Unsetting an array

[duckduckgoose]

I'm having some array issues....

I'm trying to unset a session array, but it's not working as I thought it would.

My array looks this:

[cart] => Array (  [1427] => 1 [1658] => 23 )

$id = '1427';

I try:

unset($_SESSION['cart'][$id]) 

but my array winds up looking like this:

[cart] => Array (  [0] => 1 [1658] => 23 )

I thought by unsetting it it would then looks like this:

[cart] => Array ( [1658] => 23)

How can I unset an array element in the above example so that it prints as expected?

[NogDog]

I believe the problem is that $array[123] is not the same as $array['123']. The first uses an integer key, the second uses an associative (string) key. So set your $id = 1427;, or if it's coming from an external source, cast it to an integer:

$id = (int) $_POST['id'];

[duckduckgoose]

Hmm, I did have settype($id, "integer"), but I changed it to the example above, and it just got stranger...

Here's the code that unsets it:

if(isset($_POST['updateCart_x'])) {

  while(list($key,$value) = each($_POST)) {
    print_r($_POST);
    $id1 = str_replace("update_","",$key);
    $id = (int) $id1;
    $iQnt = (int) $value;

if($iQnt == 0) {
  unset($_SESSION['cart'][$id]);
} else {
  $_SESSION['cart'][$id] = $iQnt;
}
  }

  header("Location: ".$_SERVER['PHP_SELF']);
} /* ends update cart function */

So, if my array looks this:

[cart] => Array ( [1431] => 1 [50] => 1 ) ) 

And I press update, I wind up with this:

 [cart] => Array ( [1431] => 1 [0] => 17 )

[NogDog]

Any chance you could throw in a [FONT="Courier New"]printf("<pre>%s</pre>\n", print_r($POST, 1));[/FONT] prior to entering that section of code, then copying the output here (within

 tags) so we can see what the $_POST data looks like before you do anything with/to it?

[duckduckgoose]

Surely...

My cart array looks like this:

[cart] => Array ( [1427] => 1 [0] => 14 [1224] => 1 ) ) 

I change the quantity to 0 and press update:

Array
(
    [update_1224] => 0
    [update_1427] => 1
    [updateCart_x] => 89
    [updateCart_y] => 17
)
Array
(
    [update_1224] => 0
    [update_1427] => 1
    [updateCart_x] => 89
    [updateCart_y] => 17
)
Array
(
    [update_1224] => 0
    [update_1427] => 1
    [updateCart_x] => 89
    [updateCart_y] => 17
)
Array
(
    [update_1224] => 0
    [update_1427] => 1
    [updateCart_x] => 89
    [updateCart_y] => 17
)

Cart looks like this:

[cart] => Array ( [1427] => 1 [0] => 17 ) ) 

[duckduckgoose]

Hmm, it works fine if I change the input button to type="submit".... Why would the image type be wrecking things?

[duckduckgoose]

Well, I changed it to this:

if(isset($_POST['updateCart_x'])) {

  while(list($key,$value) = each($_POST)) {

printf("<pre>%s</pre>\n", print_r($_POST, 1));
if(eregi("update_", $key)) {
  $id1 = str_replace("update_","",$key);
  $id = (int) $id1;
  $iQnt = (int) $value;

  if($iQnt == 0) {
    unset($_SESSION['cart'][$id]);
  } else {
    $_SESSION['cart'][$id] = $iQnt;
  }

}
  }

  header("Location: ".$_SERVER['PHP_SELF']);
} /* ends update cart function */

And it works fine, but I still don't understand why it was getting messed up...

[NogDog]

The values from the image button were messing you up, because they evaluated to an index of 0. I got around it this way:

<?php
// set up test environment and data:
ini_set('display_errors', 1);
error_reporting(E_ALL);
session_start();
$_SESSION = array();
$_SESSION['cart'][1224] = 12;
$_SESSION['cart'][1427] = 14;
$_POST = array(
   'update_1224' => 0,
   'update_1427' => 1,
   'updateCart_x' => 89,
   'updateCart_y' => 17
);
// show initial session data:
printf("<pre>Before:\n%s</pre>\n", print_r($_SESSION, 1));

// do it:
if(isset($_POST['updateCart_x'])) {

  foreach($_POST as $key => $value) {
    $id = (int) str_replace("update_","",$key);
    if($id !== 0) {   // <<--------------------------- added this IF
       $iQnt = (int) $value;

   if($iQnt == 0) {
     unset($_SESSION['cart'][$id]);
   } else {
     $_SESSION['cart'][$id] = $iQnt;
   }
}
  }
}

// show end result:
printf("<pre>After:\n%s</pre>\n", print_r($_SESSION, 1));

?>