我已经创建了一个导入文件，从非wordpress数据库获取文章，并将其作为wordpress中的帖子引入，我不知道如何将缩略图图像引入我定义为“缩略图”的自定义字段。任何建议。

以下是我使用的代码：

    $results = mysql_query("SELECT headline, abstract, article, author, posted,    category, img, facilities FROM articles",$lclink);

    $i = 0;
while ($row = mysql_fetch_array($results,MYSQL_ASSOC)) {
   $post = array();
   $post[\'post_status\'] = \'publish\';
   $post[\'post_category\'] = array(1);
   $post[\'post_date\'] = date(\'Y-m-d H:i:s\',strtotime($row[\'posted\']));
   $post[\'post_title\'] = $row[\'headline\'];
   $post[\'post_excerpt\'] = $row[\'abstract\'];
   $post[\'post_content\'] = $row[\'article\'];
   $post[\'post_author\'] = $row[\'author\'];



   $posts[$i] = $post;
   $i++;
}

require(\'./wp-load.php\');

foreach ($posts as $post) {
  wp_insert_post($post);
}