Get driving distance between two points using Google Maps API

Question

I'm trying to get driving distance between two points using Google Maps API. Now, I have code which get direct distance:

This function get lat and lng:

function get_coordinates($city, $street, $province) {     $address = urlencode($city.','.$street.','.$province);     $url = "http://maps.google.com/maps/api/geocode/json?address=$address&sensor=false&region=Poland";     $ch = curl_init();     curl_setopt($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);     $return = array('lat' => $response_a->results[0]->geometry->location->lat, 'long' => $long = $response_a->results[0]->geometry->location->lng);      return $return; } 

This function calculate distance between two points based on lat & lng:

function getDistanceBetweenPoints($lat1, $lon1, $lat2, $lon2) {     $theta = $lon1 - $lon2;     $miles = (sin(deg2rad($lat1)) * sin(deg2rad($lat2))) + (cos(deg2rad($lat1)) * cos(deg2rad($lat2)) * cos(deg2rad($theta)));     $miles = acos($miles);     $miles = rad2deg($miles);     $miles = $miles * 60 * 1.1515;     $kilometers = $miles * 1.609344;     return $kilometers; } 

This function print distance by kilometers:

function get_distance($lat1, $lat2, $long1, $long2) {     /* These are two points in New York City */     $point1 = array('lat' => $lat1, 'long' => $long1);     $point2 = array('lat' => $lat2, 'long' => $long2);      $distance = getDistanceBetweenPoints($point1['lat'], $point1['long'], $point2['lat'], $point2['long']);     return $distance; } 

Usage:

$coordinates1 = get_coordinates('Katowice', 'Korfantego', 'Katowicki'); $coordinates2 = get_coordinates('Tychy', 'Jana Pawła II', 'Tyski');  echo 'Distance: <b>'.round(get_distance($coordinates1['lat'], $coordinates2['lat'], $coordinates1['long'], $coordinates2['long']), 1).'</b> km'; 

But this code get direct distance. I need driving distance. How I can get driving distance using google maps API?

Thanks for your help!

Answer 1

OK, I found solution using distance matrix: https://developers.google.com/maps/documentation/distancematrix/#DistanceMatrixRequests

This function get lat & lng from city, adress, province:

function get_coordinates($city, $street, $province) {     $address = urlencode($city.','.$street.','.$province);     $url = "http://maps.google.com/maps/api/geocode/json?address=$address&sensor=false&region=Poland";     $ch = curl_init();     curl_setopt($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);     $status = $response_a->status;      if ( $status == 'ZERO_RESULTS' )     {         return FALSE;     }     else     {         $return = array('lat' => $response_a->results[0]->geometry->location->lat, 'long' => $long = $response_a->results[0]->geometry->location->lng);         return $return;     } } 

This function calculate driving distance and travel time duration:

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);     $dist = $response_a['rows'][0]['elements'][0]['distance']['text'];     $time = $response_a['rows'][0]['elements'][0]['duration']['text'];      return array('distance' => $dist, 'time' => $time); } 

Usage:

$coordinates1 = get_coordinates('Tychy', 'Jana Pawła II', 'Śląskie'); $coordinates2 = get_coordinates('Lędziny', 'Lędzińska', 'Śląskie'); if ( !$coordinates1 || !$coordinates2 ) {     echo 'Bad address.'; } else {     $dist = GetDrivingDistance($coordinates1['lat'], $coordinates2['lat'], $coordinates1['long'], $coordinates2['long']);     echo 'Distance: <b>'.$dist['distance'].'</b><br>Travel time duration: <b>'.$dist['time'].'</b>'; } 

Return:

Distance: 11,2 km Travel time duration: 15 min