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I want to create a cookie from one domain once the user is registered in PHP. and make this cookie accessible to 4 other domains not subdomain. I know that cookies are not designed to be accessible for other domains. For example I have set a cookies variable $user_email from domain http://www.firstdomain.com and want to access it in other domains like http://www.seconddomain.com, http://www.thirddomain.com etc. May be this can be done using PHP or JavaScript. Any idea please.
Thank you!
As you have already said, a cookie can only be set for a domain from that domain (including its subdomains). And if your domains do not share a common superdomain, you need set each cookie for each domain separately.
You can do this with a script that on each domain that sets the cookie for you. But make sure to authenticate requests to these scripts so that only you can set the cookies.