Video Tutorial The pre_get_posts action

In this chapter we will talk about the hook pre_get_posts. This hook allows to alter a request before its execution and will in particular allow to alter the main WordPress request to add specific filters.

/ **
 * @param WP_Query $ query
 * /
function montheme_pre_get_posts ($ query) {
    if (is_admin () ||! is_search () ||! $ query-> is_main_query ()) {
        return;
    }
    if (get_query_var ('sponso') === '1') {
        $ meta_query = $ query-> get ('meta_query', ());
        $ meta_query () = (
            'key' => SponsoMetaBox :: META_KEY,
            'compare' => 'EXISTS',
        );
        $ query-> set ('meta_query', $ meta_query);
    }
}
add_action ('pre_get_posts', 'montheme_pre_get_posts');

You can also use the filter query_vars to allow WordPress to manage new keywords at the URL level.

function montheme_query_vars ($ params) {
    $ params () = 'sponso';
    return $ params;
}
add_filter ('query_vars', 'montheme_query_vars');