Calculate the distance between two locations using PHP

In this article, we introduce a simple code to calculate the distance between two locations in PHP. For this, first we will get the latitude and longitude of both source and destination addresses in JSON format by sending request to google map geocode api. After that, we will calculate the distance between two locations from latitude and longitude in kilometer or miles.

Calculate the distance between two locations using PHP

This is the main file, that we will call on the browser. This file contains two input boxes to enter source and destination addresses and a selection option to select the unit. When the user clicks on the submit button, getRouteDistance() method will be called. This function calls the google api and gets the latitude and longitude of the entered addresses from json_encode and calculate the distance between them.

<!DOCTYPE html>
       <title>Calculate the distance between two locations</title>
       <link rel="stylesheet" href="" >
       <style type="text/css">
            .formbg { background-color: #66CCFF; padding: 10px 0 10px 20px; color: #191919;
                    border-radius: 10px;  border: 2px solid #6D0839; width: 780px; margin: 0 auto;
	   label { font-size: 18px; }
	   h1 {color: #003366;}
      function getRouteDistance($source_adrs, $dest_adrs, $unit){
          //Send request and receive json data
          $s_geocode = file_get_contents(''.$source_adrs.'&sensor=false');
          $s_latlong = json_decode($s_geocode);
          $d_geocode = file_get_contents(''.$dest_adrs.'&sensor=false');
          $d_latlong = json_decode($d_geocode);
          //Get latitude and longitude
          $lat1 = $s_latlong->results[0]->geometry->location->lat;
          $long1 = $s_latlong->results[0]->geometry->location->lng;
          $lat2 = $d_latlong->results[0]->geometry->location->lat;
          $long2 = $d_latlong->results[0]->geometry->location->lng;

          //Calculate distance from latitude and longitude
          $theta = $long1 - $long2;
          $dist = sin(deg2rad($lat1)) * sin(deg2rad($lat2)) + cos(deg2rad($lat1)) * cos(deg2rad($lat2)) * cos(deg2rad($theta));
          $dist = acos($dist);
          $dist = rad2deg($dist);
          $miles = $dist * 60 * 1.1515; 
          $unit = strtoupper($unit);
          if ($unit == "K") {
              return ($miles * 1.609344).' KM';
          } else {
              return $miles.' MI';
      <div class="form-group row formbg">
          if(($_POST['source'] != '') && ($_POST['destination'] != '')) {
              $source = $_POST['source'];
              $destination = $_POST['destination'];
              $unit = $_POST['unit'];
              $source_adrs = str_replace(' ', '+', $source);
              $dest_adrs = str_replace(' ', '+', $destination);
              $distance = getRouteDistance($source_adrs, $dest_adrs, $unit);
              if($distance != '') {
                echo 'Distance Between <b>'.$source.'</b> and <b>'.$destination.' : </b><b>'.$distance.'</b>'
          <form action="" method="post">
             <div class="form-group row">
                <label class="col-xs-3 col-form-label">Enter Source Address: </label>
                <div class="col-xs-5">
                 <input class="form-control" type="text" name="source" value="" placeholder="Source">
             <div class="form-group row">
                <label class="col-xs-3 col-form-label">Enter Destination Address: </label>
                <div class="col-sm-5">
                 <input class="form-control" type="text" name="destination" value="" placeholder="Destination">
              <div class="form-group row">
                 <label class="col-xs-3 col-form-label">Unit: </label>
                 <div class="col-sm-5">
                  <select name="unit" class="form-control">
                      <option value="k">Kilometer</option>
                      <option value="m">Mile</option>
             <div class="form-group row">
                 <label class="col-xs-3 col-form-label"> </label>
                  <div class="col-sm-5">
                   <input class="btn btn-primary" type="submit" value="Submit"/>

Related Articles

Preventing Cross Site Request Forgeries(CSRF) in PHP
PHP code to send email using SMTP
Simple pagination in PHP
Simple PHP File Cache
PHP Connection and File Handling on FTP Server
Sending form data to an email using PHP
Recover forgot password using PHP and MySQL
How to display PDF file in PHP from database
How to read CSV file in PHP and store in MySQL
Create And Download Word Document in PHP

Read more articles

General Knowledge

Learn Popular Language