Inheritance
To create a class that inherits functionality from a parent class, we need to alter our class declaration slightly. Listing 9.6 simplifies the Item class and creates an inheriting class called PriceItem.
Listing 9.6. Creating a Class That Inherits from Another
1:<?php
2:class Item {
3: var $name;
4:
5: function Item( $name="item", $code=0) {
6: $this->name = $name;
7: $this->code = $code;
8: }
9:
10: function getName() {
11: return $this->name;
12: }
13: }
14:
15: class PriceItem extends Item {
16:
17: }
18:
19: $item = new PriceItem( "widget", 5442 );
20: print $item->getName ();
21: // outputs "widget"
22:
23: ?>
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In addition to the simple Item class defined on line 2, we have created an even more basic PriceItem class on line ...
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