A question on object oriented programming
I have been learning PHP for three weeks now and I am trying to understand Object oriented programming. I am learning about classes the last couple of days and I have a question...
Below is the example code of a class given in php.net:
Code:
<?php
class Cart {
var $items; // Items in our shopping cart
// Add $num articles of $artnr to the cart
function add_item($artnr, $num) {
$this->items[$artnr] += $num;
}
// Take $num articles of $artnr out of the cart
function remove_item($artnr, $num) {
if ($this->items[$artnr] > $num) {
$this->items[$artnr] -= $num;
return true;
} elseif ($this->items[$artnr] == $num) {
unset($this->items[$artnr]);
return true;
} else {
return false;
}
}
}
?>
And, an object is created from the class and used like this:
Code:
<?php
$cart = new Cart;
$cart->add_item("10", 1);
$another_cart = new Cart;
$another_cart->add_item("0815", 3);
?>
Now, I see that all these codes do is, a function is created in the class and the function is called later...
But couldn't we accomplish this just by creating a function alone? Why do we need to define a class? What is the advantage of it?
