How can I set the \"SameSite\" attribute for cookies in PHP versions prior to 7.3?

How to Use PHP "SameSite=Strict"

In response to the recent changesoutlined in "RFC 6265," which introduced the "Same Site" attribute for controlling cookie access, there has been growing interest in supporting this attribute within PHP.

PHP >= v7.3

For PHP versions 7.3 and above, the ability to set the "Same Site" attribute has been incorporated through the $options array in the setcookie() function. The following example demonstrates how to set the "Same Site" value to "None":

<code class="php">setcookie($name, $value, [
    'expires' => time() + 86400,
    'path' => '/',
    'domain' => 'domain.example',
    'secure' => true,
    'httponly' => true,
    'samesite' => 'None',
]);</code>

PHP < v7.3

For versions of PHP prior to 7.3, alternative solutions can be employed:

1. Apache Configuration:

By adding the following line to your Apache configuration, you can set the "Same Site" value to "Lax" for all cookies:

Header always edit Set-Cookie (.*) "; SameSite=Lax"

2. Nginx Configuration:

A similar approach is available for Nginx, where you can use the following configuration to set "Same Site" to "Strict" for all cookies:

location / {
    # your usual config ...
    # hack, set all cookies to secure, httponly and samesite (strict or lax)
    proxy_cookie_path / "/; secure; HttpOnly; SameSite=strict";
}

3. Header Method:

As cookies are essentially headers in HTTP requests, you can set them using the header() method:

<code class="php">header("Set-Cookie: key=value; path=/; domain=example.org; HttpOnly; SameSite=Lax");</code>

4. setcookie() Bug Exploit:

There is a known bug in the setcookie() method that allows for setting the "Same Site" value to "Strict" in PHP versions prior to 7.3:

<code class="php">setcookie('cookie-name', '1', 0, '/; samesite=strict');</code>

Note: This bug has been fixed in PHP 7.3.

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