append data in a DB field

[denoteone]

$visitor_ip = $_SERVER['REMOTE_ADDR'];

$visitor_day = date("d");

$visitor_page = curPageURL();  //function that gets the page they are visiting.

mysql_select_db($database_visitors, $visitors);

 

//my table is named visitor_list

I would like to do something like the following.

 

    $sql = update 'visitor_list' where visitor_ip and visitor_date are = to $visitor_ip and $visitor_date, append visitor_page with $visitor_page;

$result = mysql_query($sql) or trigger_error(mysql_error(),E_USER_ERROR);

[denoteone]

let me ask this differently.

 

how do I add the to the contents of a database field named "info"  where the field "visitor" and "date" are both equal to $visitor and $date

 

 

 

[The Little Guy]

http://dev.mysql.com/doc/refman/5.0/en/string-functions.html#function_concat