Get distance in Km between two lat lan address using Google Maps API

Question

When running this code it did not give any value. But when replace lat lan value with (37.910689 ,-97.250977),(16.110560, -94.174805) then it returns result in meters. It shows blank output when passed any other lat lan value then the USA address.

function location(){

    $url="https://maps.googleapis.com/maps/api/distancematrix/json?units=metric&origins=28.666585,-77.229059&destinations=28.667053%2C-77.219898&key=Api key";

    $json_string = $url; 
    $jsondata = file_get_contents($json_string);
    $obj = json_decode($jsondata, TRUE); // Set second argument as TRUE

    //print_r($obj['rows']); // Now this will works!
    $prn=$obj['rows'];  
    foreach($prn as $row)
    { 
        $ele=$row['elements'];
        foreach($ele as $k)
        { 
            $dis=$k['distance'];
            foreach($dis as $l=> $lvalue){
                $meter= $lvalue  ;
            }
        }
    }   

    return $meter ;
}

Possible duplicate of [Calculate distance between two points in google maps V3](https://stackoverflow.com/questions/1502590/calculate-distance-between-two-points-in-google-maps-v3) — TarangP, Feb 10 '18 at 07:29
What are you asking for? How to calculate DISTANCE? or how to calculate DRIVING DISTANCE? — MrUpsidown, Feb 10 '18 at 11:15

Touheed Khan · Answer 1 · 2018-02-10T08:09:13.460

Try this code for calculating driving distance and time.

Code :

<?php

function GetDrivingDistance($lat1, $lat2, $long1, $long2)
{
    $url = "https://maps.googleapis.com/maps/api/distancematrix/json?origins=".$lat1.",".$long1."&destinations=".$lat2.",".$long2."&mode=driving&language=pl-PL";
    $ch = curl_init();
    curl_setopt($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);

    $status = "ERROR"; 
    $dist   = 0;
    $time   = 0;
    if($response_a['rows'][0]['elements'][0]['status'] === 'OK') {
        $dist   = $response_a['rows'][0]['elements'][0]['distance']['text'];
        $time   = $response_a['rows'][0]['elements'][0]['duration']['text'];
        $status = "OK";
    }

    return array('status' => $status, 'distance' => $dist, 'time' => $time);
}

Test : 1. Distance between Mumbai and Delhi 2. Random invalid lat lan.

$dist = GetDrivingDistance(19.228825, 28.644800,72.854118, 77.216721);
var_dump($dist);
// OUTPUT : array(3) { ["status"]=> string(2) "OK" ["distance"]=> string(9) "1 386 km" ["time"]=> string(15) "22 godz. 35 min" }
$dist = GetDrivingDistance(888.228825, 28.644800,72.854118, 77.216721);
var_dump($dist);
// OUTPUT : array(3) { ["status"]=> string(5) "ERROR" ["distance"]=> int(0) ["time"]=> int(0) }

Tip : You can get more details by var_dump($response_a) inside functions.

PS : Make sure you are giving proper LAT LAN.

I already Use Harvesine formula but the Harvesine formula give distance is 200meter less than the google map distance result . — Sandeep Kumar, Feb 10 '18 at 07:37
Try update code, I have tested it for finding distance between Mumbai and Delhi. — Touheed Khan, Feb 10 '18 at 07:50

Ari Singh · Accepted Answer · 2018-02-10T08:16:25.270

The two points you specified in your code are in the Atlantic ocean. You can verify by entering 28.667053,-77.219898 in search box at https://www.google.com. Google responds with ZERO_RESULTS, because it cannot calculate the distance between 2 points in ocean.

UPDATE: Note that what the google map api gives you is NOT the aerial or the shortest distance between 2 points or "as the crow flies" distance. It is the driving distance or walking distance. So it has to know about the 2 points before it can give you a distance. If it does not know the 2 points or cannot calculate the route to the 2 points it will not give results. https://maps.googleapis.com/maps/api/distancematrix/json?units=metric&origins=20.254916,76.715059&destinations=20.3127202,76.6839331 - these points are close but driving / walking distance is large. Goole maps gives the driving / walking distance.

{
"destination_addresses": [
"28.667053,-77.219898"
],
"origin_addresses": [
"28.666585,-77.229059"
],
"rows": [
{
"elements": [
{
"status": "ZERO_RESULTS"
}
]
}
],
"status": "OK"
}

Google responds with correct distance for 2 points within US e.g https://maps.googleapis.com/maps/api/distancematrix/json?units=metric&origins=42.025819,-88.0854497&destinations=41.910088,-87.6929887

yeah its woring fine for usa address but not working for indian address. — Sandeep Kumar, Feb 10 '18 at 07:48

Get distance in Km between two lat lan address using Google Maps API

2 Answers2