<?php
session_start();
include_once "config.php";
$current_user = $_SESSION['unique_id'];
$sql = "SELECT * FROM users WHERE NOT unique_id = {$current_user} ORDER BY user_id DESC";
$query = mysqli_query($conn, $sql);
$output = "";
if (mysqli_num_rows($query) == 0) {
    $output .= "No users are available to chat";
} elseif (mysqli_num_rows($query) > 0) {
    include_once "list.php";
}
echo $output;
?>