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( $p ) );
这里我们可以很清楚的看到 , 当给未定义的'name'赋值时 , 会调用"__set()”
其他的还有 __call(), __isset() , __unset();
这里最有用和最常用的的是__call() , 当调用一个为存在的方法时被调用; __isset()是在对一个为定义的属性使用isset()函数时被调用, __unset是在对未定义的数以使用unset时被调用
希望本文所述对大家的PHP程序设计有所帮助。
就是几个$_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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