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PHP的拦截器实例分析,PHP拦截器实例分析

本文实例讲述了PHP的拦截器用法。分享给大家供大家参考。具体如下:

PHP提供了几个拦截器,用于在访问未定义的方法和属性时被调用,如下所示:

1、__get($property)
功能:访问未定义的属性是被调用

2、__set($property, $value)
功能:给未定义的属性设置值时被调用

3、__isset($property)
功能:对未定义的属性调用isset()时被调用

4、__unset($property)
功能:对未定义的属性调用unset()时被调用

5、__call($method, $arg_array)
功能:调用未定义的方法时被调用

下面将通过一个小程序来说明这些拦截器的用途:

复制代码 代码如下:

class intercept_demo{
    private $xingming = "";
    private $age = 10;
  
    // 若访问一个未定义的属性,则将调用get{$property}对应的方法
    function __get($property){
        $method = "get{$property}";
        if (method_exists($this, $method)){
            return $this->$method();
        }
    }

    // 若给一个未定义的属性设置值,则将调用set{$property}对应的方法
    function __set($property, $value){
        $method = "set{$property}";
        if (method_exists($this, $method)){
            return $this->$method($value);
        }  
    }
  
    // 若用户对未定义的属性调用isset方法,
    function __isset($property){
        $method = "isset{$property}";
        if (method_exists($this, $method)){
            return $this->$method();
        }
    }
  
    // 若用户对未定义的属性调用unset方法,
    // 则认为调用对应的unset{$property}方法
    function __unset($property){
        $method = "unset{$property}";
        if (method_exists($this, $method)){
            return $this->$method();
        }
    }
  
    function __call($method, $arg_array){
        if (substr($method,0,3)=="get"){
            $property = substr($method,3);
            $property = strtolower(substr($property,0,1)).substr($property,1);
            return $this->$property;
        }
    }
  
    function testIsset(){
        return isset($this->Name);
    }
  
    function getName(){
        return $this->xingming;
    }
  
    function setName($value){
        $this->xingming = $value;
    }
  
    function issetName(){
        return !is_null($this->xingming);
    }
  
    function unsetName(){
        $this->xingming = NULL;
    }
}

$intercept = new intercept_demo();
echo "设置属性Name为Li";
$intercept->Name = "Li";
echo "\$intercept->Name={$intercept->Name}";
echo "isset(Name)={$intercept->testIsset()}";
echo "";
echo "清空属性Name值";
unset($intercept->Name);
echo "\$intercept->Name={$intercept->Name}";
echo "";
echo "调用未定义的getAge函数";
echo "age={$intercept->getAge()}";

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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