get city name from latitude and longitude in php using geocode api

1var x=document.getElementById("demo");
2function getLocation(){
3    if (navigator.geolocation){
4        navigator.geolocation.getCurrentPosition(showPosition,showError);
5    }
6    else{
7        x.innerHTML="Geolocation is not supported by this browser.";
8    }
9}
10
11function showPosition(position){
12    lat=position.coords.latitude;
13    lon=position.coords.longitude;
14    displayLocation(lat,lon);
15}
16
17function showError(error){
18    switch(error.code){
19        case error.PERMISSION_DENIED:
20            x.innerHTML="User denied the request for Geolocation."
21        break;
22        case error.POSITION_UNAVAILABLE:
23            x.innerHTML="Location information is unavailable."
24        break;
25        case error.TIMEOUT:
26            x.innerHTML="The request to get user location timed out."
27        break;
28        case error.UNKNOWN_ERROR:
29            x.innerHTML="An unknown error occurred."
30        break;
31    }
32}
33
34function displayLocation(latitude,longitude){
35    var geocoder;
36    geocoder = new google.maps.Geocoder();
37    var latlng = new google.maps.LatLng(latitude, longitude);
38
39    geocoder.geocode(
40        {'latLng': latlng}, 
41        function(results, status) {
42            if (status == google.maps.GeocoderStatus.OK) {
43                if (results[0]) {
44                    var add= results[0].formatted_address ;
45                    var  value=add.split(",");
46
47                    count=value.length;
48                    country=value[count-1];
49                    state=value[count-2];
50                    city=value[count-3];
51                    x.innerHTML = "city name is: " + city;
52                }
53                else  {
54                    x.innerHTML = "address not found";
55                }
56            }
57            else {
58                x.innerHTML = "Geocoder failed due to: " + status;
59            }
60        }
61    );
62}

1<p><button onclick="getLocation()">Get My Location</button></p>
2<p id="demo"></p>
3<script src="http://maps.google.com/maps/api/js?key=YOUR_API_KEY"></script>