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PHP重载：属性拦截器，构造函数
阿心
Original
823 people have browsed it

重载：访问拦截器

  1. <?php
  2. //重载：访问拦截器（属性，方法拦截器）
  3. //访问不存在或无权限属性/方法自动调用
  4. // 属性拦截器 __set() , __get(), __isset() ,__unset()
  5. //// 构造方法: __construct(), 是类的实例化过程中被自动调用, new 的时候
  6. //再次注意：构造函数不能是静态
  8. class Demo
  9. {
  10.     private $brand;
  11.     private $model;
  12.     protected $price;
  13.     public function __construct($brand,$model,$price)
  14.     {
  15.         $this->brand=$brand;
  16.         $this->model=$model;
  17.         $this->price=$price;
  18.     }
  20.     //创建属性拦截器
  21.     public function __get($accept)
  22.     {
  23.         $attri='get'.ucfirst($accept);
  24.         return method_exists($this,$attri) ? $this->$attri() : null;
  25.     }
  26.     private function getBrand()
  27.     {
  28.         return "品-牌：".mb_substr($this->brand,0,1).'*';
  29.     }
  30.     private function getModel()
  31.     {
  32.         return "<br>型-号：".substr($this->model,0,3).'*';
  33.     }
  34.     private function getPrice()
  35.     {
  36.         return "价-格：".$this->price;;
  37.     }
  39.     //设置拦截器
  40.     public function __set($accept,$val)
  41.     {
  42.         $attri='set'.ucfirst($accept);
  43.         return method_exists($this,$attri) ? $this->$attri($val):null;
  44.     }
  45.     private function setBrand($val)
  46.     {
  47.         $this->brand=trim($val);
  48.     }
  49.     private function setModel($val)
  50.     {
  51.         $this->model=trim($val);
  52.     }
  53.     private function setPrice($val)
  54.     {
  55.         $this->price=$val;
  56.         // var_dump($val);
  57.     }
  59.     public function __isset($accept)
  60.     {
  61.         $attri='isset'.ucfirst($accept);
  62.         return method_exists($this,$attri) ? $this->$attri() : null;
  63.     }
  64.     private function issetBrand()
  65.     {
  66.         return $this->brand;
  67.     }
  68.     private function issetModel()
  69.     {
  70.         return $this->model;
  71.     }
  72.     private function issetPrice()
  73.     {
  74.         return isset($this->price);
  75.     }
  76.     //删除拦截器
  77.     public function __unset($accept)
  78.     {
  79.         if($accept==='brand')
  80.         {
  81.         $attri='set'.ucfirst($accept);
  82.         if(method_exists($this,$attri)) return $this->$attri(null);
  83.         }
  84.     }
  86. }
  87. //属性拦截器
  88. $demo=new Demo('啊为','pro20','请 ->商——家');
  89. echo $demo->barnd;
  91. ?>

简单熟悉下PHP混写html代码

  1. <html>
  2. <body>
  3.     <style>
  4.         table{border:0px;cellspacing:2px;cellpadding:2px;background:#FF00FF;width:200px}
  5.         TR{ BACKGROUND:#ccd}
  6.         TD{padding:0;margin:0;text-align:center}
  7.     </style>
  8.     <table >
  9.         <tr>
  10.             <td style="background:#FFF">属性拦截器</td>
  11.         </tr>
  12.         <tr>
  13.             <td><?php echo $demo->brand;?></td>
  14.         </tr>
  15.         <tr>
  16.             <td><?php echo $demo->model;?></td>
  17.         </tr>
  18.         <tr>
  19.             <td><?php echo $demo->price; ?></td>
  20.         </tr>
  21.         <?php
  22.         $demo->brand="米米";
  23.         $demo->model="Note 3";
  24.         $demo->price="999";
  25.         ?>
  26.         <tr>
  27.             <td style="background:#FFF">设置拦截器</td>
  28.         </tr>
  29.         <tr>
  30.             <td><?php echo $demo->brand; ?></td>
  31.         </tr>
  32.         <tr>
  33.             <td><?php echo $demo->model; ?></td>
  34.         </tr>
  35.         <tr>
  36.             <td><?php echo $demo->price; ?></td>
  37.         </tr>
  39.         <tr>
  40.             <td style="background:#FFF">属性检测拦截器</td>
  41.         </tr>
  42.         <tr>
  43.             <td><?php echo isset($demo->brand) ? '品-牌：存在':'品-牌：不存在'; ?></td>
  44.         </tr>
  45.         <tr>
  46.             <td><?php echo isset($demo->moddel) ? '型-号：存在':'型-号：不存在'; ?></td>
  47.         </tr>
  48.         <tr>
  49.             <td><?php echo isset($demo->pricde) ? '价-格：存在':'价-格：不存在'; ?></td>
  50.         </tr>
  51.         <?php
  52.         unset($demo->brand);
  53.         ?>
  54.         <tr>
  55.             <td style="background:#FFF">删除属性截器</td>
  56.         </tr>
  57.         <tr>
  58.             <td><?php echo $demo->brand; ?></td>
  59.         </tr>
  60.         <tr>
  61.             <td><?php echo $demo->model; ?></td>
  62.         </tr>
  63.         <tr>
  64.             <td><?php echo $demo->price; ?></td>
  65.         </tr>
  67.     </table>
  68. </body>
  69. </html>

总结：这重载实在太难，反复研究就是不知道这个为什么，那个又为什么！好了，现在有初步的认识了，不过还是不熟悉。最后销毁这个没有研究出来！！方法拦截器再研究另外在发，应该比这个属性拦截器要简单易懂一点！！！！！！！！！！！！###总结：这重载实在太难，反复研究就是不知道这个为什么，那个又为什么！好了，现在有初步的认识了，不过还是不熟悉。最后销毁这个没有研究出来！！方法拦截器再研究另外在发，应该比这个属性拦截器要简单易懂一点！！！！！！！！！！！！

Correcting teacher：天蓬老师天蓬老师

Correction status：qualified

Teacher's comments：不必重复内容
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