WordPress function for redirecting users based on custom user meta

wp-login-redirect.php

<?php

/**
 * WordPress function for redirecting users based on custom user meta
 */
function my_login_redirect( $url, $request, $user ){
    if( $user && is_object( $user ) && is_a( $user, 'WP_User' ) ) {
        if( 'cool' == get_user_meta( $user->ID, '_is_cool', true ) ) {
            $url = home_url('/cool-people-only/');
        }
    }
    return $url;
}

add_filter('login_redirect', 'my_login_redirect', 10, 3 );