【十六】php 面向对象

__set()方法:

语法:

function __set($property, $value) {

 

//$property接收的属性的名字

 

//$value接收的是属性的值

 

}

 

 1     class Employee{
 2         public $name;
 3         private $head;
 4         protected $body;
 5         function __set($propName,$propValue){
 6             echo $propName."<br/>";
 7             echo $propValue."<br/>";
 8         }
 9     }
10     $employee=new Employee();
11     $employee->name="mario";    //公共属性
12     $employee->title="executive chef";    //在Employee类中不存在的属性
13     $employee->head="my head";    //私有属性
14     $employee->body="my body";    //私有属性

__get()方法:

语法:

 

funciton __set($property) {

 

//$property接收的是属性的名字

 

}

 

 1     class Employee{
 2         public $publicname;
 3         public $city;
 4         protected $protectedvalue=15;
 5         private $privatevalue;
 6         function __get($propName){
 7             echo "__get called<br/>";
 8             $vars=array("publicname","city","protectedvalue");
 9             if (in_array($propName, $vars)) {
10                 return $this->$propName."<br/>";
11             }else{
12                 return "no such variable<br/>";
13             }
14         }
15     }
16     $employee=new Employee();
17     $employee->publicname="huahua";
18     echo $employee->publicname."<br/>";    //公共属性
19     echo $employee->nothingvalue;    //在Employee类中不存在的属性
20     echo $employee->protectedvalue;    //私有属性
21     echo $employee->privatevalue;    //私有属性

 

总结:从上图可以看出。

1.如果没有__set()和__get()方法,访问一个类中不存在的属性或没有访问权限的属性时,会报严重错误

2.当实例化一个对象后,调用类中不存在或者没有权限访问(protected、private)的属性的时候,php会默认调用__get()、__set()方法

3.属性为public,也会调用__get()和__set()方法

使用面向对象 写一个个人主页

page.inc.php

  1 <?php
  2     class page{
  3         public $content;
  4         public $title="tla consulting pty ltd";
  5         public $keywords="tla consulting,three latter abbreviation,some of my best friends are search engines";
  6         public $buttons=array("home"=>"home.php",
  7                             "contact"=>"contact.php",
  8                             "services"=>"services.php",
  9                             "site map"=>"map.php"
 10             );
 11         public function __set($name,$value){
 12             $this->name=$value;
 13         }
 14         public function display(){
 15             echo "<html>\n<head>\n";
 16             $this->displaytitle();
 17             $this->displaykeywords();
 18             $this->displaystyles();
 19             echo "</head>\n<body>\n";
 20             $this->displayheader();
 21             $this->displaymenu($this->buttons);
 22             echo $this->content;
 23             $this->displayfooter();
 24             echo "</body>\n</html>\n";
 25         }
 26         public function displaytitle(){
 27             echo "<title>".$this->title."</title>";
 28         }
 29         public function displaykeywords(){
 30             echo "<meta name=\"keywords\" content=\"".$this->keywords."\"/>";
 31         }
 32         public function displaystyles(){
 33             ?>
 34             <style>
 35                 h1{
 36                     color:white;font-size:24pt;text-align:center;
 37                     font-family:arial,sans-serif
 38                 }
 39                 .menu{
 40                     color:white;font-size:12pt;text-align:center;
 41                     font-family:arial,sans-serif;font-weight:bold
 42                 }
 43                 td{
 44                     background:black
 45                 }
 46                 p{
 47                     color:black;font-size:12pt;text-align:justify;
 48                     font-family:arial,sans-serif
 49                 }
 50                 p.foot{
 51                     color:white;font-size:9pt;text-align:center;
 52                     font-family:arial,sans-serif;font-weight:bold
 53                 }
 54                 a:link,a:visited,a:activep{
 55                     color:white
 56                 }
 57             </style>
 58             <?php
 59         }
 60         public function displayheader(){
 61             ?>
 62             <table width=100% cellpadding="12" cellspacing="0" border="0">
 63                 <tr bgcolor="black">
 64                     <td align="left"><img src="logo.jpg"/></td>
 65                     <td>
 66                         <h1>huahua's page</h1>
 67                     </td>
 68                     <td align="right"><img src="logo.jpg"/></td>
 69                 </tr>
 70             </table>
 71             <?php
 72         }
 73         public function displaymenu($buttons){
 74             echo "<table width=\"200\" bgcolor=\"white\" cellpadding=\"4\"cellspacing=\"4\">\n";
 75             echo "<tr>\n";
 76             $width=200/count($buttons);
 77             while (list($name,$url)=each($buttons)) {
 78                 //注意: !$this->IsURLCurrentPage 
 79                 $this->displaybutton($width,$name,$url,!$this->IsURLCurrentPage($url));
 80             }
 81             echo "</tr>\n";
 82             echo "</table>\n";
 83         }
 84         public function IsURLCurrentPage($url){
 85             //判断这个url是否指向当前页面.
 86             //如果指向当前页面返回true
 87             if (strpos($_SERVER['PHP_SELF'],$url)==false) {
 88                 return false;
 89             }else{
 90                 return true;
 91             }
 92         }
 93         public function displaybutton($width,$name,$url,$active=true){
 94             if ($active) {
 95                 echo "<td width=\"".$width."%\">
 96                 <a href=\"".$url."\">
 97                 <img src=\"s-logo.jpg\" alt=\"".$name."\" border=\"0\"/></a>
 98                 <a href=\"".$url."\"><span class=\"menu\">".$name."</span></a>
 99                 </td>";
100             }else{
101                 echo "<td width=\"".$width."%\">
102                 <img src=\"side-logo.jpg\"><span class=\"menu\">".$name."</span></td>";
103             }
104         }
105         public function displayfooter(){
106             ?>
107             <table width="100%" bgcolor="black" cellpadding="12" border="0">
108                 <tr>
109                     <td>
110                         <p class="foot">&copy;tla consulting pty ltd.</p>
111                         <p class="foot">please see our<a href="">legal infotmation page</a></p>
112                     </td>
113                 </tr>
114             </table>
115             <?php
116         }
117     }
118     ?>

home.php

1 <?php
2     require('page.inc.php');
3     $homepage=new page();
4     $homepage->title="huahua girl is best!";
5     $homepage->content="huahua girl have good good study,day day up!!!";
6     $homepage->display();
7 ?>

service.php

 1 <?php
 2     require('page.inc.php');
 3     class servicespage extends page{
 4         private $roe2buttons=array(
 5             "reengineering"=>"reengineering.php",
 6             "standards compliance"=>"standards.php",
 7             "buzzword conliance"=>"buzzword.php",
 8             "mission statements"=>"mission.php"
 9             );
10         //继承了page类 新增了及格菜单
11         public function display(){
12             echo "<html>\n<head>\n";
13             $this->displaytitle();
14             $this->displaykeywords();
15             $this->displaystyles();
16             echo "</head>\n<body>\n";
17             $this->displayheader();
18             $this->displaymenu($this->buttons);
19             $this->displaymenu($this->roe2buttons);
20             echo $this->content;
21             $this->displayfooter();
22             echo "</body>\n</html>\n";
23         }
24     }
25     $service=new servicespage();
26     $service->content="<p>this is service page</p>";
27     $service->display();
28 ?>

界面显示:

posted @ 2017-11-25 17:09  花花妹子。  阅读(191)  评论(0编辑  收藏  举报