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Table of Contents
1. Set a unified session ID delivery method
2. Shared session storage backend
3. Set the domain attribute of the cookie (applicable to subdomains)
4. Cross-domain communication solution (advanced)
Home Backend Development PHP Tutorial How to use PHP sessions with a different domain or cross-domain?

How to use PHP sessions with a different domain or cross-domain?

Jul 13, 2025 am 02:46 AM
Cross domain php session

The answer is: PHP native session is only available for single domain names by default, but can be shared across domains through manual intervention. 1. Explicitly pass the session ID, pass it through URL parameters or custom headers and set session_id in the target domain name; 2. Share the session storage backend, such as using Redis, Memcached or NFS shared directories; 3. Set the domain attribute of the cookie to be suitable for subdomain sharing; 4. Use advanced solutions such as OAuth, JWT, or SSO to replace the direct sharing session to improve security and scalability. The above methods need to be combined with HTTPS and security controls to prevent risks.

How to use PHP sessions with a different domain or cross-domain?

If you are developing applications that share user status with multiple domain names, you may encounter the problem of "How to use session across domains in PHP". The answer is: PHP native session is only valid under one domain name by default. To achieve cross-domain use, several key points need to be manually intervened.

How to use PHP sessions with a different domain or cross-domain?

Here are some practical practices to help you share session data between different domain names.


1. Set a unified session ID delivery method

By default, PHP stores and passes session IDs through cookies. Cookies have domain restrictions and can only be passed to pages under the current domain name by default.

How to use PHP sessions with a different domain or cross-domain?

Solution:

  • Pass the session ID explicitly through URL parameters or custom header.
  • For example, when jumping to another domain name, take ?sid=xxx and then force the session ID to be set in the target domain name using session_id($_GET['sid']) .
 // Get the current session ID before jumping
session_start();
$sessionId = session_id();

header("Location: https://otherdomain.com/page.php?sid=" . $sessionId);
 // Receive sid in otherdomain.com and set if (isset($_GET['sid'])) {
    session_id($_GET['sid']);
}
session_start();

?? Note:

How to use PHP sessions with a different domain or cross-domain?
  • Doing so will easily expose the session ID and be sure to use it with HTTPS.
  • It is best to add validity control to avoid long-term exposure causing safety risks.

2. Shared session storage backend

If two domain names use different servers or storage paths, even if they have the same session ID, they may not be able to read the same data.

Solution:

  • Set the session storage path to a location that all domain names can access (such as the NFS shared directory).
  • Or use centralized session storage such as database, Redis, Memcached, etc.

For example, use Redis to store session:

 //Configure the following content on both servers corresponding to the two domain names ini_set('session.save_handler', 'redis');
ini_set('session.save_path', 'tcp://127.0.0.1:6379');

session_start();

In this way, no matter which domain name starts the session, data will be read and written from the same Redis instance.


If the two domain names are the relationship between the primary domain and the subdomain (such as example.com and app.example.com ), you can automatically share by setting the domain of the session cookie.

 session_set_cookie_params([
    'lifetime' => 0,
    'path' => '/',
    'domain' => '.example.com', // Note that there is a point 'secure' => true, // If it is HTTPS
    'httponly' => true,
    'samesite' => 'None'
]);

session_start();

After setting this, the browser will send the session cookie to all subdomains under .example.com .


4. Cross-domain communication solution (advanced)

If you do not want to manually process the session ID, you can also consider using OAuth, JWT, or single sign-on (SSO) mechanisms to unify the authentication status.

This type of solution does not directly share sessions, but exchanges identity information through tokens. Although it is a little more complex, it is safer and more scalable, and is suitable for large systems.

Common practices include:

  • Cross-domain authentication using OpenID Connect protocol
  • Use JWT Token instead of session to carry user identity information in the request header

Basically these are the methods. PHP itself does not natively support cross-domain sessions, but by manually controlling session ID and shared storage, state synchronization between multiple domain names can be achieved. Operation is not too difficult, but you should pay attention to security and consistency issues.

The above is the detailed content of How to use PHP sessions with a different domain or cross-domain?. For more information, please follow other related articles on the PHP Chinese website!

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