Question

为什么这段代码只是循环相同的图像？我想在<li> html标签中显示不同的图像，但它只是重复图像。

$querystr = "
                SELECT wposts.ID, wposts.post_title
                FROM $wpdb->posts wposts
                WHERE wposts.post_type = 'attachment'
                AND wposts.post_mime_type = 'image/jpeg'
                ORDER BY RAND() LIMIT 10
            ";

            $id = $wpdb->get_results($querystr, ARRAY_A);
            ) );

if(is_array($id) || is_object($id)){
                        //  var_dump($id);
                        //  echo "Total Photos: " . count($id);
                            foreach($id as $data){

                                $photo= wp_get_attachment_url( get_post_thumbnail_id( $data->ID));
                                $title = wp_get_attachment_image($data->post_title);


                            echo '<li><img src="'.$photo.'" alt="'.$title.'"/></li>';
                                //var_dump($photo);
                            }
                        }

Answer 1

$id后面有语法错误，括号) );将其删除
使用ARRAY_A返回数组结果集，使用错误的对象。
如果您有附件ID，请使用wp_get_attachment_url它将返回图片网址。但如果您同时使用wp_get_attachment_url和get_post_thumbnail_id，则只返回使用页面中的Featured Image附加帖子的图片或发布部分。
当数据以数组形式检索数据时

使用 $array['column_name'] 或者

如果它在对象 USE：$object->column_name

所以正确的代码是。

    $querystr = "
                SELECT wposts.ID, wposts.post_title
                FROM $wpdb->posts wposts
                ORDER BY RAND() LIMIT 10
            ";

$img_array = $wpdb->get_results($querystr, ARRAY_A);
// For Array 
if (is_array($img_array)) {

    foreach ($img_array as $data) {

        $photo = wp_get_attachment_url(get_post_thumbnail_id($data['ID']));
        $title = ($data['post_title']);


        echo '<li><img src="' . $photo . '" alt="' . $title . '"/>' . $title . '</li>';

    }
}


// For Object 
$img_object = $wpdb->get_results($querystr);

if (is_object($img_object)) {

    foreach ($img_array as $data) {

        $photo = wp_get_attachment_url(get_post_thumbnail_id($data->ID));
        $title = ($data->post_title);


        echo '<li><img src="' . $photo . '" alt="' . $title . '"/>' . $title . '</li>';

    }
}

Answer 2

要从帖子中选择图片，您应该选择已发布的帖子。将查询更改为

$querystr = "
                SELECT wposts.ID, wposts.post_title
                FROM $wpdb->posts wposts
                WHERE wposts.post_type = 'attachment'
                AND wposts.post_mime_type = 'image/jpeg'
                AND wposts.post_status = 'publish'
                ORDER BY RAND() LIMIT 10
            ";

wp_get_attachment_url重复图像

2 个答案: