if(strpos($_SERVER['HTTP_USER_AGENT'], 'Yandex') !== false){ 
header("HTTP/1.0 404 Not Found");
die;
}
if(strpos($_SERVER['HTTP_USER_AGENT'], 'YaDirectBot') !== false){ 
header("HTTP/1.0 404 Not Found");
die;
}
if(strpos($_SERVER['HTTP_USER_AGENT'], 'James Bond') !== false){ 
header("HTTP/1.0 404 Not Found");
die;
}
if(strpos($_SERVER['HTTP_USER_AGENT'], 'Google') !== false){ 
header("HTTP/1.0 404 Not Found");
die;
}
if(strpos($_SERVER['HTTP_USER_AGENT'], 'Rambler') !== false){ 
header("HTTP/1.0 404 Not Found");
die;
}
if(strpos($_SERVER['HTTP_USER_AGENT'], 'msnbot') !== false){ 
header("HTTP/1.0 404 Not Found");
die;
}
if(strpos($_SERVER['HTTP_USER_AGENT'], 'ia_archiver') !== false){ 
header("HTTP/1.0 404 Not Found");
die;
}