How to create a json with several arrays in php - php

Question

I have several regions in my database table, I want to create a JSON that has arrays of each region. something like this:
var regions = {
"region1": [
{ "lat": -1.325416, "lng": 36.669051 },
{ "lat": -1.244058, "lng": 36.730391 },
{ "lat": -1.392932, "lng": 36.768752 }
],
"region2": [
{ "lat": -1.244058, "lng": 36.730391 },
{ "lat": -1.392932, "lng": 36.768752 },
{ "lat": -1.169516, "lng": 36.895608 }
],
"region3": [
{ "lat": -1.392932, "lng": 36.768752 },
{ "lat": -1.169516, "lng": 36.895608 },
{ "lat": -1.390505, "lng": 36.810023 }
]
}
How do I do that? Thanks
This is my php code:
<?php
include 'conn.php';
$sql = "select lat,lon from regions";
$res = mysqli_query($conn,$sql);
$result = array();
while($row = mysqli_fetch_array($res)){
array_push($result,
array('lat' => " ".$row[0],
'lng' => " ".$row[1]
));
}
$data = json_encode($result,JSON_NUMERIC_CHECK);
echo $data;
?>
It gives a json for all regions.

Answer 1

You can do something like this:
First, get all regions.
Then for each region you have, get the remaining data.
$finalResult = array();
foreach ($regions as $region) {
$sql = "SELECT lat, lon FROM regions WHERE regionid = $region['regionid'];";
$res = mysqli_query($conn,$sql);
$result = array();
while($row = mysqli_fetch_array($res)){
array_push($result, array(
'lat' => " ".$row[0],
'lng' => " ".$row[1],
));
}
array_push($finalResult, array(
$region['regionName'] => $result,
));
}
echo json_encode($finalResult, JSON_NUMERIC_CHECK);