1     class Person{
 2         private $name;
 3         private $age;
 4         private $sex;
 5         public  function __construct($name,$age,$sex){
 6             $this->name=$name;
 7             $this->age=$age;
 8             $this->sex=$sex;
 9         }
10         function __isset($key){
11              return  isset($this->$key);
12         }
13         function __unset($name){
14             if($name=="name"){
15                 echo "<span style='color:red;'>删除不掉name</span><br>";
16                 return;
17             }
18               unset($this->$name);
19               return;
20         }
21         function __set($key,$value){
22             if($key=="name"){
23                 $this->$key=$value."这是set出的。";
24                 return;
25             }
26                 $this->$key=$value;
27         }
28         function setAge($age){
29             if($age<=120&&$age>=0){
30                 $this->age =$age;
31             }else{
32              error_log("年龄设置有误");
33             }
34         }
35         function getAge($age){
36             return "但是我永远18岁，哈哈哈哈哈哈。" ;
37         }
38         function __get($key){
39             return $this->$key."hahahah";
40         }
41         private function formateName(){
42             return "我叫{$this->name},我今年{$this->age}岁了！<br>";
43         }
44         public function say(){
45             echo $this->formateName();
46         }
47     }
48     $zhangsan = new Person("张三丰",14,"男");
49     //$zhangsan->setAge(99);
50     //$zhangsan->say();
51     //echo $zhangsan->getAge("88");
52     //$zhangsan->name="李四"；
53     // $zhangsan->name="李四";
54      echo $zhangsan->name;
55      echo $zhangsan->age;
56     var_dump(isset($zhangsan->age));
57     unset($zhangsan->age);

 1 class Person{
 2         public    $name;
 3         public $sex;
 4
 5
 6
 7         public function __construct($name,$sex){
 8             $this->name=$name;
 9             $this->sex=$sex;
10         }
11
12         public function say(){
13             echo "我叫{$this->name},我是{$this->sex}生!  <br> ";
14         }
15     }
16
17     class Student extends Person{
18         public $school;
19         public function __construct($school){
20             $this->school=$school;
21         }
22
23         public function say(){
24             parent::say();
25             echo "我叫{$this->name},我是{$this->sex}生!  <br> ";
26         }
27         function say1(){
28             echo "今天下雨了，啦啦啦啦啦。<br>";
29         }
30     }
31
32     $lalala = new Student("每天学习");
33     $lalala->name= "lalala";
34     $lalala->sex="不详";
35     $lalala->say();
36     $lalala->say1();

 1  abstract class Person{
 2
 3             abstract function say();
 4             function say1(){
 5                 echo "我是Say1";
 6             }
 7         }
 8         class Chinese extends Person{
 9             function say(){
10                 echo "我是一个中国人<br>";
11             }
12         }
13           class English extends Person{
14             function say(){
15                 echo "I'am a English";
16             }
17         }
18
19     /*$a = new Chinese();
20     $a->say();
21
22     $b = new English();
23     $b->say();    */
24
25     function func(Person $p){
26         $p->say();
27     }