PHP Class for reverse querying the openstreetmaps api

class.geo.php

<?php

use GuzzleHttp\Client;

class esdeGeo {

    /**
     * Constructor with all needed parameters
     *
     * @param [type] $lat
     * @param [type] $lon
     * @param string $lang
     * @param integer $zoom
     * @param string $format
     */

	function __construct($lat = null, $lon = null, $lang = 'en', $zoom = 16, $format = 'json') {
        $this->api = 'https://nominatim.openstreetmap.org/reverse?namedetails=1&';
        $this->lang = $lang;
        $this->format = $format;
        $this->zoom = $zoom;
        $this->lat = $lat;
        $this->lon = $lon;
        $this->response = null;
    }


    /**
     * Build the query
     *
     * @return void
     */

    private function buildQuery() {
        $url = $this->api . 'format=' . $this->format . '&zoom=' . $this->zoom . '&lat=' . $this->lat . '&lon=' . $this->lon . '&accept-language=' . $this->lang;
        return $url;
    }

    /**
     * Set Response of API Call
     *
     * @return void
     */

    private function setResponse() {
        $url = $this->buildQuery();
        $client = new GuzzleHttp\Client;
        $response = $client->get($url);

        if ($response->getStatusCode() == 200) {
            $body = $response->getBody();
            $body = (string)$body;
            $body = json_decode($body);
            $this->response = $body;
        } else {
            return false;
        }

        return true;
    }
 
    /**
     * getCountryname
     *
     * @return void
     */

    public function getCountry() {
        if (empty($this->response)) {
            $this->setResponse();
        }

       	$country = $this->response->address->country;
       	if ($country == 'PRC' && $this->lang == 'en') {
       		$country = 'China';
       	} elseif($this->response->address->country_code == 'es') {
       		$re = '/ \(([^)]+)\)/m';

            preg_match_all($re, $country, $matches, PREG_SET_ORDER, 0);

            if (isset($matches[0]) && isset($matches[0][0])) {
            	$country = str_replace($matches[0][0], '', $country);
            }
       	}
		return $country;
    }

    /**
     * Get the Country code
     *
     * @return void
     */
    
    public function getCountryCode() {
		if (empty($this->response)) {
			$this->setResponse();
		}

		$country_code = $this->response->address->country_code;
		return $country_code;
	}

    /**
     * Get the Data and set the response
     *
     * @return void
     */

    public function getData() {
		if (empty($this->response)) {
			$this->setResponse();
		}
		return $this->response;
	}
}