PHP的拦截器实例分析,PHP拦截器实例分析
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。
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..
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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