class Ren{    private $name;    private $sex;    private $age; //年龄必须在18-50之间        function __construct($v)    {        $this->sex = $v;    }    //魔术方法set    function __set($n,$v)    {        if($n=="age")        {            if($v>=18 && $v<=50)            {                $this->$n = $v;            }        }        else         {            $this->$n = $v;        }    }        //魔术方法get    function __get($n)    {        return $this->$n;    }        /*//设置age的值    function setage($a)    {        if($a>=18 && $a<=50)        {            $this->age = $a;        }    }    //获取age的值    function getage()    {        return $this->age;    }*/        function say()    {            echo "hello";     }        //析构方法    function __destruct()    {        echo "这是一个析构方法";    }        function __tostring()    {        return "这个类是人类";    }        }$r = new Ren("男");//$r->setage(20);//echo $r->getage();$r->say();//$r->age = 30;//echo $r->age;//$r->__get("age");//$r->__set("age",20);var_dump($r);

 

计算器 111111111111111

$a = 10;

$b = 5;

$jia = $a+$b;

$jian = $a-$b;

$cheng = $a*$b;

$chu = $a/$b

22222222222222222222222class jisuan{public $a;public $b;function __construct($n,$m){$this->a = $n;$this->b = $m;}function jia(){return $this->a+$this->b;}function jian(){return $this->a-$this->b;}function cheng(){return $this->a*$this->b;}function chu(){return $this->a/$this->b;}function quyu(){return $this->a%$this->b;}}$j = new jisuan(10,5); echo $j->quyu();