我只想添加自定义帖子、缩略图和自定义字段<这是我的代码，我正在尝试添加帖子、缩略图和一个自定义字段。但我不知道如何上传这篇特定帖子的缩略图。以及如何检索此帖子。

$image_url = $_FILES[\'post_img\'][\'name\'];
$tags = $_POST[\'post_tags\'];
$my_post = array(
  //\'post_mime_type\' => $wp_filetype[\'type\'],
  \'post_title\'    => wp_strip_all_tags( $_POST[\'post_title\'] ),
  \'post_content\'  => $_POST[\'post_content\'],
  \'post_status\'   => \'publish\',
  \'post_type\'     => \'Custamize_post\',
  \'tags_input\'    => array(\'thread_tag\' => $tags),
  \'post_author\'   => $user_ID
);
$post_link = $_POST[\'post_link\'];


add_post_meta($post_id, \'post_link\', $post_link, true); 

我在一些文章中看到他们使用此代码上载文件。

$upload_dir = wp_upload_dir();
//$image_data = file_get_contents($image_url);
$filename = basename($image_url);
if(wp_mkdir_p($upload_dir[\'path\']))
    $file = $upload_dir[\'path\'] . \'/\' . $filename;
else
    $file = $upload_dir[\'basedir\'] . \'/\' . $filename;
file_put_contents($file, $image_url);

$wp_filetype = wp_check_filetype($filename, null );
$attachment = array(
    \'post_mime_type\' => $wp_filetype[\'type\'],
    \'post_title\' => \'Custamize_post\',
    \'post_content\' => \'\',
    \'post_status\' => \'inherit\'
);
$attach_id = wp_insert_attachment( $attachment, $file, $post_id );
require_once(ABSPATH . \'wp-admin/includes/image.php\');
$attach_data = wp_generate_attachment_metadata( $attach_id, $file );
wp_update_attachment_metadata( $attach_id, $attach_data );

set_post_thumbnail( $post_id, $attach_id );

但我这里主要关心的是如何将上面创建的帖子连接到这个附件。

$my_post = array(
    \'ID\' => $attach_id,
    \'post_parent\' => $my_post_id //retrieved after you inserted your post
);

wp_update_post( $my_post );