Remembering users logIN time

I would like to store that information of user longterm, which would be in a database or log file on Server.
I have code to do this, but do not know how to store information on server.
Please help. ?

[code=php]
if ( $_SESSION[‘last_page’] != $_SERVER[‘PHP_SELF’] ) {

$current_time= date(“Y-m-d H:i:s”, mktime(date(“h”), date(“i”), date(“s”), date(“n”), date(“j”), date(“Y”)));

$time_looking_at_last_page = $current_time – $_SESSION[‘last_visited_time’];

//*How to have function which logs this info somewhere longterm – HELP PLEASE?

logViewTime($user,$_SERVER[‘PHP_SELF’],$time_looking_at_last_page);

$_SESSION[‘last_page’] = $_SERVER[‘PHP_SELF’];
$_SESSION[‘last_visited_time’] = $current_time
}

[/code]

Also in #PHP _↴