php中cookie的使用方法_PHP
1.创建/更新cookie
复制代码 代码如下:
setCookie($cookieName,$value,time()+秒数);
例子:创建一个cookie,名字为UserName,值为zs,过期时间为2个星期
复制代码 代码如下:
setcookie("UserName","zs",time()+2*7*24*3600);
如果不设置时间,就不会保存到cookie文件中。浏览器不关时,能够访问。当浏览器关闭时,就无法访问了。
例子:
复制代码 代码如下:
setcookie("Age","18");
2.取cookie的值
复制代码 代码如下:
$_cookie[$cookieName];
例子:取出UserName的值,放在变量$uName中
复制代码 代码如下:
$uName=$_COOKIE['UserName'];
取值的时候,一般会先判断是否为空,再进行取值操作。上面的取值操作一般这样写:
复制代码 代码如下:
if (!empty($_COOKIE['UserName']))
{
$uName=$_COOKIE['UserName'];
}
3.删除指定cookie
复制代码 代码如下:
setcookie($cookieName,value,time()-秒数);
//或者
setcookie($cookiename, '');
//或者
setcookie($cookiename, NULL);
例子:删除UserName
复制代码 代码如下:
setcookie("UserName","zs",time()-3600);
4.删除当前会话的所有cookie
复制代码 代码如下:
foreach($_COOKIE as $key=>$val){
setcookie($key,"",time()-100);
}
当无cookie时,本机保存cookie的文件也将删除。

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