Why is the variable not being written?

Question

PHP

The form has fields. All names are transmitted and sent by post, but only Static lines come.

<?php
header('Content-Type: text/html; charset=utf-8');
$headers .= 'Content-type: text/html; charset=utf-8' . "\r\n";

$name=  $_POST["name"];
$tel = $_POST["tel"];
$mail = $_POST["mail"];
$city = $_POST["city"];
$comment = $_POST["comment"];
$message="
Имя:".$name."<br>
Тел:".$tel."<br>
Почта:".$mail."<br>
Город:".$city."<br>
Комментарий:".$comment."<br>

";
mail("[email protected]","Обратная связь",$message,$headers);     	  ?>

Why are empty variables coming?

Answer 1

\print_r($_POST) what output?

Answer 2

$name= $_REQUEST["name"];
etc.

Answer 3

so or
$name= $_GET["name"];