filter get_children to return all mime types EXCEPT 'x'

Question

Like it says on the tin - Im trying to create a list of post attachments that includes everything except say audio, which I'll feed into a player instead.

• The filter needs to be generic: 'audio' not 'audio/mpeg'.

(For some reason if ( $mime !== 'audio/mpeg' ) will filter out valid mp3 files –– weird.)

So the following dosen't work:

$children = get_children( array('post_parent' => $post->ID, 'post_status' => 'inherit', 'post_type' => 'attachment' ) );

            if ( !empty( $children )){
                foreach ( $children as $attachment_id => $attachment ) {
                    $mime = get_post_mime_type($attachment);
                    $url = wp_get_attachment_url( $attachment->ID, false );  
                        if ( $mime !== 'audio/mpeg' ) {                                                             
                                $content_attach .= '<a href="' . $url . '"  download="' . $url . '"> ' . $title . ' | ' . $mime . '</a>';
                        }
                }       
             }  
echo apply_filters('the_content', $content_attach ); 

Further listing every audio mime type like so: if($mime !== 'audio/mpeg' || $mime !== 'audio/ogg') etc will still leave out those crazy mp3 files.

What does work is:

$children = get_children( array('post_parent' => $post->ID, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'audio' ) );

which will return all the attached audio types in one go - great my player can handel it.

Now I need to omit everything that isn't audio and list it.

Does anyone have any ideas?

and thanks again for your help and experience. . .

Answer 1

Looks like this is two questions: how to get all the children that are audio, and how to get all the children that aren't audio.

1) The post_mime_type parameter of get_children can actually take a wildcard, so you could use:

$children = get_children(array(
     'post_parent' => $post->ID,
     'post_status' => 'inherit',
     'post_type' => 'attachment',
     'post_mime_type => 'audio/%'
));

2) You can't do a mime-type exclusion using get_children, so you're better off just filtering the whole list to exclude them that way. I think you've got the right idea, just use something like this to exclude all the different kinds of audio:

if ( ! strstr($mime, 'audio/') ) {  // ...etc