我已经安装了这个插件(http://wordpress.org/plugins/media-categories-2/) 对我的图像进行分类。

在我的功能中。php我编写了以下代码来限制库中显示的图像数量：

function get_random_gallery_images(){
    global $wpdb,$post;
        $ids = "";
        $counter = 0;
        $number_of_posts = 1;
        $args = array(
        \'post_type\' => \'attachment\',
        \'numberposts\' => 1,
        \'post_status\' => null,
        \'orderby\' => \'rand\',
        \'post_parent\' => $post->ID
        );
        $attachments = get_posts($args);
        if ($attachments) {
            foreach ($attachments as $attachment) {

                if ($counter != 0) {
                    $ids .= \',\'.$attachment->ID;
                }
                else {
                    $ids .= $attachment->ID;
                }
                $counter++;
            }
        }
        return $ids;
} 

在我的单曲里。php我输入了以下代码：

$attachment_ids = get_random_gallery_images();
$category_current = get_the_category($post->ID) ; //for getting the images of that specific category
echo do_shortcode(\'[gallery columns="1" category="\'.$category_current[0]->name.\'" include="\'.$attachment_ids.\'" link="file"]\');

问题是，如果我更改numberposts的值，这并不重要。它始终显示所有图像。我做错了什么？我只想显示1个图像。

function get_random_gallery_images(){
    global $wpdb, $post;

    $args = array(
    \'post_type\' => \'attachment\',
    \'posts_per_page\' => 1,
    \'post_status\' => \'any\',
    \'orderby\' => \'rand\',
    \'post_parent\' => $post->ID
    );

    $attachments = get_posts( $args );

    if ($attachments) {
        foreach ( $attachments as $attachment ) {
            $ids = $attachment->ID;
        }
    }

    return $ids;
}