WordPress at a glance
filter is not described

get_attached_media filter-hook . WP 3.6.0

Filters the list of media attached to the given post.

Usage

add_filter( 'get_attached_media', 'filter_function_name_2262', 10, 3 );
function filter_function_name_2262( $children, $type, $post ){
	// filter...

	return $children;
}
$children(array)
Associative array of media attached to the given post.
$type(string)
Mime type of the media desired.
$post(mixed)
Post ID or object.

Where the hook is called

get_attached_media()
get_attached_media
wp-includes/media.php 3710
return (array) apply_filters( 'get_attached_media', $children, $type, $post );

Where the hook is used (in WP core)

Does not used.