login.php

<!DOCTYPE HTML>
<html lang="pl">
<head>
    <meta charset="utf-8">
</head>
<body>
<?php
    require_once "connect.php";

    $connect1 = @new mysqli($host, $dbuser, $dbpass, $dbname);

    if ($connect1->connect_errno!=0) {
        echo "Error: ".$connect1->connect_errno;
    }
    else {
        $login = $_POST['login'];
        $pass = $_POST['pass'];

        $query = "SELECT * FROM uzytkownicy WHERE user='$login' AND $pass='$pass'";
        if ($result = @$connect1->query($query))
        {
            $users_num = $result->num_rows;
            if($users_num>0)
            {
                $row = $result->fetch_assoc();
                $user = $row['user'];


                $result->free_result();
                echo $user;

            }   else {

            }
        }

        $connect1->close();
    }

?>
</body>
</html>