FabrikaHradekTour/res/forum/api/list_users.php

<?php

include("../../global.php");
session_start();

if (!isset($_SESSION["username"])) goto fail;

$out = $database -> query("SELECT username, admin FROM user WHERE username=\"" . $_SESSION["username"] . "\" AND admin=\"1\"");

if ($out -> num_rows != 1)
{
    fail:
    echo "nope";
    header("Location: ../../../index.php");
    return;
}


$out = $database -> query("SELECT username FROM user ORDER BY id ASC");

$output = array();

while ($res = $out -> fetch_assoc())
{
    array_push($output, $res["username"]);
}

header('Content-type: application/json');
echo json_encode(["users" => $output]);