PHP面向对象编程
1.全局变量
<?php
class MyClass{
static $myStaticVariable=0;
function myMethod(){
print self::$myStaticVariable;
}
}
$obj=new MyClass();
$obj->myMethod();
?>
2.全局变量改变
<?php
class MyClass{
static $myStaticVariable=0;
public $uniqueId;
function __construct(){
self::$myStaticVariable++;
$this->uniqueId=self::$myStaticVariable;
}
}
$obj1=new MyClass();
print $obj1->uniqueId." ";
$obj2=new MyClass();
print $obj2->uniqueId;
?>
3.静态方法
<?php
class MyClass{
static function printHelloWorld(){
print "hello world ";
self::printMe();
}
static function printMe(){
print " zhuchengdie";
}
}
MyClass::printHelloWorld();
?>
4.继承
<?php
class MyClass{
static function printHelloWorld(){
print "hello world ";
self::printMe();
}
static function printMe(){
print " tony";
}
}
class Child extends MyClass{
function __construct(){
parent::printHelloWorld();
}
}
$child=new Child();
?>
5.枚举
<?php
class MyClass{
const RED="Red";
const GREEN="Green";
const BLUE="Blue";
function printBlue(){
print self::BLUE;
}
}
print MyClass::GREEN;
$obj=new MyClass();
$obj->printBlue();
?>
6.对象的引用
<?php
class MyClass{
public $var=1;
}
$obj1=new MyClass();
$obj2=$obj1;
$obj2->var=2;
print $obj1->var;
?>
打印2
7.克隆
<?php
class MyClass{
public $var=1;
}
$obj1=new MyClass();
$obj2=clone $obj1;
$obj2->var=2;
print $obj1->var;
?>
打印1
8.多态
<?php
class Cat{
function miao(){
print "miao";
}
}
class Dog{
function wangwang(){
print "wangwang";
}
}
function printRightSound($obj){
if($obj instanceof Cat){
$obj->miao();
}else if($obj instanceof Dog){
$obj->wangwang();
}else{
print "Error comes";
}
print "<br>";
}
printRightSound(new Cat());
printRightSound(new Dog());
?>
9.多态与继承
<?php
class
Animal{function makeSound(){
print "I‘ m other‘s father";
}
}
class
Cat extends Animal{function makeSound(){
print "miao";
}
}
class
Dog extends Animal{function makeSound(){
print "wangwang";
}
}
function
printRightSound($obj){if($obj instanceof Animal){
$obj->makeSound();
}else{
print "Error comes";
}
print "<br>";
}
printRightSound(new Cat());
printRightSound(new Dog());
?>
10.parent::和self::
<?php
class
.Ancestor{
const NAME="Ancestor";
function __construct(){
print "In ".self::NAME." constructor<br>";
}
}
class
Child extends Ancestor{const NAME="Child";
function __construct(){
parent::__construct();
print "In ".self::NAME." constructor";
}
}
$obj=new Child();
?>
11.抽象
<?php
abstract class
MyClass{abstract function draw();
}
class
Square extends MyClass{function draw(){
}
}
class
Circle extends MyClass{function draw(){
}
}
?>
12.接口
<?php
interface
MyClass{function draw();
}
class
Square implements MyClass{function draw(){
}
}
class
Circle implements MyClass{function draw(){
}
}
但是接口是允许多重继承的：
interface
No1 extends No2,No3,…{}与类实现接口类似，一个接口只能继承与自己互相不冲突的接口（也就是说，如果No2定义了No1已经定义的方法或者常量，我们将会收到报错信息）。
?>
13.toString()方法
<?php
class
MyClass{function __construct($name){
$this->name=$name;
}
private $name;
function __toString(){
return $this->name;
}
}
$obj=new MyClass("tony");
?>
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