Getting value using POST output error

Question

<?php

//Get the value of username

$u = $_POST['username'];

echo $u.'<br />';

//Get the value of pwd

$password = $_POST['pwd'];

echo $password;

?>

Answer 1

Whether to use post mode to transmit? Whether the value of the input tag name attribute is username, pwd, <input type="text" name="pwd">

Answer 2

You have to act on this file in your html

Answer 3

Where did the parameters come from? Alas... I won’t even ask the question