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Obtaining IP and host of visitor

/ Published in: PHP
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This piece of code is at least ten years old and I don't remember exactly, where I have found it. Probably it had been stolen from my friend VeZyR;)

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  1. $ip=NULL; $host = '';
  2. if( isset($_SERVER["HTTP_X_FORWARDED_FOR"]) ) $ip=$_SERVER["HTTP_X_FORWARDED_FOR"];
  3. if( $ip==NULL && isset($_SERVER["REMOTE_ADDR"]) ) $ip = $_SERVER["REMOTE_ADDR"];
  4. else
  5. {
  6. 	$ip_tab = explode(".", $ip);
  7. 	if($ip_tab[0]=="192" && $ip_tab[1]=="168") $ip = $_SERVER["REMOTE_ADDR"];
  8. }
  9. if($ip!=null) $host = gethostbyaddr($ip);
  10. else $ip = false;

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