如何使用 php 和 javascript 从不同的域获取 cookie
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how to get cookies from a different domain with php and javascript
提问by manashb
Suppose i have a cookie set in first.com say user. Now i want to read that cookie in second.com through javascript and ajax. But it is not working.I have got xmlHttp.status=0.
假设我在 first.com 中设置了一个 cookie 说用户。现在我想通过javascript和ajax读取second.com中的cookie。但它不起作用。我有 xmlHttp.status=0。
sample code
示例代码
in the second domain readcookie.php file
在第二个域 readcookie.php 文件中
var xmlHttp;
function createXMLHttpRequest(){
if(window.ActiveXObject)
xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
if(window.XMLHttpRequest)
xmlHttp=new XMLHttpRequest();
}
function readcookie(){
createXMLHttpRequest();
xmlHttp.open("GET","http://www.first.com/cookie.php",true);
xmlHttp.onreadystatechange=getcookie;
xmlHttp.send(null);
}
function getcookie(){
if(xmlHttp.readyState==4){
if(xmlHttp.status==200){
var reply=xmlHttp.responseText;
if(reply){
alert(reply);
}
}
else
alert(xmlHttp.status);
}
}
in the first domain cookie.php file
在第一个域 cookie.php 文件中
if(isset($_COOKIE['user'])){
echo $_COOKIE['user'];
}
else{
setcookie('user','a2345',0);
echo $_COOKIE['user'];
}
回答by Reinstate Monica Cellio
You can't read cookies from another domain - end of.
您无法从另一个域读取 cookie - 结束。
The only way I can think of is to add some code to the 2nd domain that gets the cookies for you and then to place this in a page on the 1st domain, in an iframe.
我能想到的唯一方法是将一些代码添加到为您获取 cookie 的第二个域中，然后将其放置在 iframe 中的第一个域上的页面中。
You obviously need full access to both domains to be able to do this kind of thing.
您显然需要对两个域的完全访问权限才能执行此类操作。
回答by Semir
Your problem is that browsers wont let javascript to access different domain. Add:
您的问题是浏览器不会让 javascript 访问不同的域。添加：
header('Content-type: text/html');
header('Access-Control-Allow-Origin: *');
lines to the beginning of cookie.php and it'll work. Still, you wont get the cookie (or at least in Chrome). I couldnt yet figure out why. It seems as if chrome creates a new session for the javascript and wont let that session access previous cookies. Like HttpOnly.
行到 cookie.php 的开头，它会起作用。不过，你不会得到 cookie（或至少在 Chrome 中）。我还想不通为什么。似乎 chrome 为 javascript 创建了一个新会话，并且不会让该会话访问以前的 cookie。像 HttpOnly。
