我设法使这个短代码工作，它显示了我想要的一切。我现在面临的唯一问题是如果我使用posts_per_page => 1, 它不断显示所有帖子。如何才能只显示该类别的最新帖子？我试过：posts_per_page => 1 没有“”，但什么都没有，它仍然不工作。

以下是我使用的代码：

function Arte($atts, $content = null) {
    extract(
        shortcode_atts(
            array( 
                "pagination" => \'false\',
                "query" => \'\',
                "category" => \'arte\',
                "posts_per_page"    => \'1\',
            ), 
            $atts
        )
    );



    global $wp_query,$paged,$post;

    $temp = $wp_query;
    $wp_query= null;
    $wp_query = new WP_Query();

    if ( $pagination == \'true\' ) {
        $query .= \'&paged=\'.$paged;
    }

    if (!empty($category)) {
        $query .= \'&category_name=\'.$category;
    }

    if (!empty($query)) {
        $query .= $query;
    }

    $wp_query->query($query);

    ob_start();
    ?>
    <ul class="loop">
        <?php while ( $wp_query->have_posts() ) : $wp_query->the_post(); ?>
            <li><a href="<?php the_permalink() ?>" rel="bookmark">
                    <div class="cont-overlay"><?php the_post_thumbnail(
                            \'ilRaccoglitore_single\', array(
                            \'class\' => \'img-thumb-sidebar\',
                            \'alt\'   => get_the_title(), )); ?>
                        <div class="overlay"></div>
                    </div>
                    <h5 class="title-sidebar"><?php echo the_title(); ?></h5>
                </a></li>
            <li class="excerpt-sidebar"><?php the_excerpt(); ?></li>
        <?php endwhile; ?>
    </ul>

    <?php if ($pagination == \'true\') { ?>
        <div class="navigation">
            <div class="alignleft"><?php previous_posts_link(\'« Previous\') ?></div>
            <div class="alignright"><?php next_posts_link(\'More »\') ?></div>
        </div>
    <?php } ?>

    <?php
    $wp_query = null; $wp_query = $temp;

    $content = ob_get_contents();

    ob_end_clean();

    return $content;
}

add_shortcode("arte", "Arte");