Geolocalizzazione di indirizzi (geocoding) con PHP o jQuery e Nominatim di OpenStreetMap

        <h2>Inserisci l'indirizzo di una località</h2>
        <form name='geocoding' id='geocoding' action='' method='post'>
			<label for='address'>Indirizzo:
			<input type='text' name='address' id='address' placeholder='Es: 1 Piazza del Colosseo'>
			</label><br>
			<label for='city'>Città:
			<input type='text' name='city' id='city' placeholder='Es: Roma'>
			</label><br>
			<label for='county'>Provincia:
			<input type='text' name='county' id='county' placeholder='Es: RM'>
			</label><br>
			<label for='country'>Nazione:
			<input type='text' name='country' id='country' placeholder='Es: Italy'>
			</label><br>
			<button type="submit" name='submitButton' id='submitButton'>Invia</button>
			<button type="reset" name='reset' id='reset'>Pulisci</button>
		</form>
      </div>
      <div class="one-half column" style="margin-top: 5%">
        <h4>Risultato:</h4>
		<div id='results'>
		</div>
      </div>
    </div>

	$(document).ready(function(){		
		$( "#geocoding" ).submit(function( event ) {
			$('#results').html("");
			var address = $('#address').val().replace(","," ");
			address =  $.trim(address);
			var city = $('#city').val().trim();
			var county = $('#county').val().trim();
			var country = $('#country').val().trim();
			var query_string = address+","+city+","+county+","+country;
			query_string += "&format=json&limit=1&polygon=0&addressdetails=0";
			var geocodingAPI = "http://nominatim.openstreetmap.org/search?q=";
			geocodingAPI += query_string;
			$.getJSON(geocodingAPI, function (json) {
				//console.log(json);
				if ($.isEmptyObject(json)) {
					$('#results').html('<p>Nessun risultato!</p>');
				} else {
					var table = '<table>';
					$.each(json[0], function(key, value) {
						table += '<tr><td>'+key+'</td><td>'+value+'</td></tr>';
					});
					table += '</table>';
					$('#results').append(table);
					$('#results').append("<p><a href='"+geocodingAPI.replace("json","html")+"'>Vedi il risultato su OpenStreetMap</a></p>");
				}
			});	
 
		  event.preventDefault();
 
		});
 
	  $('#reset').click(function(){
			$('#results').html("");
			return true;
	  });			
	});

<div id='results'>
	<?php
		if (!empty($_POST)) {
			$geocodingAPI = "http://nominatim.openstreetmap.org/search?q=";
			$_POST = array_map('clean', $_POST);
			extract($_POST);
			$address = str_replace(","," ",$address);
			$qs = $address.",".$city.",".$county.",".$country;
 
			$qs .= "&format=json&limit=1&polygon=0&addressdetails=0";
			$rs = json_decode(file_get_contents($geocodingAPI.$qs));
 
			echo "<table>\n";
			echo "<tr> <td>place_id</td> <td>".$rs[0]->place_id."</td> </tr>\n";
			echo "<tr> <td>licence</td> <td>".$rs[0]->licence."</td> </tr>\n";
			echo "<tr> <td>osm_type</td> <td>".$rs[0]->osm_type."</td> </tr>\n";
			echo "<tr> <td>osm_id</td> <td>".$rs[0]->osm_id."</td> </tr>\n";
			echo "<tr> <td>boundingbox</td> <td>".$rs[0]->boundingbox."</td> </tr>\n";
			echo "<tr> <td>lat</td> <td>".$rs[0]->lat."</td> </tr>\n";
			echo "<tr> <td>lon</td> <td>".$rs[0]->lon."</td> </tr>\n";
			echo "<tr> <td>display_name</td> <td>".$rs[0]->display_name."</td> </tr>\n";
			echo "<tr> <td>class</td> <td>".$rs[0]->class."</td> </tr>\n";
			echo "<tr> <td>type</td> <td>".$rs[0]->type."</td> </tr>\n";
			echo "<tr> <td>importance</td> <td>".$rs[0]->importance."</td> </tr>\n";
			echo "</table>\n";
 
			$linkQs = str_replace("json","html",$qs);
 
			echo "<p><a href='".$geocodingAPI.$linkQs."'>Vedi il risultato su OpenStreetMap</a></p>";
 
		}
		function clean($el)	{
			 return urlencode(strip_tags(trim($el)));
		}			
	?>
</div>