How to disable links in PHP?

Question

PHP

The site has a feedback form, there is a code for processing it:

<?php
$name = $_REQUEST['name'];
$email = $_REQUEST['email'];
$message = $_REQUEST['message'];
$headers= "MIME-Version: 1.0\r\n";
$headers .= "Content-type: text/html;charset=utf-8 \r\n";
$headers .= "From: От кого письмо <[email protected]>\r\n";

$sub = "У тебя новая заявка";
$message = "<p><strong>Имя:</strong> $name</p>
<p><strong>Email:</strong> $email</p>
<p><strong>Сообщение:</strong> $message</p>"; 
 $send = mail( "[email protected]", $sub,
 $message, $headers );
 header( "Location: thanks.html");
?>

How to forbid entering links in the message field? You need to put the php request in the php. Need protection from advertisers.

Answer 1

filter.filters.sanitize.php