Thanks to Jason and �Sp� for the tip on �print_r�. After all the books I�ve read, and
all the
scrounging through the manual, I�m amazed I missed that one. It�s VERY helpful!
Thanks for your comments Dan. I�ve actually spent quite some time trying to rework the
cart because
I agree that the way it�s written now is strange. However, I hit a wall trying to
rework it, and
decided to go back to the same wall I�ve been banging my head against all week.
I think you understand most of the process with one clarification. When the user
unchecks a checkbox
to remove an article from the cart, they click a �save� button (which triggers the
if($save) part of
the script). The �checkout� button triggers a separate process that�s not really
involved here. The
show_cart page is only showing the articles added to the cart and refreshing the cart
when articles
are removed � and of course setting the session variables for the cart.
I�ve included the information you requested at the bottom of this message, showing the
contents of
the $cart and $checkbox arrays at various stages. The relevant code from the show_cart
page is this:
if($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";
}
if($save) //save button clicked
{
foreach($cart as $artID => $value)
{
if(!isset($yes))
unset($cart[$artID]);
else
$cart[$artID] = $$artID;
}
}
I know the �foreach� part under if($save) is all wrong. It seems to me that it should
be possible to
write some sort of loop that says �if the artID (key) for an element in the cart array
doesn�t match
an artID in the checkbox array, then unset the element with that artID from the cart
array.� OR
�only display those elements in the cart array for which an element exists in the
checkbox array
that has the same key.�
I�ve tried a bunch of different ways to do this with no success. I�m not even sure you
can work with
two arrays in this way in PHP. Couldn�t you do something like
if ($checkbox[$artID] == $cart[$artID]))
{ then those are the elements that make up the array $cart }
I haven�t been able to figure this part out. Aargh! Perhaps something is patently
obvious in this
code to PHPers. If so, I truly welcome your suggestions, and Dan I really appreciate
your looking at
this so closely.
Exasperated, Vicki
PS when I use print_r to display the contents of the arrays, I see a "1" after the
array contents. I
have no idea what that refers to. Any ideas?
___________________________________________________
Here's the code you requested. This is from the View Source window so hopefully you
can see what's
going on more clearly. The first sample is when two new articles have been added to
the cart. I've
included the array info and the relevant html.
<pre> Cart Array at top of show_cart page: Array
(
[3] => 1
[1] => 1
)
1</pre>
<pre> Checkbox Array at top of show_cart page: 1</pre>
<pre> Cart Array after "if($save)": Array
(
[3] => 1
[1] => 2
)
1</pre>
<pre> Checkbox Array after "if($save)": 1</pre>
//
//
//HTML header info deleted here . . .
//
//
<p align="center"><strong>Welcome, User!</strong></p>
<center><a href="show_cat.php?catID=3"><img src="images/continue-shopping.gif"
alt="Continue Shopping" border=0 height = 25 width = 160></a></center>
<center><a href="http://127.0.0.1/ifiosx/checkout.php";>
<img src="images/go-to-checkout.gif" alt="Go To Checkout"
border=0 height = 25 width = 160></a></center></td>
<td class="maincontent" valign="top">
<img src="images/misc/shim.gif" width="160" height="1">
<p><span class="mediumheading"></span></p>
<table border = 0 width = 100% cellspacing = 0>
<form action = show_cart.php method = post>
<tr>
<th bgcolor="#cccccc"> </th>
<th align=left bgcolor="#cccccc">Article</th>
<th bgcolor="#cccccc">Word Count</th></tr>
<tr><td width=5% align = left>
<input type = checkbox name = "checkbox[3]" value = yes checked></td>
<td align = left><a href = "show_article.php?artID=3">Q & A</a></td>
<td align = center>235</td>
<tr><td width=5% align = left bgcolor="#f4f4ea">
<input type = checkbox name = "checkbox[1]" value = yes checked></td>
<td align = left><a href = "show_article.php?artID=1">The Photos We
Keep</a></td>
<td align = center>300</td>
<tr>
<th bgcolor="#cccccc"> </th>
<th align=left bgcolor="#cccccc">Number of Articles = 2</th>
<th align = center bgcolor="#cccccc">535</th>
</tr>
<tr>
<td colspan=3 align = center>
<br>To remove an article from your order, <br>
uncheck the box to the left of the title
and click on the "Save Changes" button.
<br><br>
<input type = hidden name = save value = true>
<input type = image src = "images/save-changes.gif" border = 0
alt = "Save Changes"></td></tr></form></table>
</table>
</body>
</html>
___________________________________
The arrays after "save" button has been clicked (but checkboxes left checked). The
keys are the
correct artID for the articles chosen.
<pre> Cart Array at top of show_cart page: Array
(
[1] => 1
[3] => 1
)
1</pre>
<pre> Checkbox Array at top of show_cart page: Array
(
[1] => yes
[3] => yes
)
1</pre>
<pre> Cart Array after "if($save)": Array
(
[1] =>
[3] =>
)
1</pre>
<pre> Checkbox Array after "if($save)": Array
(
[1] => yes
[3] => yes
)
1</pre>
______________________________________
The arrays after the checkbox for the article with artID==3 has been unchecked. This
results in the
cart being emptied entirely and the result "There are no items in your cart."
<pre> Cart Array at top of show_cart page: Array
(
[1] =>
[3] =>
)
1</pre>
<pre> Checkbox Array at top of show_cart page: Array
(
[1] => yes
)
1</pre>
<pre> Cart Array after "if($save)": Array
(
)
1</pre>
<pre> Checkbox Array after "if($save)": Array
(
[1] => yes
)
1</pre>
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