в 10:37, 26 мая 2010

2010-05-26T10:37:27Z

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2010-05-26T07:00:43Z

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==Class inheritance in action==



<source lang="html4strict">

<?php
class AbstractClass {
function abstractFunction() {
die( "AbstractClass::abstractFunction() is abstract\n" );
}
}
class ConcreteClass extends AbstractClass {}
$test = new ConcreteClass();
$test->abstractFunction();

</source>

==Create two child classes==



<source lang="html4strict">
<?php
class vehicle{
var $brand_name;
var $number_of_wheels;
var $seating_capacity;
}
class car extends vehicle {
var $doors;
var $prooftype;
var $powersteering;
var $powerwindows;
}
class motorbike extends vehicle {
var $engine;
}
$merk= new car;
$dukat=new motorbike;
?>

</source>

==Improved Inheritance: call parent constructor==



<source lang="html4strict">

<?php
class shape
{
var $x;
var $y;

function shape($x, $y) {
$this->move_to($x, $y);
print("Shape constructor called ");
}
function get_x() {
return $this->x;
}
function get_y() {
return $this->y;
}
function set_x($x) {
$this->x = $x;
}
function set_y($y) {
$this->y = $y;
}
function move_to($x, $y) {
$this->x = $x;
$this->y = $y;
}
function print_data() {
print("Shape is currently at " . $this->get_x() . ":" .
$this->get_y() . " ");
}
function draw()
{}
}
class rectangle extends shape
{
function rectangle($x, $y) {
parent::shape($x, $y);
}
function draw() {
print("Drawing rectangle at " . $this->x . ":" .
$this->y . " ");
}
function print_data() {
print("Rectangle currently at " . $this->get_x() . ":" .
$this->get_y() . " ");
}
}
$rect1 = new rectangle(100, 100);
$rect1->draw();
$rect1->print_data();
?>

</source>

==Inheriting a Shape Class==



<source lang="html4strict">
<?php
class shape {
var $x;
var $y;

function shape() {
print("Shape constructor called ");
}
function get_x() {
return $this->x;
}
function get_y() {
return $this->y;
}
function set_x($x) {
$this->x = $x;
}
function set_y($y) {
$this->y = $y;
}
function move_to($x, $y) {
$this->x = $x;
$this->y = $y;
}
function print_data() {
print("Shape is currently at " . $this->get_x() . ":" .
$this->get_y() . " ");
}
function draw()
{}
}
class rectangle extends shape
{
function rectangle($x, $y) {
$this->move_to($x, $y);
}
function draw() {
print("Drawing rectangle at " . $this->x . ":" .
$this->y . " ");
}
function print_data() {
print("Rectangle currently at " . $this->get_x() . ":" .
$this->get_y() . " ");
}
}

$rect1 = new rectangle(100, 100);
$rect1->draw();
$rect1->print_data();
?>

</source>

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PHP/Class/Class Inheritance - История изменений

в 10:37, 26 мая 2010

Admin: 1 версия