<?php
$servername = "localhost";
$username = "root";
$password = "123456";

$db = new mysqli($servername, $username, $password);

if($db->connect_errno == 0)
{
    echo("conn succes");
}

$res = $db -> query('select * from potluck')

$rows = mysqli_fetch_assoc($res);

if ($rows != 0)
{
    echo("found smth !!")
}
$res -> free();
$db -> close();

?>