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<!DOCTYPE html>
<html>
<head>
    <title>Register</title>
</head>
<body>
    <form action="#" method="POST">
        <h3>Register</h3>
        Username: <input type="text" name="uname"><br>
        Password: <input type="password" name="pass"><br>
        <input type="submit" name="btn">
    </form>
</body>
</html>
<?php
    if (isset($_POST['btn'])) {
        $username = $_POST['uname'];
        $password = $_POST['pass'];

        mysql_connect("localhost","root","");
        mysql_select_db("login2");

        $query = "INSERT INTO users VALUES ('','$username','$password')";

        mysql_query($query);
        echo "Registered Successfully";
    }
    else {
        echo "Failed To Register, Try Again";
    }
?>

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
// …
}