protected function do_chart_city() {

		$allcity = $this->get_all_city();
		$city    = $this->get_city_count( $allcity );

		$array = array( array( 'City', 'Amount' ) );
		foreach ( $city as $value ) {
			array_push( $array, array( $value[1], $value[4] ) );
		}

		return wp_send_json( $array );

	}