Paginador de posts

u87.php

function post_prev_next() {

    echo '<div class="paginador">';
        $prev_post = get_previous_post();

            if ( !empty( $prev_post ) ) :
                echo '<div class="post-prev">
                    <a href="'; echo get_permalink( $prev_post->ID ); echo '">Anterior</a>
                </div>';
            endif;

            $next_post = get_next_post();

            if ( !empty( $next_post ) ) :
                echo '<div class="post-next">
                    <a href="'; echo get_permalink( $next_post->ID ); echo '">Siguiente</a>
                </div>';
             endif;
    echo '</div>';
}