HTML Form
<form action="useless.php" method="post">
<input type="text" name="user_input" />
<input type="submit" />
</form>
PHP Post
echo $_POST['user_input];
PHP Forms
<form action="useless.php" method="post">
<input type="text" name="user_input" />
<input type="submit" />
</form>
echo $_POST['user_input];