WP_Media_List_Table::get_columns

		// Back compat for pre-4.0 view links.
		if ( ! empty( $views ) ) {
			echo '<ul class="filter-links">';
			foreach ( $views as $class => $view ) {
				echo "<li class='$class'>$view</li>";
			}
			echo '</ul>';
		}
		?>
	</div>

	<div class="search-form">
		<label for="media-search-input" class="media-search-input-label"><?php esc_html_e( 'Search' ); ?></label>
		<input type="search" id="media-search-input" class="search" name="s" value="<?php _admin_search_query(); ?>"></div>
	</div>
		<?php
	}

	/**
	 * @return array
	 */
	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 3.5.0
		 *
		 * @param string[] $taxonomies An array of registered taxonomy names 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;
		}