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I understand that the following filter modifies the parameters of the authentication cookies, in fact I have managed to modify its value since it is the first parameter $cookie, but what I need is to modify the parameter $expiration that translates to Expires in the cookie.

So how could I modify the third parameter $expiration given that only $cookie can be returned and the rest seem to be in context?

add_filter( "auth_cookie", "modify_auth_cookie_defaults", 10, 5 );
function modify_auth_cookie_defaults($cookie, $user_id, $expiration, $scheme, $token) { 

return str_replace( $expiration, DAY_IN_SECONDS, $expiration );
}

add_filter( "auth_cookie", "modify_auth_cookie_defaults", 10, 5 );
function modify_auth_cookie_defaults($cookie, $user_id, $expiration, $scheme, $token) { 
$expiration = YEAR_IN_SECONDS
return $expiration; 
}


1 Answer 1

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You can't modify the parameters of a filter like that, that's not what they're there for. In the source code it'll look something like this:

$cookie = apply_filters( $cookie, $user_id, $expiration, $scheme, $token ); 

It's explicitly looking for the value of $cookie. If you return the value for $expiration, things will break. The extra parameters are there so filtering can be restricted to specific situations, like only for a certain user.

However you can modify the expiration with a different approach. The function that contains the auth_cookie filter is wp_generate_auth_cookie(). This function appears to only be used (in core at least) by the function wp_set_auth_cookie(). If we look at that function, we can see the auth_cookie_expiration filter. This filter is what creates the $expiration value that is passed to the original auth_cookie filter.

TL;DR, use the auth_cookie_expiration filter instead.

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