if (isset($_SERVER['HTTP_X_REQUESTED_WITH']) && strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) === 'xmlhttprequest')
{
echo "b";
}
else { 

$ip = $_SERVER['REMOTE_ADDR']; 
		$bandosyasi= 'ban.txt';
		$contents = file_get_contents($bandosyasi, TRUE) 
          OR exit('Unable to open file');
 		$exists = !stripos($contents, $ip) 
          OR exit();
  		  $ban .= "{$ip}\n";
		file_put_contents($bandosyasi, $ban, FILE_APPEND) 
		  OR exit('Cannot append rule to file');

	

}