Leaflet build polygon from data from MYSQL - leaflet

Question

Good evening I'm trying to build a polygon with some data taken from a select in my MYSQL DB, the result is that I don't see the polygon but the points.
if I enter the coordinates manually it works by building the polygon, if I use the variables of my selection the db shows me only the points corresponding to the coordinates.
I hope I was clear (I attach code)
$sql = "SELECT `LAT`,`LONG` FROM `dati`WHERE `AREA` LIKE '%001%'";
$result = $conn->query($sql); // while($r=mysqli_fetch_array($q))
if ($result->num_rows > 0) {
// output data of each row
while($row = $result->fetch_assoc()) {
// Creating latlng object
var latlngs = [[<?php echo $row["LAT"] ?> ,<?php echo $row["LONG"] ?>,] ];
// Creating a polygon
var polygon = L.polygon(latlngs, {color: 'red'});
// Adding to polygon to map
polygon.addTo(map);
</script>
<?php
}
} else {
echo "0 results";
}
$conn->close();
?>

Answer 1

Polygon is an array of points https://leafletjs.com/reference-1.7.1.html#polygon . In your code polygon is created by one point.
you should build valid leaflet polygon string, like this
$polygonData = [];
while($row = $result->fetch_assoc()) {
$polygonData[] = sprintf('[%s, %s]', $row["LAT"], $row["LONG"])
}
$polygonData = sprintf('[%s]', implode(',', $polygonData))
or some else way to generate such string format
[[37, -109.05],[41, -109.03],[41, -102.05],[37, -102.04]]
then out of while cycle
var latlngs = <?php echo $polygonData ?>
var polygon = L.polygon(latlngs, {color: 'red'});
polygon.addTo(map);