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-Example 1: A singleton (static members)
-=======================================
-
-<?php
-
- class Counter {
- var $counter = 0;
-
- function increment_and_print()
- {
- print ++$this->counter;
- print "\n";
- }
- }
-
-
- class SingletonCounter {
- static $m_instance = NULL;
-
- function Instance()
- {
- if (self::$m_instance == NULL) {
- self::$m_instance = new Counter();
- }
- return self::$m_instance;
- }
- }
-
- SingletonCounter::Instance()->increment_and_print();
- SingletonCounter::Instance()->increment_and_print();
- SingletonCounter::Instance()->increment_and_print();
-
-?>
-
-Example 2: Factory method (derefencing objects returned from functions)
-=======================================================================
-
-<?php
-
- class Circle {
- function draw()
- {
- print "Circle\n";
- }
- }
-
- class Square {
- function draw()
- {
- print "Square\n";
- }
- }
-
- function ShapeFactoryMethod($shape)
- {
- switch ($shape) {
- case "Circle":
- return new Circle();
- case "Square":
- return new Square();
- }
- }
-
- ShapeFactoryMethod("Circle")->draw();
- ShapeFactoryMethod("Square")->draw();
-
-
-?>
-
-Example 3: Class constants and class scope
-==========================================
-
-<?php
-
- class ErrorCodes {
- const FATAL = "Fatal error\n";
- const WARNING = "Warning\n";
- const INFO = "Informational message\n";
-
- function print_fatal_error_codes()
- {
- print "FATAL = " . FATAL;
- print "self::FATAL = " . self::FATAL;
- }
- }
-
- /* Call the static function and move into the ErrorCodes scope */
- ErrorCodes::print_fatal_error_codes();
-
-?>
-
-Example 4: Regular object method using both local and global functions
-======================================================================
-
-<?php
-
- class HelloWorld {
- const HELLO_WORLD = "Hello, World!\n";
-
- function get_hello_world()
- {
- return HELLO_WORLD;
- }
-
- function length_of_hello_world()
- {
- $str = $this->get_hello_world();
- return strlen($str);
- }
- }
-
- $obj = new HelloWorld();
- print "length_of_hello_world() = " . $obj->length_of_hello_world();
- print "\n";
-?>
-
-Example 5: Multiple derefencing of objects returned from methods
-================================================================
-
-<?php
-
-
- class Name {
- function Name($_name)
- {
- $this->name = $_name;
- }
-
- function display()
- {
- print $this->name;
- print "\n";
- }
- }
-
- class Person {
- function Person($_name, $_address)
- {
- $this->name = new Name($_name);
- }
-
- function getName()
- {
- return $this->name;
- }
- }
-
- $person = new Person("John", "New York");
- $person->getName()->display();
-
-?>
-
-Example 6: Exception handling
-=============================
-
-<?
- class MyException {
- function MyException($_error) {
- $this->error = $_error;
- }
-
- function getException()
- {
- return $this->error;
- }
- }
-
- function ThrowException()
- {
- throw new MyException("'This is an exception!'");
- }
-
-
- try {
- } catch (MyException $exception) {
- print "There was an exception: " . $exception->getException();
- print "\n";
- }
-
- try {
- ThrowException();
- } catch (MyException $exception) {
- print "There was an exception: " . $exception->getException();
- print "\n";
- }
-
-?>
-
-Example 7: __clone()
-===================
-
-<?
- class MyCloneable {
- static $id = 0;
-
- function MyCloneable()
- {
- $this->id = self::$id++;
- }
-
- function __clone()
- {
- $this->name = $that->name;
- $this->address = "New York";
- $this->id = self::$id++;
- }
- }
-
-
-
- $obj = new MyCloneable();
-
- $obj->name = "Hello";
- $obj->address = "Tel-Aviv";
-
- print $obj->id;
- print "\n";
-
- $obj = $obj->__clone();
-
- print $obj->id;
- print "\n";
- print $obj->name;
- print "\n";
- print $obj->address;
- print "\n";
-?>
-
-Example 8: Unified constructors
-===============================
-
-<?
-
- class BaseClass {
- function __construct()
- {
- print "In BaseClass constructor\n";
- }
- }
-
- class SubClass extends BaseClass {
- function __construct()
- {
- parent::__construct();
- print "In SubClass constructor\n";
- }
- }
-
- $obj = new BaseClass();
-
- $obj = new SubClass();
-
-?>
-
-Example 9: Destructors
-=======================
-
-<?php
-
-class MyDestructableClass {
- function __construct()
- {
- print "In constructor\n";
- $this->name = "MyDestructableClass";
- }
-
- function __destruct()
- {
- print "Destroying " . $this->name . "\n";
- }
-}
-
-$obj = new MyDestructableClass();
-
-?>