Source

File: wp-admin/includes/class-wp-media-list-table.php

protected function get_views() {
		global $post_mime_types, $avail_post_mime_types;

		$type_links = array();

		$filter = empty( $_GET['attachment-filter'] ) ? '' : $_GET['attachment-filter'];

		$type_links['all'] = sprintf(
			'<option value=""%s>%s</option>',
			selected( $filter, true, false ),
			__( 'All media items' )
		);

		foreach ( $post_mime_types as $mime_type => $label ) {
			if ( ! wp_match_mime_types( $mime_type, $avail_post_mime_types ) ) {
				continue;
			}

			$selected = selected(
				$filter && 0 === strpos( $filter, 'post_mime_type:' ) &&
					wp_match_mime_types( $mime_type, str_replace( 'post_mime_type:', '', $filter ) ),
				true,
				false
			);

			$type_links[ $mime_type ] = sprintf(
				'<option value="post_mime_type:%s"%s>%s</option>',
				esc_attr( $mime_type ),
				$selected,
				$label[0]
			);
		}

		$type_links['detached'] = '<option value="detached"' . ( $this->detached ? ' selected="selected"' : '' ) . '>' . __( 'Unattached' ) . '</option>';

		$type_links['mine'] = sprintf(
			'<option value="mine"%s>%s</option>',
			selected( 'mine' === $filter, true, false ),
			_x( 'Mine', 'media items' )
		);

		if ( $this->is_trash || ( defined( 'MEDIA_TRASH' ) && MEDIA_TRASH ) ) {
			$type_links['trash'] = sprintf(
				'<option value="trash"%s>%s</option>',
				selected( 'trash' === $filter, true, false ),
				_x( 'Trash', 'attachment filter' )
			);
		}

		return $type_links;
	}