Change Number of Search Results per Page

If you want to change the number of search results per page, you can use the following snippet:

add_action( 'pre_get_posts',  'wpkb_change_number_of_search_results_per_page'  );

function wpkb_change_number_of_search_results_per_page( $query ) {
    if ( is_search() && $query->is_main_query() ) {
        $query->set( 'posts_per_page', 100);
    }

    return $query;
}

If you want to avoid problems in the backend, add !is_admin() && to the if condition.

Important notice: You have to add this snippet to the functions.php file of your theme. If you add it so a special template file like search.php, it is ‘too late’ and the default limit is already applied.