1 <?php
 2 
 3 class Mouse
 4 {
 5     private $color;
 6     public $sex;
 7 
 8     public function __construct($role){
 9         switch($role){
10             case ‘pa‘:
11                 $this->color = ‘black‘;
12                 $this->sex = ‘male‘;
13                 break;
14             case ‘ma‘:
15                 $this->color = ‘white‘;
16                 $this->sex = ‘female‘;
17                 break;
18             default:
19                 throw new Exception(‘pa Or ma,please!‘);
20         }
21     }
22 
23     public function getColor(Mouse $mouse){
24         if($mouse->sex == $this->sex){
25             var_dump($this->color);
26         }else{
27             var_dump(‘*****‘);
28         }
29     }
30 
31     public function mateWithMa(Mouse $ma){
32         if($this->sex == ‘male‘ && $ma->sex = ‘female‘){
33             var_dump(‘You have been trust by ma‘);
34             $ma->color = $this->color;
35             var_dump("success to mate! ma‘s color :" .($ma->color));
36         }
37     }
38 
39     public function mateWithPa(Mouse $pa){
40         if($this->sex == ‘female‘ && $pa->sex == ‘male‘){
41             var_dump(‘You have been trust by pa‘);
42             $pa->color = $this->color;
43             var_dump("success to mate! pa‘s color :" .($pa->color));
44         }
45     }
46 }
47 
48 var_dump(‘The First Couple :‘);
49 $pa1 = new Mouse(‘pa‘);
50 $ma1 = new Mouse(‘ma‘);
51 $pa1->mateWithMa($ma1);
52 $ma1->mateWithPa($pa1);
53 
54 echo "\n";
55 
56 var_dump(‘The Second Couple :‘);
57 $pa2 = new Mouse(‘pa‘);
58 $ma2 = new Mouse(‘ma‘);
59 $ma2->mateWithPa($pa2);
60 $pa2->mateWithMa($ma2);