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09.22.04
A Shopping Cart Class In PHP
 By Amrit Hallan
Classes have eluded me (rather I have eluded them) since the beginning of my primitive programming days (remember Turbo C++?).
They have always hovered over the horizons. This hasn't nagged me much, for I've been managing without classes pretty well, but sooner or later I had to come in contact with them. So in the morning (and I hadn't slept the entire night) I executed a gut-wrenching plunge into the depths of classes, and the shopping cart class was the first thing I wrote. Although I have made content management systems and algorithmic quote generations in PHP, I had not added a shopping cart class code to my code repository. It was not as tough as I had envisaged. I could have done something simpler but scripts like "Hello world!" seem silly after a point.
A class, as what I make of it is, a container of sorts that not only contains the variables required to perform a task, but even the sub-tasks to achieve the main objective. So what do we need in a cart class? We need an array that can store item ids and their quantities, and we need some functions that help us add items, delete them, and change their quantities. It is always better to write down a list of things to be done and a list of things needed to accomplish that.
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We begin our class like this:
<?php
class ShoppingCart {
var $items;
}
?>
$items is going to be an associative array to hold the precious information. Now that we have declared the container array, we need a function to add items to it.
<?php
class ShoppingCart {
var $items;
function add_items($product_id, $qty)
{
$this->items[$product_id]=$qty;
}
}
?>
This is as simple as it looks. It accepts a product id (here in this case we can store anything, even the name of the product), makes it a key element of the associative array $items and gives it a value $qty.
How do we use this class? Interestingly, whenever we declare a variable when programming, we declare it as a "type", for instance, an integer type, or a char type, or a string type. You can perform certain operations using these types. These types are nothing but pre-defined classes carrying their intrinsic characteristics. In this case (our shopping cart class), we'll define a variables as "ShoppingCart" in the following manner:
Read the Full Article
About the Author:
Amrit Hallan is a web designer and developer. He has experience in developing
PHP-MySQL applications as well as simple HTML websites. Visit his website --
http://www.bytesworth.com to read more articles and see the kind of work
he does. |
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