继承与多态：

abstract class Animal
{
    abstract public function roar();

    public function speak(){
        echo "I can speak!<br/>";
    }
}

class Pig extends Animal
{
    public function roar()
    {
        echo "I want to roar as honk!<br/>";// TODO: Implement roar() method.
    }

    public function speak()
    {
        parent::speak();
        echo "I can speak honk!<br/>";// TODO: Change the autogenerated stub
    }
}

class Dog extends Animal
{
    public function roar()
    {
       echo "I want to roar as 汪！<br/>";// TODO: Implement roar() method.
    }

    public function speak()
    {
        parent::speak();
        echo "I can speak as 汪！<br/>";// TODO: Change the autogenerated stub
    }
}

class Monkey extends Animal
{
    public function roar()
    {
        echo "I can roar as 嗷呜——<br/>";// TODO: Implement roar() method.
    }

    public function speak()
    {
        parent::speak();
        echo "I can speak as 嗷呜——<br/>";// TODO: Change the autogenerated stub
    }
}

function test(Animal $animal){
    $animal->roar();
    $animal->speak();
}

test(new Pig());

test(new Dog());

test(new Monkey());
/**
 * Created by PhpStorm.
 * User: HP
 * Date: 2017/10/12
 * Time: 14:49

接口作业：

interface iTalkable
{
    public function talk();
}

interface iPlayable
{
    public function play();
}

abstract class People implements iTalkable,iPlayable{
    public function talk()
    {
        echo "Would you like talk with me?<br/>";// TODO: Implement talk() method.
    }
    public function play()
    {
        echo "Would you like play with me?<br/>";// TODO: Implement play() method.
    }
}

class Teacher extends People{
    public function talk()
    {
        parent::talk();
        echo "Yes,I do.<br/>";// TODO: Change the autogenerated stub
    }

    public function play()
    {
        parent::play();
        echo "Yes,I'd like to!<br>";// TODO: Change the autogenerated stub
    }
}

$a = new Teacher;

var_dump($a instanceof Teacher);
echo "<br/>";

function test(People $people){
    $people->play();
    $people->talk();
}

test(new Teacher());
/**
 * Created by PhpStorm.
 * User: HP
 * Date: 2017/10/12
 * Time: 16:11
 */```


trait作业：
```<?php

trait MyTrait{
    public function justTalk(){
        echo "speak from ".__CLASS__."<br/>";

    }
}

class MyClass1{
    public function speak(){
        echo "speak from myclass1" . PHP_EOL;
    }
    use MyTrait;
}
class MyClass2{
    public function speak(){
        echo "speak from myclass2" . PHP_EOL;
    }
    use MyTrait;
}

$myClass1 = new MyClass1();
$myClass1->justTalk();
//output : speak from myClass1

$myClass2 = new MyClass2();
$myClass2->justTalk();
//output : speak from myClass2
/**
 * Created by PhpStorm.
 * User: HP
 * Date: 2017/10/12
 * Time: 16:52
 */```


原地旋转暴风哭泣！！！飓风哭泣！！！