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Homephp教程php手册php类中的各种拦截器用法分析,php类拦截用法

php类中的各种拦截器用法分析,php类拦截用法

本文实例讲述了php类中的各种拦截器用法。分享给大家供大家参考。具体用法分析如下:

1、__get( $property ) 访问未定义的属性时调用

复制代码 代码如下:

class lanjie 

    function __get($name) 
    { 
        echo $name." property not found! "; 
    } 

$ob = new lanjie(); 
echo $ob->g;

当我们调用对象$ob未定义的属性g时,调用拦截器__get()方法,输出"g property not found!”;

2、__set( $property , $value ) 给未定义的属性调用时赋值

复制代码 代码如下:

class person 

    private $_age; 
    private $_name; 
    function __set($name, $value) 
    { 
        $method = "set".  ucfirst($name); 
        echo $method; 
        if(method_exists($this, $method) ) 
        { 
            return $this->$method( $value ); 
        } 
    } 
     
    function setName( $name ) 
    { 
        $this->_name = $name; 
        if( !is_null($this->_name) ) 
        { 
            $this->_name = strtoupper($this->_name); 
        } 
    } 
    function setAge( $age ) 
    { 
        return $this->_age = (int)$age; 
    } 

 
$p = new person(); 
$p->name = 'bob'; 
print_r( array( $p ) );

这里我们可以很清楚的看到 , 当给未定义的'name'赋值时 ,  会调用"__set()”

其他的还有 __call(), __isset() , __unset();
这里最有用和最常用的的是__call() , 当调用一个为存在的方法时被调用; __isset()是在对一个为定义的属性使用isset()函数时被调用, __unset是在对未定义的数以使用unset时被调用

希望本文所述对大家的PHP程序设计有所帮助。

PHP拦截器的实现

就是几个$_SERVER的变量
$url = 'http://'.$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];
echo $url;
这两个就是你想要的东东..
 

php中用了拦截器与属性公共有什不同

拦截器有拦截器不可替代的功能,拦截器可以集体处理及存储变量,而公共属性并不好,你如果常用公共属性,你的面向对象思维都没了.老大.
 

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