manage_media_columns filter-hook . WP 2.5.0

Filters the Media list table columns.

Usage

add_filter( 'manage_media_columns', 'filter_function_name_4096', 10, 2 );
function filter_function_name_4096( $posts_columns, $detached ){
	// filter...

	return $posts_columns;
}

$posts_columns(array)

An array of columns displayed in the Media list table.

$detached(true/false)

Whether the list table contains media not attached to any posts.
Default: true

Where the hook is called

return apply_filters( 'manage_media_columns', $posts_columns, $this->detached );

Where the hook is used (in WP core)