Dan:
Thanks very much for the detailed reply. I took most of this code from Welling and
Thomson's book
"PHP and MySQL Development," (chpt. 25) but I'm trying to modify it to fit my
purposes. The html is
mostly theirs, and it's not the way I would write it, but it's working on my test
machine. I plan to
clean it up and do cross-browser testing once the scripts work.
I agree completely that the problem is most likely in the foreach line of the
following code.
if($save)
{
foreach($cart as $artID => $value)
{
if(empty($value))
unset($cart[$artID]);
else
$cart[$artID] = $$artID;
}
You asked about the structure of the cart, and here's another problem area. One of the
greatest
difficulties I've had learning PHP (my first attempt at any scripting/programming
language, in case
you hadn't noticed), is understanding array structures.
The cart is created by the show_cart page when items are added to it. Here's the
relevant code
(which immediately precedes the "if($save)" snippet sent in the previous message:
<?php
include ('article_sc_fns.php');
session_start();
if($new)
{
//new item selected
if(!session_is_registered("cart"))
{
$cart = array();
session_register("cart");
$article_qty = 0;
session_register("article_qty");
$total_words = 0;
session_register("total_words");
}
if($cart[$new])
$cart[$new]++;
else
$cart[$new] = 1;
When the article is added to the shopping cart the variable is passed to the
"show_cart" page
through the URL ("show_cart.php?new=$artID") The original code was written to allow
for changing
quantities of items in the cart, which is irrelevant for me, but I've left the code as
is because it
doesn't seem to interfere with any other code and is necessary for adding items to the
cart.
I'm checking the cart structure by printing the following code inserted right after
the "if($save);"
line (is this the best way to check on the contents of an array?)
while (list($key,$value) = each($cart))
{
print "Cart = $key: $value<BR>";
}
This returns "article ID number (an integer) : 1" when new
and "article ID : yes" after the save button has been clicked.
I tried naming the checkbox "want[$artID]" but as far as I can tell the $want array
and the $cart
array are two separate entities and none of the code I've tried seems to work on both,
even when
they have the same key ($artID). For example, when I revised the code you sent earlier
to
while (list($artID,) = each ($_POST['want']))
$cart[$artID];
it didn't work. Obviously, something else could be interfering.
Re: the line of code you thought odd and asked about:
else
$cart[$artID] = $$artID;
I thought it was odd too, and since this is acquired code, I can't explain it. I
assumed that it
just resets the artID to its original value.
I'm afraid this message is way too long, and I apologize if it's too much. I hesitated
posting
questions in the first place because the interaction of the code seemed fairly
complex, but I'm also
quite desperate.
Once again, many thanks for your patience and attention.
Vicki
--
PHP General Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php
