Create JSON file and display - php

Question

I want to create a JSON file based in MySQL data but for some reasons my code is not working at all(I dont have any errors)
$results= $panel->query('SELECT * FROM servers ORDER BY id ASC;')->fetch_all();
$data = array();
foreach ($results as $row) {
$data[] = $row;
}
$json_string = json_encode($data);
$file = 'servers.json';
file_put_contents($file, $json_string);
What I want:
{
"ID": [
"IPOFTHESERVERFROMDATABASE",
PORTFROMDATABASE,
"NAMEFROMDATABASE"
],
..
}
What I'm getting:
[["ID","NAME","IP","PORT","RCON"]]

Answer 1

You are not putting anything into the $data array.
Change the code as below to load the rows into the $data array before json_encode()ing it
$results= $panel->query('SELECT * FROM servers ORDER BY id ASC;')->fetch_all();
$data = array();
foreach ($results as $row) {
$data[] = $row;
}
$json_string = json_encode($data);
$file = 'servers.json';
file_put_contents($file, $json_string);
Or as Ray says below, as you have used a fetchAll you could probably do without the foreach loop and do
$results= $panel->query('SELECT * FROM servers ORDER BY id ASC;')->fetch_all();
$json_string = json_encode($results);
$file = 'servers.json';
file_put_contents($file, $json_string);
EDIT: The output you wanted?
You say you want
{
"ID": [
"IP",
PORT,
"NAME"
],
"ID": [
"IP",
PORT,
"NAME"
]
}
which of course is not possible as you have 2 keys/properties with the same name i.e. "ID"
$results= $panel->query('SELECT * FROM servers ORDER BY id ASC;')->fetch_all();
$data = array();
foreach ($results as $row) {
$data[$row[0]] = [$row[2],$row[3],$row[1]];
}
$json_string = json_encode($data);
$file = 'servers.json';
file_put_contents($file, $json_string);