strpos($_SERVER['HTTP_USER_AGENT'], 'VisBot/2.0') !== false ||
strpos($_SERVER['HTTP_USER_AGENT'], 'Netluchs/Nutch-1.0') !== false ||
strpos($_SERVER['HTTP_USER_AGENT'], 'Yanga WorldSearch Bot') !== false ||
strpos($_SERVER['HTTP_USER_AGENT'], 'VisBot/2.0') !== false ||
strpos($_SERVER['HTTP_USER_AGENT'], 'Netluchs/Nutch-1.0') !== false ||
strpos($_SERVER['HTTP_USER_AGENT'], 'Yanga WorldSearch Bot') !== false ||