How to calculate distance between two places using php?

Question

I want to display distance between hotel and user. For calculation Distance between hotel and user address I have used following code. Distance value I have get on button click.

1) First I have getting use IP address and get all user address information from IP address.

$ipAddress  = $_SERVER['REMOTE_ADDR'];
$result = json_decode(file_get_contents("http://ip-api.com/json/{$ipAddress}"));

This call give me details like city, country, countryCode, latitude, longitude, zip etc. Save latitude and longitude.

$user_latitude = $result->lat;
$user_longitude = $result->lon;

2) I have hotel latitude and longitude in our database already.

now I have four value. User latitude/longitude and Hotel latitude/longitude
$lat1   =   $user_latitude;
$long1  =   $user_longitude;
$lat2   =   $hotel_latitude;
$long2  =   $hotel_longitude;

3) After that with the use of google map API I have get full address of both (User and Hotel)

$url = "http://maps.googleapis.com/maps/api/geocode/json?latlng={$lat1},{$long1}&sensor=true";
$url2 = "http://maps.googleapis.com/maps/api/geocode/json?latlng={$lat2},{$long2}&sensor=true";

# Get address of User
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_PROXYPORT, 3128);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
$response = curl_exec($ch);
curl_close($ch);
$response_a = json_decode($response, true);
$address1 = $response_a['results'][0]['formatted_address'];

# Get address of Hotel
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url2);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_PROXYPORT, 3128);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
$response = curl_exec($ch);
curl_close($ch);
$response_a = json_decode($response, true);
$address2 = $response_a['results'][0]['formatted_address'];

$find = array("'",'"');
$replace = array("","");
$address1 = str_replace($find,$replace,$address1);
$address2 = str_replace($find,$replace,$address2);

4) At last I have use distance matrix API of google and get distance between two points.

$url = "https://maps.googleapis.com/maps/api/distancematrix/json?origins=".$lat1.",".$long1."&destinations=".$lat2.",".$long2."&alternatives=true&mode=driving&language=de-DE&sensor=false";

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_PROXYPORT, 3128);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
$response = curl_exec($ch);
curl_close($ch);
$response_a = json_decode($response, true);

$distance = $response_a['rows'][0]['elements'][0]['distance']['text'];
$time = $response_a['rows'][0]['elements'][0]['duration']['text'];

5) Distance is save in $distance and total time save in $time. It also give other details which you view in $response_a. Print the value of $response_a.

But all time it give me incorrect distance.

Once you have two latitudes/longitudes, you simply use the *Great Circle distance formula*; it's pretty simple, look it up. No need to convert coordinates to addresses and use APIs. Having said this, yes, looking up a location *by IP* will only give you very very ***veeeery*** rough locations at best and accuracy will only be good up to city or state level; most certainly not accurate to within a few kilometers. — deceze, Aug 15 '16 at 07:05

score 0 · Answer 1 · edited May 23 '17 at 11:51

This stackoverflow thread has several implementations of the Haversine formula, which is used for distance calculation. In that thread, a PHP implementation is included as well, which I blatantly copied and pasted below.

<?php function distance($lat1, $lon1, $lat2, $lon2) {

    $pi80 = M_PI / 180;
    $lat1 *= $pi80;
    $lon1 *= $pi80;
    $lat2 *= $pi80;
    $lon2 *= $pi80;

    $r = 6372.797; // mean radius of Earth in km
    $dlat = $lat2 - $lat1;
    $dlon = $lon2 - $lon1;
    $a = sin($dlat / 2) * sin($dlat / 2) + cos($lat1) * cos($lat2) * sin($dlon / 2) * sin($dlon / 2);
    $c = 2 * atan2(sqrt($a), sqrt(1 - $a));
    $km = $r * $c;

    //echo '<br/>'.$km;
    return $km;
}
?>

All credits go to the guy who posted the implementation in the thread linked above.

Thank you for answered I want calculate distance by road. I have already use function which you give. but it also give me wrong distance. — Vimal Patel, Aug 15 '16 at 09:08

score 0 · Answer 2 · edited May 23 '17 at 12:00

0

If you want the distance between two point, you could use that, but if you want an itinerary's distance, you might want to use Google Directions API or some equivalent.

edited May 23 '17 at 12:00

Community

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answered Aug 15 '16 at 07:37

vincenth

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Thank you for your answere I have already use distance matrix API of google map – Vimal Patel Aug 15 '16 at 09:11
@vincenth It is not accurate, it returns rough results with more then 50 km difference from real location. For your information i am working on same project as Vimal Patel – papacico Aug 15 '16 at 21:21
Then you could try other services, I think OpenStreetMap provides an equivalent, but I can't help you further. Good luck. – vincenth Aug 15 '16 at 21:44

How to calculate distance between two places using php?

2 Answers2