Next &raquo;" />
	<input type="hidden" name="hdnAction" value="pag3" />
</form>

result.php

<?php
	session_start();
	if (isset($_POST['hdnAction'])) {
		$_SESSION[$_POST['hdnAction']] = $_POST;
		$redirect = "result.php";
		header("Location: {$redirect}");
		die("If the page doesn't redirect click <a href='{$redirect}'>here</a>");
	}
	echo "<pre>",print_r($_SESSION,1),"</pre>";
?>

Have fun coding... 😃

M_RT

Wow.... 🙂

Thanks for the code bogu

Took a while to addapt but is working now 😃