Problem with wordpress pagination

Question

First of all thank you everyone for all the knowledge base i got reading trough stackexchange. For the first time i couldn't find an answer to my problem.

The matter is that with this custom query (which has the purpose to search trough the posts with multiple taxonomy fields):

global $wp_query;
$tax_query = array();
$parametri = array(
                        'ih_tipo_struttura' =>  array('tipo_struttura','IN'),
                        'ih_localita'       =>  array('localita', 'IN'),
                        'ih_stelle'         =>  array('stelle', 'IN'),
                        'ih_categorie'      =>  array('categorie', 'AND'),
                        'ih_servizi'        =>  array('servizi', 'AND')
                    );
// Faccio il post dei parametri e li inserisco nella query
foreach ($parametri as $post => $taxonomy) {
    if ( isset($_GET[$post]) && !empty($_GET[$post]) ){ 
        $tax_query[] = array(
                    'taxonomy'  => $taxonomy[0],
                    'field'     => 'slug',
                    'terms'     => $_GET[$post],
                    'operator'  => $taxonomy[1]
                    ); 
    }
}
// Parametri base della query
$args = array( 
    'post_type' => 'post',
    'tax_query' => $tax_query
);
// Parametri paginazione
if ( $pagination ) {
    $paged = (get_query_var('paged')) ? get_query_var('paged') : 1;
    $args['posts_per_page'] = 2;
    $args['paged'] = $paged;
} else {
    $args[] = array( 'posts_per_page' => 20);   // Se imposto la paginazione a false ritorno i primo 20 risultati
}
// Eseguo la query
$wp_query = new WP_Query( $args );
return $wp_query;

everything works fine until i try to do some pagination.

When i pass trough the url some $_GET parameters like:

http://mywebsite/ricerca/?ih_localita%5B%5D=riccione&ih_localita%5B%5D=rimini&ricerca_hotel=true

or

http://mywebsite/ricerca/page/2/?ih_localita=riccione&ih_localita%5B%5D=rimini&ricerca_hotel=true

there's no problem but if try:

http://mywebsite/ricerca/page/2/?ih_localita%5B0%5D=riccione&ih_localita%5B1%5D=rimini&ricerca_hotel=true

wordpress cut off all the search parameters returning the url just like:

http://mywebsite/ricerca/page/2/?ricerca_hotel=true

I'm getting crazy with this so i would really appreciate any help.

Thx

Answer 1

Don't stomp on the $wp_query global. Use your own variable to hold your query instead:

$custom_query = new WP_Query( $args );

Then, you can use a little trick to fix pagination. Do this before the loop:

global $wp_query;
// Store it for safekeeping
$temp_wp_query = $wp_query;
// Now blank it out
$wp_query = null;
// Now populate it with your custom query
$wp_query = $custom_query;

Then, after the loop closes, restore the original query object:

$wp_query = $temp_wp_query;

Now, your pagination should work properly.

Answer 2

At a second glance i figure out that the problem is probably with url rewrite on pagination which doesn't work well with this url format:

page/2/?ih_localita%5B0%5D=riccione&ih_localita%5B1%5D=rimini

cutting off all the multiple checkbox parameter and rewriting it as:

page/2/

Now my solution will probably be to use another format to pass checkbox multiple value so i will do something like

page/2/?ih_localita=rimini,riccione

that actually works fine but it would be nice to figure out where the problem is...