One Cookie For multiple Domain

[sunshine33]

Hi All,

 

I want to shared between some website (community) a same cookie to allowed users to login only once.

 

It means I've to create a cookie for a main domain and each domain have to read it.

 

I found this code, it allow, in theorie, to create a cookie for another domain of the current domain .. but it doesn't work well :

 

 
header("P3P: policyref=\"http://www.nomdomaine.com/p3p.xml\",CP=\"NON DSP COR CURa PSA PSD OUR BUS NAV STA\"");
setcookie("moncookie",$valeurducookie, time()+(3600*$nb_heures), "/", "nomdomaine.com",0);

 

p3p.xml :

 
<?xml version="1.0" encoding="UTF-8" ?>
<META xmlns="http://www.w3.org/2000/12/P3Pv1">
<POLICY-REFERENCES>
   <POLICY-REF about="/w3c/policy.xml">
     <INCLUDE>/*</INCLUDE>
     <COOKIE-INCLUDE>* * *</COOKIE-INCLUDE>      
   </POLICY-REF>
</POLICY-REFERENCES>
</META>

 

 

I know it is possible to do it. For example : http://www.xiti.com/en/home.aspx

When you visit a website with the xiti tag, it create a cookie for the xiti domain even the website isn't xiti !!!

So, it is possible to do it, but I can't find how to do it ?

 

If somebody can help me, I'll really appreciate  :wink:

 

Thanks al ot

[Psycho]

You can't "really" share a cookie across multiple domains - only sub-domains.

 

According to this page http://www.15seconds.com/issue/971108.htm (which is about ASP, but the logic is valid for PHP), making a COOKIE available across domains is more of a "trick" than a function.

 

The first domain will issue the cookie, and the second domain will request the cookie from the first. However, you need to be VERY careful here. If you don't put up proper security, then a 3rd party site could access cookies from your site. Just make sure any requests are from your domains.

[rhodesa]

I would look into OpenID: http://openid.net/