How can we pass a variable from script inside php and set it to new a variable?(Updated)

How can we pass a variable from script inside php and set it to new a variable? I want to calculate the user location and the destination location by their coordinates but first I want to get the user coordinates which is already given in the script.

<?php
function distance($lat1, $lon1, $lat2, $lon2, $unit) {
if (($lat1 == $lat2) && ($lon1 == $lon2)) {
return 0;
}
else {
$theta = $lon1 - $lon2;
$dist = sin(deg2rad($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);
} else if ($unit == "N") {
return ($miles * 0.8684);
} else {
return $miles;
}
}
}

$mResult = distance($lat, $long, 29.46786, -98.53506, "M") . " Miles<br>";
$kmResult = distance($lat, $long, 29.46786, -98.53506, "K") . " Kilometers<br>";
$nmResult = distance($lat, $long, 29.46786, -98.53506, "N") . " Nautical Miles<br>";

echo $kmResult;

?>
<script>

window.onload = function getLocation() {
if (navigator.geolocation) {
navigator.geolocation.getCurrentPosition(bindPosition);
} else {
y.innerHTML = "Geolocation is not supported by this browser.";
}
}

function bindPosition(position) {
$.ajax({
url: "/getlocation",
type: "GET",
dataType: "json",
data: {
lat: position.coords.latitude,
long: position.coords.longitude
},
success: function(response){
if(data == "success")
alert(response);
},
error: function(response){
alert('Error'+response);
console.log('Error'+response);
}
})
}
</script>

the route

Route::get('getlocation', '[email protected]');

ajax response enter image description here

enter image description here

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