Ez code

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Welcome</title>
</head>
<body>

<?php
if($_POST){
echo 'username';
}

?>
<p> -- User Information -- </p>
<form method="post">
    Username: <br>
    <input type="text" id="username" name="username"><br>
    Password: <br>
    <input type="password" id="password" name="password"><br>
    <input type="submit" value="SEND" name="submit"><br>
</form>


</body>
</html>