Change the default 10-day expiration for the password protected pages cookie

Question

I'm trying to change the default 10-day expiration for the cookie that allows a user to repeatedly view the content on a password-protected WP page without having to re-enter the page password during the default 10-day period. Rather than 10 days, I'd like to re-set the expiration to 30 seconds.

The WP code reference is here:

apply_filters( 'post_password_expires', int $expires )

This is what I have tried, without success:

function custom_post_password_expires() {
    return time() + 30; // Expire in 30 seconds
}
apply_filters('post_password_expires', 'custom_post_password_expires');

I've read the answers to previous similar questions, and none seem to apply or to provide a solution that works with the current version of WP. I suspect that the correct answer is very simple, but so far I'm not finding it. (Note: I am not an advanced developer, so I'd appreciate replies that are easy to understand :)

Thanks.

Answer 1

You should be using add_filter( ... ), not apply_filters( ... ):

/**
 * Filters the life span of the post password cookie.
 *
 * By default, the cookie expires 10 days from creation. To turn this
 * into a session cookie, return 0.
 *
 * @since 3.7.0
 *
 * @param int $expires The expiry time, as passed to setcookie().
 */
add_filter( 'post_password_expires', 'wpse_custom_post_password_expires' );
function wpse_custom_post_password_expires( $expires ) {
    return time() + 30; // Expire in 30 seconds
}

Answer 2

I'm running Wordpress 5.7 now and indeed we live in the year 2021.

I'v got the same problem as Zocios.

A page is secured with a Password which you need to enter to view the page.

When you get out of that page and return again to that page, you can enter that page without having to enter the PW.

I added to coding to the functions.php page ( I hope as you can see in the picture here below)

And perhaps you can explain to me (I know a little of coding) how I can secure the page that when i return to the secured page I need to enter the PW each time I enter that page?

thanks for your help.