Problem setting lat and lng variables on Google maps

Question

I put lat on the row[2] and put lng on the row[3] in my DB when I run the code below, the Google map is not visible. However, when I change variables like latitude = 25.3444 longitude = 131.0369 it works

I want to know what the problem is with the code below.

<?php
while($row = mysqli_fetch_array($result)){
if($row[0] == $num){
    $lat = $row[2];
    $lng = $row[3];
    }
}

?>

<script>    
latitude = '<?= $lat ?>';
longitude = '<?= $lng ?>';

function initMap() {
var uluru = {lat: latitude, lng: longtitude};
var map = new google.maps.Map(
  document.getElementById('map'), {zoom: 7, center: uluru});

var marker = new google.maps.Marker({position: uluru, map: map});
}
</script>

Answer 1

define $lat and lng before while

<?php
var $lat = '';
var $lng = '';
while($row = mysqli_fetch_array($result)){    
if($row[0] == $num){
    $lat = $row[2];
    $lng = $row[3];
    }
}

?>

<script>    
latitude = '<?= $lat ?>';
longitude = '<?= $lng ?>';

Answer 2

you only have to define the lat and lng to set those variables: In php:

$lat = what ever you want;
$lng = what ever you want;

In js:

let lat = what ever you want;
let lng = what ever you want;