public function format_for_csv( array $items ): array {
		$csv_data = [];

		// Use the values of get_columns() as CSV headers.
		$csv_headers = array_values( $this->get_columns() );
		$csv_data[]  = $csv_headers;

		// Iterate over each item and format the data.
		foreach ( $items as $item ) {
			$csv_row = [];
			foreach ( array_keys( $this->get_columns() ) as $header ) {
				$method_name = 'column_' . $header;
				if ( method_exists(
					$this,
					$method_name
				) ) {
					// Dynamically call the method for the column.
					$value = call_user_func(
						[
							$this,
							$method_name,
						],
						$item
					);
				} else {
					// Accessing the item properties directly using column_default.
					$value = $this->column_default(
						$item,
						$header
					);
				}

				$csv_row[] = $this->sanitize_and_format_csv_value( $value );
			}
			$csv_data[] = $csv_row;
		}

		return $csv_data;
	}