We can simplify the mime type checks, with the following boolean functions:
-
wp_attachment_is( 'image', $id ) -
wp_attachment_is( 'video', $id ) -
wp_attachment_is( 'audio', $id )
where $id is the attachment ID.
The attachment’s ID is actually one of the input arguments for the media_send_to_editor filter callback.
We also have:
wp_attachment_is_image( $id )
that’s a wrapper for wp_attachment_is( 'image', $id ).
References:
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