【十六】php 面向对象
2024-04-17 12:24:43
__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
<?php
class page{
public $content;
public $title="tla consulting pty ltd";
public $keywords="tla consulting,three latter abbreviation,some of my best friends are search engines";
public $buttons=array("home"=>"home.php",
"contact"=>"contact.php",
"services"=>"services.php",
"site map"=>"map.php"
);
public function __set($name,$value){
$this->name=$value;
}
public function display(){
echo "<html>\n<head>\n";
$this->displaytitle();
$this->displaykeywords();
$this->displaystyles();
echo "</head>\n<body>\n";
$this->displayheader();
$this->displaymenu($this->buttons);
echo $this->content;
$this->displayfooter();
echo "</body>\n</html>\n";
}
public function displaytitle(){
echo "<title>".$this->title."</title>";
}
public function displaykeywords(){
echo "<meta name=\"keywords\" content=\"".$this->keywords."\"/>";
}
public function displaystyles(){
?>
<style>
h1{
color:white;font-size:24pt;text-align:center;
font-family:arial,sans-serif
}
.menu{
color:white;font-size:12pt;text-align:center;
font-family:arial,sans-serif;font-weight:bold
}
td{
background:black
}
p{
color:black;font-size:12pt;text-align:justify;
font-family:arial,sans-serif
}
p.foot{
color:white;font-size:9pt;text-align:center;
font-family:arial,sans-serif;font-weight:bold
}
a:link,a:visited,a:activep{
color:white
}
</style>
<?php
}
public function displayheader(){
?>
<table width=100% cellpadding="12" cellspacing="0" border="0">
<tr bgcolor="black">
<td align="left"><img src="logo.jpg"/></td>
<td>
<h1>huahua's page</h1>
</td>
<td align="right"><img src="logo.jpg"/></td>
</tr>
</table>
<?php
}
public function displaymenu($buttons){
echo "<table width=\"200\" bgcolor=\"white\" cellpadding=\"4\"cellspacing=\"4\">\n";
echo "<tr>\n";
$width=200/count($buttons);
while (list($name,$url)=each($buttons)) {
//注意： !$this->IsURLCurrentPage
$this->displaybutton($width,$name,$url,!$this->IsURLCurrentPage($url));
}
echo "</tr>\n";
echo "</table>\n";
}
public function IsURLCurrentPage($url){
//判断这个url是否指向当前页面.
//如果指向当前页面返回true
if (strpos($_SERVER['PHP_SELF'],$url)==false) {
return false;
}else{
return true;
}
}
public function displaybutton($width,$name,$url,$active=true){
if ($active) {
echo "<td width=\"".$width."%\">
<a href=\"".$url."\">
<img src=\"s-logo.jpg\" alt=\"".$name."\" border=\"0\"/></a>
<a href=\"".$url."\"><span class=\"menu\">".$name."</span></a>
</td>";
}else{
echo "<td width=\"".$width."%\">
<img src=\"side-logo.jpg\"><span class=\"menu\">".$name."</span></td>";
}
}
public function displayfooter(){
?>
<table width="100%" bgcolor="black" cellpadding="12" border="0">
<tr>
<td>
<p class="foot">©tla consulting pty ltd.</p>
<p class="foot">please see our<a href="">legal infotmation page</a></p>
</td>
</tr>
</table>
<?php
}
}
?>
home.php
<?php
require('page.inc.php');
$homepage=new page();
$homepage->title="huahua girl is best!";
$homepage->content="huahua girl have good good study,day day up!!!";
$homepage->display();
?>
service.php
<?php
require('page.inc.php');
class servicespage extends page{
private $roe2buttons=array(
"reengineering"=>"reengineering.php",
"standards compliance"=>"standards.php",
"buzzword conliance"=>"buzzword.php",
"mission statements"=>"mission.php"
);
//继承了page类 新增了及格菜单
public function display(){
echo "<html>\n<head>\n";
$this->displaytitle();
$this->displaykeywords();
$this->displaystyles();
echo "</head>\n<body>\n";
$this->displayheader();
$this->displaymenu($this->buttons);
$this->displaymenu($this->roe2buttons);
echo $this->content;
$this->displayfooter();
echo "</body>\n</html>\n";
}
}
$service=new servicespage();
$service->content="<p>this is service page</p>";
$service->display();
?>
界面显示：
最新文章
- JS控制，返回上一页之后强行刷新一次
- qt 导入现有的工程不能运行的问题
- 【代码笔记】iOS-对iphone手机进行判断的一些函数
- faster with MyISAM tables than with InnoDB or NDB tables
- 运用cookie登陆人人网爬取数据
- JS获取日期和时间
- mysql中的unique
- Word Ladder 解答
- 如何优化运行在webkit上的web app
- Redis[三] @Hash 哈希
- SpringBoot学习之mvc
- SpringCloud实战-Hystrix请求熔断与服务降级
- UEditor调用上传图片、上传文件等模块
- shell 的多进程
- midi文件格式
- Python 创建和使用类
- django admin管理后台中文添加问题
- 内核漏洞学习—熟悉HEVD
- The 12 Most Controversial Facts In Mathematics
- 周记【距gdoi：91天】