Help with Array

[Canman2005]

Hi all

 

I have a small shopping cart system using an array to store product id numbers in.

 

It stores it like

 

2,34,55,55,67,121

 

Within my cart I have the following, which allows the quantity of a particular product ID to be increased

 

 if ($cart) {
$newcart = '';
foreach ($_POST as $key=>$value) {
if (stristr($key,'qty')) {
$id = str_replace('qty','',$key);
$items = ($newcart != '') ? explode(',',$newcart) : explode(',',$cart);
$newcart = '';
foreach ($items as $item) {
if ($id != $item) {
if ($newcart != '') {
$newcart .= ','.$item;
} else {
$newcart = $item;
}
}
}
for ($i=1;$i<=$value;$i++) {
if ($newcart != '') {
$newcart .= ','.$id;
} else {
$newcart = $id;
}
}
}
}
}
$cart = $newcart;

 

To use the above, I have a input field next to each item which looks like

 

<input type="text" name="qty23" value="" />

 

How can I adapt the above code so that if I pass in my URL

 

?action=update&id=23

 

then it would reduce the quantity of 23 by 1

 

so with an array which looked like

 

10,10,23,23,30

 

after passing

 

?action=update&id=23

 

it would then look like

 

10,10,23,30

 

any help would be great, been trying to crack this but with no luck

 

thanks in advance

 

ed

[nicholasstephan]

That's the weirdest way to store quantities dude...

 

take a look at the php array functions (http://us.php.net/manual/en/ref.array.php) you've got, you should be able to figure something out.

 

But I'd recommend that to turn your array into something more like:

 

$cart = array(

    '2' => '1', // id => quantity

    '34' => '1',

    '55' => '2',

    '67' => '1',

    '101' => '1'

);

 

Then all you'd have to do to increase a value in the array is:

 

$cart[$id]++;

 

Also - look into making your <input/> tags arrays too to save yourself all that string manipulation: Instead of having the input be named "qty23" you could name it "qty[23]"... then in php it's simply $_POST['qty']['23']...

 

Then you could update your quantities like: foreach($_POST['qty'] as $id => $qty) $cart[$id] = $qty;