PHP面向对象开发之类中接口的应用(interface、implements)

interface demo {
const NAME = "常量对象属性";

function fun1();
function fun2(); //抽象方法。
}

<?php
interface demo {
 const NAME = "名称";
 function fun1();
 function fun2();
}

interface demo2 {
 function fun3();
 function fun4();
}

interface demo3 {
 const TEST = "Test";
 function fun5();
}

class MyPc implements demo, demo2 {
 function fun1() {
  echo "++++++++++<br />";
 }
 function fun2() {
  echo "----------<br />";
 }
 function fun3() {
  echo "1111111111<br />";
 }
 function fun4() {
  echo "2222222222<br />";
 }
}

class MyPs extends MyPc implements demo3 {
 function fun5() {
  echo "继承类后引用接口";
 }
}
$p = new MyPs;
$p->fun1();
$p->fun2();
$p->fun3();
$p->fun4();
$p->fun5();
?>

<?php
//定义接口
interface User{
    function getDiscount();
    function getUserType();
}
//VIP用户 接口实现
class VipUser implements User{
    // VIP 用户折扣系数
    private $discount = 0.8;
    function getDiscount() {
        return $this->discount;
    }
    function getUserType() {
        return "VIP用户";
    }
}
class Goods{
    var $price = 100;
    var $vc;
    //定义 User 接口类型参数，这时并不知道是什么用户
    function run(User $vc){
        $this->vc = $vc;
        $discount = $this->vc->getDiscount();
 $usertype = $this->vc->getUserType();
        echo $usertype."商品价格：".$this->price*$discount;
    }
}

$display = new Goods();
$display ->run(new VipUser); //可以是更多其他用户类型
?>

class A {}
class B {}

$thing = new A;
if ($thing instanceof A) {
echo "A";
}
if ($thing instanceof B) {
echo "B";
}

<?php
class A {

}

class B {

}

$new = new A;

if ($new instanceof A) {
echo "A";
}
if ($new instanceof B) {
echo "B";
}
?>

<?php
interface MyUsb {
 function type();
 function alert();
}

class Zip implements MyUsb {
 function type() {
  echo "2.0";
 }
 function alert() {
  echo "U盘驱动正在检测……<br />";
 }
}

class Mp3 implements MyUsb {
 function type() {
  echo "1.0";
 }
 function alert() {
  echo "MP3驱动正在检测……";
 }
}

class MyPc {
 function Add_Usb($what) {
  $what->type();
  $what->alert();
 }

}
$p = new MyPc();

$zip = new Zip();

$mp3 = new Mp3();

$p->Add_Usb($zip);
$p->Add_Usb($mp3);
?>

<?php
class BaseClass {
   public function test() {
       echo "BaseClass::test() calledn";
   }
  
   final public function moreTesting() {
       echo "BaseClass::moreTesting() calledn";
   }
}

class ChildClass extends BaseClass {
   public function moreTesting() {
       echo "ChildClass::moreTesting() calledn";
   }
}
// 产生 Fatal error: Cannot override final method BaseClass::moreTesting()
?>

<?php
final class BaseClass {
   public function test() {
       echo "BaseClass::test() calledn";
   }
  
   // 这里无论你是否将方法声明为final，都没有关系
   final public function moreTesting() {
       echo "BaseClass::moreTesting() calledn";
   }
}

class ChildClass extends BaseClass {
}
// 产生 Fatal error: Class ChildClass may not inherit from final class (BaseClass)
?>

< ?php  
class say_const{  
const CHARSET="中国"；  
publice function say_hello()
{  
echo slef::CHARSET;  
}  
}  
$const1=new say_const()  
$const1->say_hello();  
?>  

class MyPc { //声明一个类，定义一个方法MyPc。
public $name; //成员属性。
var $price; //成员属性
function vod() { //成员方法，实现返回字符串功能。
return "test";
}
}

$pc1 = new Mypc(); //实例化
$pc1 -> name;

<?php
class MyPc {

 var $key;
 public $name;

 function vod() {
  echo "hello";
 }

}

$pc1 = new MyPc();
$pc1->key = "10101010";

echo $pc1->key;
?>

class MyPc {
public $name;
public $price;

function vod() {
return "播放电影";
}
....
}

$pc1 = new MyPc();
$pc2 = new MyPc();
$pc3 = new MyPc();

<?php
class MyPc {
 public $name;

 function vod() {
  return $this->name . " 正在播放 未来战警";
 }
 function game() {
  return $this->vod() . " 正在运行 魔兽世界";
 }

}
$pc1 = new MyPc();
$pc2 = new MyPc();

$pc1->name = "1号计算机";
$pc2->name = "2号计算机";
echo $pc1->vod() . "<br />";
echo $pc2->game() . "<br />";
?>

<?php

class MyPc {
 public $name;

 function __construct($name = "") { //初始化。
  $this->name = $name; //把初始化内容第四行的 $name = "" 赋值给 $this 取到的第三行的 public $name;。
 }

 function vod() {
  return $this->name . " 正在播放 未来战警";
 }

 function game() {
  return $this->vod() . " 正在运行 魔兽世界";
 }

}
$pc1 = new MyPc("1号计算机"); //这里进行初始化。
$pc2 = new MyPc("2号计算机");

echo $pc1->vod() . "<br />";
echo $pc2->game() . "<br />";
?>

<?php

class MyPc {
 public $name;

 function __construct($name = "") {
  $this->name = $name;
 }

 function vod() {
  return $this->name . " 正在播放 未来战警";
 }

 function game() {
  return $this->vod() . " 正在运行 魔兽世界";
 }

 function __destruct() { //后进先出。
  echo "<br />垃圾回收机制：" . $this->name . "<br />";
 }

}
$pc1 = new MyPc("1号计算机");
$pc2 = new MyPc("2号计算机");

echo $pc1->vod() . "<br />";
// $pc1 = null; //这里是当特殊需要执行完毕立即回收内存的话，可以使用null。
echo $pc2->game() . "<br />";
?>

<?php
class MyPc {
 public $name; //公共属性
 protected $price; //保护属性

 private function vod() { //私有属性
  $this->name;
 }
  . . .
 }
?>

<?php

class MyPc {
 private $name;
 function __construct($name = "") {
  return $this->name = $name;
 }
 private function open() {
  return $this->name . "---打开电源，正在开机";
 }
 public function ok() {
  return $this->open() . "---OK";
 }
}
$pc = new MyPc("我的电脑");
echo $pc->ok();
?>

<?php

class MyPc {
 private $name;
 public function __construct($name = "") {
  return $this->name = $name;
 }

 public function __get($name) {
  return $this->name . "__get";
 }
 public function __set($n, $v) { //$n对应对象属性$name，$v对应倒数第三行__set。
  $this-> $n = $v;
 }
 private function open() {
  return $this->name . "---打开电源，正在开机";
 }
 public function ok() {
  return $this->open() . "---OK";
 }
}
$pc = new MyPc("我的电脑");
$pc->name = "__set";
echo $pc->name;
?>

class MyPc {
...
}

class Home extends MyPc {
...
}

<?php
class Root {
 public function print1() {
  return "Root_print";
 }
}

class Son extends Root {
 public function print2() {
  return "Son_print";
 }
}

$p = new Son();
echo $p->print1();
?>

<?php

class Root {
 public function print1() {
  return "Root_print";
 }
}

class Son extends Root {
 public function print1() {
  return Root :: print1() . "<br />Son_print";
 }
}

$p = new Son();
echo $p->print1();
?>

<?php
abstract class ChouXiang {
 abstract function fun1();

}

class PaiShengLei extends ChouXiang {
 public function fun1() { //重载
  echo "test";
 }
}

$p = new PaiShengLei();
$p->fun1();
?>

<?php
declare(ticks = 1);
function a()
{
    sleep(10);
    echo "a finishin";
}
function b()
{
    echo "Stopn";
}
function c()
{
    usleep(100000);
}
 
function sig()
{
    throw new Exception;
}
 
try
{
    //设置一个闹钟信号为一秒钟执行一次
    pcntl_alarm(1);
    //安装闹钟信号，并绑定callback
    pcntl_signal(SIGALRM, "sig");
    a();
    //取消闹钟信号
    pcntl_alarm(0);
}
catch(Exception $e)
{
    echo "timeoutn";
}
 
b();
a();
b();