항상 기뻐하라(Be joyful always;)

[code php;gutter:false] <?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

?> [/code]

[code php;gutter:false] <?php

include "classes.php";

// utility functions

function print_vars($obj) {
$arr = get_object_vars($obj);
while (list($prop, $val) = each($arr))
echo "\t$prop = $val\n";
}

function print_methods($obj) {
$arr = get_class_methods(get_class($obj));
foreach ($arr as $method)
echo "\tfunction $method()\n";
}

function class_parentage($obj, $class) {
global $$obj;
if (is_subclass_of($$obj, $class)) {
echo "Object $obj belongs to class ".get_class($$obj);
echo " a subclass of $class\n";
} else {
echo "Object $obj does not belong to a subclass of $class\n";
}
}

// instantiate 2 objects

$veggie = new Vegetable(true,"blue");
$leafy = new Spinach();

// print out information about objects
echo "veggie: CLASS ".get_class($veggie)."\n";
echo "leafy: CLASS ".get_class($leafy);
echo ", PARENT ".get_parent_class($leafy)."\n";

// show veggie properties
echo "\nveggie: Properties\n";
print_vars($veggie);

// and leafy methods
echo "\nleafy: Methods\n";
print_methods($leafy);

echo "\nParentage:\n";
class_parentage("leafy", "Spinach");
class_parentage("leafy", "Vegetable");

?> [/code]