get_previous_post 使用get_adjacent_post() 它有一系列可以使用的过滤器挂钩，但更简单的方法是创建自己的函数，如下所示：

// Create a new filtering function that will add our where clause to the query
function date_filter_where( $where = \'\' ) {
    global $post;
    $where .= " AND post_date >= \'".$post->post_date."\'";
    return $where;
}

//then create your own get previous post function which will take an array of categories eg: 
// $cats = array(\'1\',\'2\');
function my_get_previous_post($cats){
    global $post;
    $temp = $post;
    $args = array(
        \'posts_per_page\' => 1,
        \'post_type\' => \'post\',
        \'post_status\' => \'publish\',
        \'category__and\' => $cats
    );
    add_filter( \'posts_where\',\'date_filter_where\' );
    $q = new WP_Query($args);
    remove_filter( \'posts_where\',\'date_filter_where\' );
    while ($q->have_posts()){
        $q->the_post;
        echo \'<a href="\'.get_permalink($post->ID).\'">\'.get_the_title($post->ID).\'</a>\';
    }
    $post = $temp;
    wp_reset_query();
}