ดึงข้อมูล lattitude longtitude จากฐานข้อมูลแล้ว ปักหมุดไม่ขึ้น

<?php
	header('Content-Type: application/json');
	$link = mysqli_connect("localhost", "root", "","testplace");
	$sql = "select * from place ";
	$objQuery = mysqli_query($link,$sql);
	$resultArray = array();
	while($obResult = mysqli_fetch_assoc($objQuery))
	{
		array_push($resultArray,$obResult);
	}
	echo json_encode($resultArray);
?>

<div id="map"></div>
    <script>

      function initMap() {
      var mapOptions = {
        center: {lat: 13.847860, lng: 100.604274},
        zoom: 10,
      }
        
      var maps = new google.maps.Map(document.getElementById("map"),mapOptions);

      var marker, info;

      $.getJSON( "json.php",function(jsonObj) {
          $.each(jsonObj, function(i, item){
            marker = new google.maps.Marker({
               position: new google.maps.LatLng(item.placeLat,item.placeLong),
               map: maps,
               // title: item.placeName
            });

            info = new google.maps.InfoWindow();

            google.maps.event.addListener(marker, 'click', (function(marker, i) {
            return function() {
              info.setContent(item.placName);
              info.open(maps,marker);
            }
            })(marker, i));

          }); // loop

       });

    }
    </script>