echo $REMOTE_ADDR;

echo $HTTP_USER_AGENT;

echo $HTTP_REFERER;

perche mi danno errore?

Notice: Undefined variable: REMOTE_ADDR in H:\webs\001095\info_2.php on line 2

Notice: Undefined variable: HTTP_USER_AGENT in H:\webs\001095\info_2.php on line 4

Notice: Undefined variable: HTTP_REFERER in H:\webs\001095\info_2.php on line 6