How to block the tor network?

Question

PHP

<?php
$hostname = gethostbyaddr($_SERVER['HTTP_CF_CONNECTING_IP']);
if ($hostname == ' tor ') {print "You don't have permission!";exit;}
?>
Where is the error here? I need it to block if the hostname contains the word tor
. If you write the hostname in full, then it blocks, but I need it a little differently as I wrote earlier.

Answer 1

<?php
$string = gethostbyaddr($_SERVER['HTTP_CF_CONNECTING_IP']);
if(stristr($string, 'tor')) {echo 'Tor network is blocked';exit;}
?>
Working php script.
HTTP_CF_CONNECTING_IP this is used because site is proxied through cloudflare.com

Answer 2

The error is that you are checking for an exact match, not for a substring within a string. In Google and search - "php search for a substring in a string."

Answer 3

php.net/manual/en/function.stripos.php