<?php

class Person{     public $name;    public $age;    function __construct($name,$age) {         $this->name=$name;        $this->age=$age;    }    function __destruct(){     echo"{$this->name}消失";    }    function say(){         echo "我叫{$this->name},我今年{$this->age}岁<br>";        return $this;    }    function eat(){         echo "{$this->name}正在吃饭<br>";        return $this;    }    function sleep(){         echo "{$this->name}正在睡觉<br>";    }     public $sex="男";    function zuoshi(){         echo"{$this->name}的性别是{$this->sex}的<br>";    }}$Person_1=new Person("傅超","20");$Person_1->say()->zuoshi();$Person_2=new Person("吴慧颖","19");$Person_2->say()->eat()->sleep();?>