The POST method transfers information via HTTP headers. The information is encoded as described in case of GET method and put into a header called QUERY_STRING.
Code
<?php
if( $_POST["username"] || $_POST["email"] ) {
echo "Username". $_POST['username']. "<br />";
echo "Email ". $_POST['email']. ";
die;
}
?>
<html>
<body>
<form action="" method = "POST">
Username: <input type = "text" name = "username" />
Email: <input type = "text" name = "email" />
<input type = "submit" />
</form>
</body>
</html>
