Examples
In this example, we first define a base class and an extension
of the class. The base class describes a general vegetable,
whether it is edible or not and what is its color. The subclass
Spinach adds a method to cook it and another to find out if
it is cooked.
Example 1. classes.inc
<?php
// base class with member properties and methods
class Vegetable {
var $edible;
var $color;
function Vegetable($edible, $color="green")
{
$this->edible = $edible;
$this->color = $color;
}
function is_edible()
{
return $this->edible;
}
function what_color()
{
return $this->color;
}
} // end of class Vegetable
// extends the base class
class Spinach extends Vegetable {
var $cooked = false;
function Spinach()
{
$this->Vegetable(true, "green");
}
function cook_it()
{
$this->cooked = true;
}
function is_cooked()
{
return $this->cooked;
}
} // end of class Spinach
?>
We then instantiate 2 objects from these classes and print
out information about them, including their class parentage.
We also define some utility functions, mainly to have a
nice printout of the variables.
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