Redirect if string found in URL

Question

I'm trying to redirect non-logged in users to the login page when viewing any pages relating to a plugin.

My code is working fine when I specify which pages they can't view, but I'm trying to pull in a string from the URL which is where I'm struggling.

Here is an example URL: http://domain.com/idx/city/irvine/

I am trying to detect the string 'idx' in the URL. I looked at the rewrite rules defined in the IDX plugin I'm using:

"idx/city/([^/]+)(?:/page\-(\\d+))?"       => 'index.php?idx-action=results&idx-q-Cities=$matches[1]&idx-d-ResultPage=$matches[2]'

I've tried checking if $_GET['idx-action'] is set but that didn't work.

// Check for registered user or redirect to login/register page
add_action('template_redirect','tc_check_if_logged_in');
function tc_check_if_logged_in() {
// If user is not logged in, check for restricted pages (inside array) and ignore home/front page and admin pages
//if (!is_user_logged_in() && (is_page( array('1306','999999','999998',)) && !is_home() && !is_front_page() && !is_admin())) // commented out as I know this part works

if ($_GET['idx-action']) // Check if IDX query set 
{
    // If restricted, redirect to login page then redirect back to original page
    $url = add_query_arg(
        'redirect_to',
        get_permalink(),
        site_url('wp-login.php')
    );
    wp_redirect($url);
    exit;
}   
} 

Sorry if question is unclear. Got a really bad head cold and can't think!

Answer 1

Nothing in $_GET will be set for internal rewrite rules, that's not how they work. Look in the query vars for idx-action- either get_query_var('idx-action') or $wp_query->query_vars['idx-action'].