<?php
session_start();
ob_start();

if(isset($_POST['login-btn'])) {

	require_once "db_conn.php";

	$username = $_POST['username'];
	$password = $_POST['password'];

	$stmt = $conn->prepare("SELECT username, password FROM users WHERE username = ?, password = ? LIMIT 1");
	$stmt->bind_param("ss", $username, $password);
	$stmt->execute();
	$stmt->bind_result($username, $password);
	$stmt->store_result();

	if($stmt->num_rows > 0) {
		//login
	}

	$stmt->close();
}
$conn->close();
?>