<?php
header('Content-Type:text/html;charset=utf-8');
//抽象类
abstract class Humanity {
public $name;
public $sex;
public $iq=10;
protected $money;
protected $dna;
const BIRTHPLACE='地球';
static public $counter=0;//静态属性，它是公共的资源和具体的实例没有关系
//构造函数
public function __construct($name,$sex){
self::$counter ;
$this->name=$name;
$this->sex=$sex;
}
protected function chew($food){
echo "<p>{$food}已经被咀嚼完成！</p>";
}
//抽象方法
abstract public function eat($food);
static public function hello(){
echo '<p>您好！我是来自'.self::BIRTHPLACE.'的人类</p>';
}
}
class Student extends Humanity {
const BIRTHPLACE='火星';
public $studentId;
public function test($subject){
echo "<p>{$this->name}正在考{$subject}！</p>";
}
public function eat($food){
$this->chew($food);
echo "<p>{$this->name}正在快速的吃{$food}！</p>";
}
/*public function walkTheDog(Dog $a){
echo "作用是只能传过来Dog类的实例（对象）过来";
}*/
/*public function walkTheDog(array $a){
echo "作用是只能传过来数组过来";
}
*/
public function walkTheDog(callable $a=null){
echo "作用是只能传过来函数过来,注意：不想让他报错的话，的设置默认值null哦,注意：每一种运行，其他的都得注释哦比如函数运行，类的实例 数组的注释";
}
}
interface Dog {
}
class Huskies implements Dog {
}
function func1(){
echo ':))';
}
$hanMM=new Student('韩梅梅','女');
$wW=new Huskies();
echo $hanMM->walkTheDog($hanMM->eat());
