在WordPress中获取媒体中所有文件的元数据

Question

I need to retrieve metadata of files that are not images such as word, excel or pdf documents. I was able to retrieve the metadata when it was attached to a page or post but when its not attached, not getting anything.

I tried using get_post_meta( $post_id ); and wp_get_attachment_metadata( $attachment_id );

I'm only getting the following information when using get_post_meta( $post_id );:

Array
(
    [_wp_attached_file] => Array
        (
            [0] => 2015/03/test.xlsx
        )

    [_edit_lock] => Array
        (
            [0] => 1425404399:741
        )
)

Nothing for wp_get_attachment_metadata( $attachment_id );.

Answer 1

You can get all the attachments (regardless of whether the are attached to a post or page) with:

$attachments = get_posts( array('post_type' => 'attachment) );

Make an array of the mime types you do not want:

$exclude = array(
    'image/jpeg',
    ...
);

Then you can go through them looking at the mime type:

foreach ($attachments as $attach) {
    if (!in_array($attach->post_mime_type, $exclude) {
    // Do what you want to do with it
    }
}