php中cookie实现二级域名可访问操作的方法
这篇文章主要介绍了php中cookie实现二级域名可访问操作的方法,对比了常用的setcookie函数用法,并给出了一个设置cookie的类文件来实现这一功能,是非常实用的技巧,
本文实例讲述了php中cookie实现二级域名可访问操作的方法。分享给大家供大家参考。具体方法如下:
cookie在一些应用中很常用,假设我有一个多级域名要求可以同时访问主域名绑定的cookie,下面就来给大家具体介绍在php中利用setcookie实现二级域名可以成功访问主域名cookie值的方法.
有时候两个域名可能在不同的服务器上,但是我们依然希望二级域名能够顺利访问主域名的cookie,主域名可以顺利访问二级域名的cookie,比如sc.jb51.net 希望能访问 和 blog.jb51.net 的 cookie
下面介绍3种你可能常听到的全局cookie设置方式.
第一种实例代码如下:
复制代码 代码如下:
setcookie("jb51",$s,time()+3600*12,'/','*.jb51.net');
*号无法成功设置一个cookie
第二种实例代码如下:
复制代码 代码如下:
setcookie("jb51",$s,time()+3600*12,'/','.jb51.net');
成功设置一个全局cookie,这样在ss.jb51.net下也能正确读取
第三种实例代码如下:
复制代码 代码如下:
setcookie("jb51",$s,time()+3600*12,'/','jb51.net');
成功设置一个全局cookie,在ss.jb51.net下也能正确读取
这种方式的理解是仅仅jb51.net能够读取,在FireFox下测试成功,IE下测试成功,代码如下:
复制代码 代码如下:
setcookie("jb51",$s,time()+3600*12,'/','ss.jb51.net');
设置一个仅仅在ss.jb51.net域名下可以正确读取的cookie,网络上标准的说法为.jb51.net这样,也有*的说法(该说法完全错误).下面推荐一个不错的php cookie操作的类,,可以设置cookie、获取cookie、删除cookie,代码如下:
复制代码 代码如下:
/**
* php cookie类
* class:PHP_COOKIE
*/
class PHP_COOKIE
{
var $_name = "";
var $_val = array();
var $_expires;
var $_dir = '/';// all dirs
var $_site = '';
function PHP_COOKIE($cname, $cexpires="", $cdir="/", $csite="")
{
$this->_name=$cname;
if($cexpires){
$this->_expires=$cexpires;
}
else{
$this->_expires=time() + 60*60*24*30*12; // ~12 months
}
$this->_dir=$cdir;
$this->_site=$csite;
$this->_val=array();
$this->extract();
}
function extract($cname="")
{
if(!isset($_COOKIE)){
global $_COOKIE;
$_COOKIE=$GLOBALS["HTTP_COOKIE_VARS"];
}
if(emptyempty($cname) && isset($this)){
$cname=$this->_name;
}
if(!emptyempty($_COOKIE[$cname])){
if(get_magic_quotes_gpc()){
$_COOKIE[$cname]=stripslashes($_COOKIE[$cname]);
}
$arr=unserialize($_COOKIE[$cname]);
if($arr!==false && is_array($arr)){
foreach($arr as $var => $val){
$_COOKIE[$var]=$val;
if(isset($GLOBALS["PHP_SELF"])){
$GLOBALS[$var]=$val;
}
}
}
if(isset($this)) $this->_val=$arr;
}
// 在全局范围内移除cookie
unset($_COOKIE[$cname]);
unset($GLOBALS[$cname]);
}
function put($var, $value)
{
$_COOKIE[$var]=$value;
$this->_val["$var"]=$value;
if(isset($GLOBALS["PHP_SELF"])){
$GLOBALS[$var]=$value;
}
if(emptyempty($value)){
unset($this->_val[$var]);
}
}
function clear()
{
$this->_val=array();
}
function set()
{
if(emptyempty($this->_val)){
$cookie_val="";
}
else {
$cookie_val=serialize($this->_val);
}
if(strlen($cookie_val)>4*1024){
trigger_error("The cookie $this->_name exceeds the specification for the maximum cookie size. Some data may be lost", E_USER_WARNING);
}
setcookie("$this->_name", $cookie_val, $this->_expires, $this->_dir, $this->_site);
}
}
?>
希望本文所述对大家的PHP程序设计有所帮助。

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