PHP+Apache实现二级域名之间共享cookie的方法

本文实例讲述了php+apache实现二级域名之间共享cookie的方法。分享给大家供大家参考，具体如下：

简介

login.koastal.com设置domain为koastal.com，则www.koastal.com即可访问该cookie。
也就是说二级域名（或者三级域名）之间可以通过这种方式共享cookie。
其实cookie的domain属性的用法跟path有些类似，比如我们将cookie的path设置为/，则/user目录下也可以访问该cookie。

实践

apache同一端口对应不同域名

httpd-vhosts.conf

<virtualhost 127.0.0.1:80>
  servername koastal.com
  serveralias www.koastal.com 
  documentroot d:\wamp64\vhosts\www
  <directory "d:\wamp64\vhosts\www">
    options +indexes +includes +followsymlinks +multiviews
    allowoverride all
    require local
  </directory>
</virtualhost>
<virtualhost 127.0.0.1:80>
  servername login.koastal.com
  documentroot d:\wamp64\vhosts\login
  <directory "d:\wamp64\vhosts\login">
    options +indexes +includes +followsymlinks +multiviews
    allowoverride all
    require local
  </directory>
</virtualhost>

修改本机hosts

windows

c:windows/system32/drivers/etc/hosts

linux

vim /etc/hosts

在最后添加

127.0.0.1  www.koastal.com login.koastal.com

编写php代码进行测试

d:\wamp64\vhosts\www\index.php

<?php
if(isset($_cookie['username'])){
  echo "welcome to ".$_cookie['username'];
  var_dump($_cookie);
}else{
?>
<h1><a href='http://login.koastal.com'>login</a></h1>
<?php
}

d:\wamp64\vhosts\login\index.php

<form action="#" method="post">
<p>username:<input type="text" name="username"></p>
<p>password:<input type="password" name="password"></p>
<p><input type="submit" name="submit" value="submit"></p>
</form>
<?php
if(isset($_post['submit'])){
  setcookie('username',$_post['username'],0,'/','koastal.com');
  setcookie('password',$_post['password'],0,'/','koastal.com');
  header('location:http://www.koastal.com');
}

亲测可用，全文完~