This is a custom version of WP_Query_Multisite, by ericandrewlewis, to support multisite post queries but without changing the class declaration, we will use the good ol' WP_Query. Just by entering the custom query var multisite => 1 on your query args and your query is now global.
$query = new WP_Query( array('multisite' => '1' ) );
while($query->have_posts()) : $query->the_post();
echo $blog_id . get_the_title() . "<BR>";
endwhile;
wp_reset_postdata();To modify what sites are queried, create a 'sites' element in the $args in the constructor parameter, with a sub-element of either 'sites__in' or 'sites__not_in', which will be an array similar to 'posts__in' in the WP_Query object.
$args = array(
'multisite' => 1,
'sites__in' => array( 1, 2, 3, 5)
);
$query = new WP_Query( $args );
while($query->have_posts()) : $query->the_post();
echo $blog_id . get_the_title() . "<BR>";
endwhile;
wp_reset_postdata();On your functions.php:
include_once(TEMPLATEPATH . '/path/to/multisite-query.php');
function my_multisite_search($query) {
if(!is_admin() && $query->is_main_query() && $query->is_search) {
$query->set('multisite', 1);
}
}
add_action('pre_get_posts', 'my_multisite_search');