How to Implement the SameSite Attribute for PHP Cookies?

Same Site Attribute for PHP Cookies

RFC 6265 introduces the "Same Site" attribute for cookies, which enhances cookie security by restricting cross-site request forgery (CSRF) attacks.

PHP Support:

For PHP >= v7.3:

The setcookie() function supports the "Same Site" attribute via the $options array. The valid values are:

• None
• Lax
• Strict

For PHP < v7.3:

Due to PHP core limitations, several workarounds are available:

Apache Configuration:

Add the following line to modify all cookies with the "Same Site" attribute:

Nginx Configuration:

Update the configuration to include:

Header Method:

You can explicitly set cookies using headers:

Exploiting a Bug:

Using an outdated setcookie() method leveraging a bug:

Note: This bug is resolved in PHP 7.3.

References:

• [Chrome Status: Feature documentation](https://www.chromestatus.com/feature/5633521622188032)
• [HTTPbis draft](https://tools.ietf.org/html/draft-west-first-party-cookies)
• [HTTPbis latest draft](https://datatracker.ietf.org/doc/html/draft-ietf-httpbis-rfc6265bis)
• [PHP Manual: setcookie()](https://php.net/manual/en/function.setcookie.php)

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