php - Storing User Navigation History in a Cookie/Session -

i'm playing php , looking achieve following (i know possible third party plug-ins, want build on own practice):

1. store history of urls user visits within (joomla driven) site in cookie.
2. send array of values (other user information including url history) source (file or database) when user logs out. have not tackled item 2 yet, answer or pointer appreciated.

the php code i've created far:

$user   = jfactory::getuser(); $helper = juserhelper::getusergroups($user->id);  if(!isset($_cookie['pagehistory'])){     setcookie('pagehistory',$_server['request_uri'].'|'); } else {     $_cookie['pagehistory'] .= $_server['request_uri'].'|'; }  // debug: destroy cookie //setcookie ("pagehistory", "", time() - 3600);  $group  = ""; foreach ($helper $value) {     $group .= $value."|"; }  $userinfo = array( 'id'        => $user->id, 'username'  => $user->username, 'realname'  => $user->name, 'group'     => $group, 'url'       => $_server['request_uri'], 'history'   => $_cookie['pagehistory'], ); 

the issue i'm having 'pagehistory' cookie. when test using console, seem first url , ever-overriding second, no more.

example:

nav url 1: '/' //(root)
nav url 2: '/news'
nav url 3: '/tutorials'

results of cookie code:

round 1 : '/'
round 2 : '/|/news' // '|' being delimiter
round 3 : '/|/tutorials' // instead of '/|/news|/tutorials'

what doing wrong?

cookies created setcookie function. change else following , see if fixes it:

else {     $tmp = $_cookie['pagehistory'] . $_server['request_uri'] . '|';     setcookie('pagehistory', $tmp); }