php面向对象特性小例

  1. 对象链原理 
     1 class Person
 2 {
 3     public function find(){
 4         echo 'find<br>';
 5         return $this;
 6     }
 7     public function attr(){
 8         echo 'attr<br>';
 9         return $this;
10     }
11     public function parent(){
12         echo 'parent<br>';
13         return $this;
14     }
15     public function css(){
16         echo 'css';
17     }
18 }
19 
20 $obj = new Person();
21 $obj->find()->attr()->parent()->css();

     

  2. 继承特性 
     1 class Person
 2 {
 3     public $name;
 4     public $age;
 5     
 6     function __construct($n,$a)
 7     {
 8         $this->name = $n;
 9         $this->age = $a;
10     }
11 
12     public function say(){
13         echo "<p>my name is {$this->name},the age is {$this->age}</p>";
14     }
15 }
16 
17 class It extends Person
18 {
19     public $soft;
20     function __construct($n,$a,$s)
21     {
22         parent::__construct($n,$a);
23         $this->soft = $s;
24     }
25 
26     public function soft(){
27         echo "<p>{$this->name}正在开发{$this->soft}软件</p>";
28     }
29 }
30 
31 $obj = new It('yu',30,'PHP');
32 $obj->say();
33 $obj->soft();

     

  3. 封装特性 
     1 class Counter
 2 {
 3     private $n1;
 4     private $n2;
 5     public function __construct($n1,$n2)
 6     {
 7         $this->n1 = $n1;
 8         $this->n2 = $n2;
 9     }
10 
11     private function getSum(){
12         return $this->n1+$this->n2;
13     }
14 
15     private function getProduct(){
16         return $this->n1*$this->n2;
17     }
18 
19     public function getReturn(){
20         return $this->getProduct()-$this->getSum();
21     }
22 }
23 
24 $obj = new Counter(5,5);
25 echo $obj->getReturn();

     

posted @ 2019-04-14 22:15  yach_yu  阅读(200)  评论(0)  编辑  收藏  举报