$paged = (get_query_var('paged')) ? get_query_var('paged') : 1;
$post_per_page = get_option('posts_per_page');
$args = array(
'post_type' => 'teacher',
'paged' => $paged,
'posts_per_page'=> 8,
);
$wp_query = new WP_Query($args);
?>