<?php
if($_POST){
$username = $_POST["username"];
$password= $_POST["password"];
if(!$username || !$password){
echo "Boş Alan Bırakmayın";
}
}
?>
<form action="" method="post">
<td>Kullanıcı Adı</td>
<input type="text" name="username"><br>
<td>Şifre</td>
<input type="password" name="password"><br>
<button type="submit">Gönder </button>
</form>
