//類的作用域final:將阻止子類重寫這個(gè)字段
//方法的作用域abstract: 在父類中聲明，在子類中實(shí)現(xiàn)
//定義類：
class Employee{
//定義字段
private $name;
protected $title;
public $wage;
//常量
const PI = 3.1415926;
//靜態(tài)成員變量
private static $visitors = 0;
//定義構(gòu)造函數(shù)
function __construct(){
//使用靜態(tài)成員變量
self::$visitors++;
echo "constructor";
}
//定義析構(gòu)函數(shù)
function __destruct(){
echo "destruct";
}
//聲明方法
public function clockIn(){
//使用字段
echo "Member $this->name";
}
//在訪問一個(gè)對(duì)象并不擁有的屬性時(shí)(比如私有字段)，如果該對(duì)象用戶__get和__set方法，則會(huì)自動(dòng)調(diào)用__get方法或__set方法
function __set($property,$value){
$this->$property = $value;
}
function __get($property){
return $this->$property;
}
}
//類的繼承 Manager繼承Employee
class Manager extends Employee {
function __construct(){
//調(diào)用父類的構(gòu)造函數(shù)或方法
parent::__construct();
parent::clockIn();
echo "Manager constructor";
}
}
//創(chuàng)建對(duì)象
$employee = new Employee();
$employee->wage = 10000;
//使用常量
echo Employee::PI;
//調(diào)用方法
$employee->clockIn();
$manager = new Employee();
//instanceof判斷一個(gè)對(duì)象是類的實(shí)例、類的子類，還是實(shí)現(xiàn)了某個(gè)特定接口
if($manager instanceof Employee ) echo "Yes";

//對(duì)象克隆
class ClassA{
private $name;
private $title;
public function setName($name){
$this->name = $name;
}
function getName(){
return $this->name;
}
public function setTitle($title){
$this->title = $title;
}
public function getTitle(){
return $this->title;
}
function __clone(){
echo "我被克隆了","<br>";
}
}
$classA = new ClassA();
$classA->setName("NameA");
$classA->setTitle("TitleA");
$classB = clone $classA;
$classB->setName("NameB");
echo $classA->getName(),"<br>",$classA->getTitle(),"<br>";
echo $classB->getName(),"<br>",$classB->getTitle(),"<br>";
/* output
我被克隆了
NameA
TitleA
NameB
TitleA
*/

//接口
interface IPillage{
function method();
}
class ClassC extends ClassA implements IPillage {
function method(){
echo "inteface method";
}
}
$classC = new ClassC();
$classC->method();
//inteface method

//抽象類，是不能實(shí)例化的類，只能作為其它類繼承的基類
abstract class BaseClass{
protected $name;
abstract function method();
}
class ChileClass extends BaseClass {
function method(){
echo "method";
}
}
$child = new ChileClass();
$child->method();
//output method