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Hello! In this post, you will learn how to calculate distance between two places using google map API in php.Here you will calculate by air distance between two countries. See below ..how to do it.


<?php
function getDistance($addressFrom, $addressTo, $unit){
    //Change address format
    $formattedAddrFrom = str_replace(' ','+',$addressFrom);
    $formattedAddrTo = str_replace(' ','+',$addressTo);
    
   //Send request and receive json data
$geocodeFrom = file_get_contents('https://maps.google.com/maps/api/geocode/json?address='.$formattedAddrFrom.'&sensor=false&key=AIzaSyBOMQKyG37IA6VhextrNpB0YxQnsR6Phys');
$outputFrom = json_decode($geocodeFrom);
$geocodeTo = file_get_contents('https://maps.google.com/maps/api/geocode/json?address='.$formattedAddrTo.'&sensor=false&key=AIzaSyBOMQKyG37IA6VhextrNpB0YxQnsR6Phys');
$outputTo = json_decode($geocodeTo);
    
    //print_r($outputFrom);
    //Get latitude and longitude from geo data
    $latitudeFrom = $outputFrom->results[0]->geometry->location->lat;
    $longitudeFrom = $outputFrom->results[0]->geometry->location->lng;
    $latitudeTo = $outputTo->results[0]->geometry->location->lat;
    $longitudeTo = $outputTo->results[0]->geometry->location->lng;
    //Calculate distance from latitude and longitude
    $theta = $longitudeFrom - $longitudeTo;
    $dist = sin(deg2rad($latitudeFrom)) * sin(deg2rad($latitudeTo)) +  cos(deg2rad($latitudeFrom)) * cos(deg2rad($latitudeTo)) * cos(deg2rad($theta));
    $dist = acos($dist);
    $dist = rad2deg($dist);
    $miles = $dist * 60 * 1.151;
    $unit = strtoupper($unit);
    if ($unit == "K") {
        return ($miles * 1.609344).' km';
    } else if ($unit == "N") {
        return ($miles * 0.8684).' nm';
    } else {
        return $miles.' mi';
    }
}
 
if(isset($_REQUEST['cal']))
{
    
$addressFrom = $_POST['addressfrom'];
$addressTo =$_POST['addressto'];
 
$distance = getDistance($addressFrom, $addressTo, "K");
 
}
?>
<html>
<head>
<title>Distance Calculation </title>
<style>
* {
    margin: 0;
    padding: 0;
}
.container {
    width: 800px;
    margin: 0 auto;
    border: 0px green dashed;
}
p {
    text-align: center;
    margin-bottom: 15px;
    padding: 5px;
    font-size: 16px;
}
input {
    padding: 10px;
    width: 500px;
    font-size: 16px;
    border: 1px #003366 solid;
}
textarea {
    width: 500px;
    height: 150px;
    resize: none;
    font-size: 16px;
    padding: 10px;
    border: 1px #003366 solid;
}
</style>
 
 <link type="text/css" rel="stylesheet" href="https://fonts.googleapis.com/css?family=Roboto:300,400,500">
        <script src="https://maps.googleapis.com/maps/api/js?key=AIzaSyBOMQKyG37IA6VhextrNpB0YxQnsR6Phys&libraries=places"></script>
        <script>
            var autocomplete;
            function initialize() {
              autocomplete = new google.maps.places.Autocomplete(
                  /** @type {HTMLInputElement} */(document.getElementById('autocomplete')),
                  { types: ['geocode'] });
                  
              google.maps.event.addListener(autocomplete, 'place_changed', function() {
              });
              
              autocomplete = new google.maps.places.Autocomplete(
                  /** @type {HTMLInputElement} */(document.getElementById('autocomplete1')),
                  { types: ['geocode'] });
                  
              google.maps.event.addListener(autocomplete1, 'place_changed', function() {
              });
            }
        </script>
        </head>
        <body onload="initialize()">
       
<div class="container" id="locationField">
<center>
<h1>Distance: <?php 
if(isset($distance))
{
 echo $distance;
}
 ?></h1>
</center>
  <form action="" method="post">
    <p>
      <input type="text" required placeholder="From" name="addressfrom" id="autocomplete" onFocus="geolocate()" />
    </p>
    <p>
  <input type="text" required placeholder="To"  name="addressto" id="autocomplete1" onFocus="geolocate()" />
    </p> 
    <p>
      <input type="submit" name="cal" value="Calculate">
    </p>
  </form>
</div>
</body>
</html>

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<?php

function getDistance($addressFrom, $addressTo, $unit){

//Change address format

$formattedAddrFrom = str_replace(' ','+',$addressFrom);

$formattedAddrTo = str_replace(' ','+',$addressTo);

//Send request and receive json data

$geocodeFrom = file_get_contents('https://maps.google.com/maps/api/geocode/json?address='.$formattedAddrFrom.'&sensor=false&key=AIzaSyBOMQKyG37IA6VhextrNpB0YxQnsR6Phys');

$outputFrom = json_decode($geocodeFrom);

$geocodeTo = file_get_contents('https://maps.google.com/maps/api/geocode/json?address='.$formattedAddrTo.'&sensor=false&key=AIzaSyBOMQKyG37IA6VhextrNpB0YxQnsR6Phys');

$outputTo = json_decode($geocodeTo);

//print_r($outputFrom);

//Get latitude and longitude from geo data

$latitudeFrom = $outputFrom->results[0]->geometry->location->lat;

$longitudeFrom = $outputFrom->results[0]->geometry->location->lng;

$latitudeTo = $outputTo->results[0]->geometry->location->lat;

$longitudeTo = $outputTo->results[0]->geometry->location->lng;

//Calculate distance from latitude and longitude

$theta = $longitudeFrom - $longitudeTo;

$dist = sin(deg2rad($latitudeFrom)) * sin(deg2rad($latitudeTo)) + cos(deg2rad($latitudeFrom)) * cos(deg2rad($latitudeTo)) * cos(deg2rad($theta));

$dist = acos($dist);

$dist = rad2deg($dist);

$miles = $dist * 60 * 1.151;

$unit = strtoupper($unit);

if ($unit == "K") {

return ($miles * 1.609344).' km';

} else if ($unit == "N") {

return ($miles * 0.8684).' nm';

} else {

return $miles.' mi';

}

if(isset($_REQUEST['cal']))

{

$addressFrom = $_POST['addressfrom'];

$addressTo =$_POST['addressto'];

$distance = getDistance($addressFrom, $addressTo, "K");

}

<html>

<head>

<title>Distance Calculation </title>

<style>

* {

margin: 0;

padding: 0;

}

.container {

width: 800px;

margin: 0 auto;

border: 0px green dashed;

}

p {

text-align: center;

margin-bottom: 15px;

padding: 5px;

font-size: 16px;

}

input {

padding: 10px;

width: 500px;

font-size: 16px;

border: 1px #003366 solid;

}

textarea {

width: 500px;

height: 150px;

resize: none;

font-size: 16px;

padding: 10px;

border: 1px #003366 solid;

}

</style>

var autocomplete;

function initialize() {

autocomplete = new google.maps.places.Autocomplete(

/** @type {HTMLInputElement} */(document.getElementById('autocomplete')),

{ types: ['geocode'] });

google.maps.event.addListener(autocomplete, 'place_changed', function() {

});

autocomplete = new google.maps.places.Autocomplete(

/** @type {HTMLInputElement} */(document.getElementById('autocomplete1')),

{ types: ['geocode'] });

google.maps.event.addListener(autocomplete1, 'place_changed', function() {

});

}

</script>

</head>

<h1>Distance: <?php

if(isset($distance))

{

echo $distance;

}

?></h1>

</center>

<p>

</p>

<p>

</p>

<p>

</p>

</form>

</div>

</body>

</html>

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