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==A Basic PHP 4 Class==



<source lang="html4strict">

<?php
class myPHP4Class {
var $my_variable;
function my_method($param) {
echo "my_method($param)!\n";
echo "my variable is: ";
echo "{$this->my_variable}\n";
}
}
$myinstance = new myPHP4Class();
$anotherinstance = new myPHP4Class();
?>

</source>

==A Basic PHP 5 Class==



<source lang="html4strict">

<?php
class myPHP5Class {
public $my_variable;
public function my_method($param) {
echo "called my_method($param)!\n";
echo "my variable is: ";
echo "{$this->my_variable}\n";
}
}
?>

</source>

==A class is a collection of variables and functions working with these variables.==



<source lang="html4strict">

<?php
class Cart {
var $items;

function add_item ($artnr, $num) {
$this->items[$artnr] += $num;
}
function remove_item ($artnr, $num) {
if ($this->items[$artnr] > $num) {
$this->items[$artnr] -= $num;
return true;
} else {
return false;
}
}
}
class Named_Cart extends Cart {
var $owner;
function set_owner ($name) {
$this->owner = $name;
}
}

$ncart = new Named_Cart;
$ncart->set_owner ("kris");
print $ncart->owner;
$ncart->add_item ("10", 1);
?>

</source>

==Aggregating an address object==



<source lang="html4strict">

<?
class Address {
protected $city;
public function setCity($city) {
$this->city = $city;
}

public function getCity() {
return $this->city;
}
}
class Person {
protected $name;
protected $address;
public function __construct() {
$this->address = new Address;
}
public function setName($name) {
$this->name = $name;
}
public function getName() {
return $this->name;
}
public function __call($method, $arguments) {
if (method_exists($this->address, $method)) {
return call_user_func_array(
array($this->address, $method), $arguments);
}
}
}
?>

</source>

==Basic Object Accessing==



<source lang="html4strict">

<?php
class myPHP4Class {
var $my_variable;
function my_method($param) {
echo "my_method($param)!\n";
echo "my variable is: ";
echo "{$this->my_variable}\n";
}
}
$myinstance = new myPHP4Class();
$anotherinstance = new myPHP4class();
$myinstance->my_variable = 10;
$anotherinstance->my_variable = 20;
$myinstance->my_method("MyParam");
?>

</source>

==Bird class==



<source lang="html4strict">

<?php
class Bird {
function __construct($name, $breed){
$this->name = $name;
$this->breed = $breed;
}
}
?>

</source>

==book class==



<source lang="html4strict">

<?php
class book
{
private $title;
private $isbn;
private $copies;
public function __construct($isbn)
{
$this->setIsbn($isbn);
$this->getTitle();
$this->getNumberCopies();
}
public function setIsbn($isbn)
{
$this->isbn = $isbn;
}
public function getTitle() {
$this->title = "Python";
print "Title: ".$this->title."<br />";
}
public function getNumberCopies() {
$this->copies = "5";
print "Number copies available: ".$this->copies."<br />";
}
}
$book = new book("11111111X");
?>

</source>

==Class Type Hints==



<source lang="html4strict">

<?
class Dog {
public function do_drool( ) {
echo "Sluuuuurp\n";
}
}
class Cat { }
function drool(Dog $some_dog) {
$some_dog->do_drool( );
}
$poppy = new Dog( );
drool($poppy);

$poppy = new Cat( );
drool($poppy);
?>

</source>

==Empty class==



<source lang="html4strict">

<?php
class StringThing {}
$st = new StringThing();
print $st;
?>

</source>

==Implementing a Simple Class==



<source lang="html4strict">

<?php
class SimpleClass {
public $data;
public function echoMyData() {
echo $this->data;
}
}
$sc_object = new SimpleClass();
$sc_object->data = "Hello, world! ";
$another_object = new SimpleClass();
$another_object->data = "Goodbye, world! ";
$sc_object->echoMyData();
$another_object->echoMyData();
?>

</source>

==Person class==



<source lang="html4strict">

class Person {
public $name;
protected $spouse;
private $password;

public function __construct($name) {
$this->name = $name
}
public function getName() {
return $name;
}
protected function setSpouse(Person $spouse) {
if (!isset($this->spouse)) {
$this->spouse = $spouse;
}
}
private function setPassword($password) {
$this->password = $password;
}
}

</source>

==PHP class declaration structure==



<source lang="html4strict">

<?
class Class_name {
var $attribute_1;
var $attribute_N;
function function1() {
}
function functionN() {
}
}
?>

</source>

==Pre-defined methods==



<source lang="html4strict">

__construct() is called when a new instance of the class is created.
__destroy() is called when an instance of the class passes out of memory (calling unset()).
__autoload() is called when you refer to a class for the first time.
__clone() is called when you copy the object using the clone keyword.
__get() and __set() are called when you get or set an object property that is not defined.
__get() takes a single parameter, the name of the property;
__set() takes two parameters: the name of the property and the value.
__call() is called when you try to call an undefined method.
__call() takes two arguments: the method name that was used and an array containing any values that were passed to the method.
__sleep() and __wakeup: __sleep() is called when you try to serialize() an object.
__wakeup() is called when you unserialize() an object.
__toString() is called when a string representation of the object is required.

</source>

==Using an aggregated class==



<source lang="html4strict">

<?
class Address {
protected $city;
protected $country;

public function setCity($city) { $this->city = $city; }
public function getCity() { return $this->city; }
public function setCountry($country) { $this->country = $country; }
public function getCountry() { return $this-> country;}
}
class Person {
protected $name;
protected $address;
public function __construct() { $this->address = new Address; }
public function setName($name) { $this->name = $name; }
public function getName() { return $this->name; }
public function __call($method, $arguments) {
if (method_exists($this->address, $method)) {
return call_user_func_array( array($this->address, $method), $arguments);
}
}
}
?>

</source>

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в 10:37, 26 мая 2010

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