Function Reference/wp insert attachment

$image_id = wp_insert_attachment( $attachment, $filename, $parent_post_id );

update_post_meta($post_id, "_thumbnail_id", $image_id);

谢谢你的回答。这很对劲。我现在使用以下代码：

//SAVE THE POST - $new_post is my array that conforms to the necessary requirements
$pid = wp_insert_post($new_post);

//SET MY TAGS UP PROPERLY - $tagsArray contains an array of tags
wp_set_post_tags($pid, $tagsArray);

//ADD IMAGE TO IMAGE-GALLERY AND return $image_id - $wp_image is my image filename
$wp_filetype = wp_check_filetype(basename($wp_image), null);
$attachment = array(
   \'post_mime_type\' => $wp_filetype[\'type\'],
   \'post_title\'     => preg_replace(\'/\\.[^.]+$/\', \'\', $myImageTitle),
   \'post_content\'   => \'\',
   \'post_status\'    => \'inherit\'
);
$serverFullPath = \'/home/user/public_html/mysite/wp-content/uploads/\';
$image_id = wp_insert_attachment($attachment, $serverFullPath . $wp_image, $pid);

//ADD THE MEDIA GALLERY IMAGE AS A FEATURED IMAGE FOR THIS POST
update_post_meta($pid, "_thumbnail_id", $image_id);

//POST THE POST
do_action(\'wp_insert_post\', \'wp_insert_post\');

谢谢你的帮助。