WP_Media_List_Table::get_columns()

	public function get_columns() {
		$posts_columns = array();
		$posts_columns['cb'] = '<input type="checkbox" />';
		/* translators: column name */
		$posts_columns['title'] = _x( 'File', 'column name' );
		$posts_columns['author'] = __( 'Author' );

		$taxonomies = get_taxonomies_for_attachments( 'objects' );
		$taxonomies = wp_filter_object_list( $taxonomies, array( 'show_admin_column' => true ), 'and', 'name' );

		/**
		 * Filters the taxonomy columns for attachments in the Media list table.
		 *
		 * @since WP-3.5.0
		 *
		 * @param array  $taxonomies An array of registered taxonomies to show for attachments.
		 * @param string $post_type  The post type. Default 'attachment'.
		 */
		$taxonomies = apply_filters( 'manage_taxonomies_for_attachment_columns', $taxonomies, 'attachment' );
		$taxonomies = array_filter( $taxonomies, 'taxonomy_exists' );

		foreach ( $taxonomies as $taxonomy ) {
			if ( 'category' === $taxonomy ) {
				$column_key = 'categories';
			} elseif ( 'post_tag' === $taxonomy ) {
				$column_key = 'tags';
			} else {
				$column_key = 'taxonomy-' . $taxonomy;
			}
			$posts_columns[ $column_key ] = get_taxonomy( $taxonomy )->labels->name;
		}

		/* translators: column name */
		if ( !$this->detached ) {
			$posts_columns['parent'] = _x( 'Uploaded to', 'column name' );
			if ( post_type_supports( 'attachment', 'comments' ) )
				$posts_columns['comments'] = '<span class="vers comment-grey-bubble" title="' . esc_attr__( 'Comments' ) . '"><span class="screen-reader-text">' . __( 'Comments' ) . '</span></span>';
		}
		/* translators: column name */
		$posts_columns['date'] = _x( 'Date', 'column name' );
		/**
		 * Filters the Media list table columns.
		 *
		 * @since WP-2.5.0
		 *
		 * @param array $posts_columns An array of columns displayed in the Media list table.
		 * @param bool  $detached      Whether the list table contains media not attached
		 *                             to any posts. Default true.
		 */
		return apply_filters( 'manage_media_columns', $posts_columns, $this->detached );
	}