Fatal error: Call to undefined function session_register() - repost

Have placed website with another host and placed all correct usernames and passwords in correctly but cannot connect to datababse and get following error: Fatal error: Call to undefined function session_register() The old SQL datababse was running PHP 3.5.8.1 and new version is 4.08 with new hosting provider Please see following file that has problem <? Error_Reporting(E_ALL & ~E_NOTICE); unset($l); session_start(); session_register($l); include ("includes/[login to view URL]"); include ("[login to view URL]"); include ("includes/[login to view URL]"); // CHECK AND UPDATE TRAFFIC STATS $date=date("d/m/y"); $user_ip_address = $HTTP_SERVER_VARS["REMOTE_ADDR"]; /*Fetch the user's IP Address */ $traffic_stats=mysql_fetch_array(mysql_query("select * from jsgamingcenter_traffic WHERE date='$date'", $casdb)); if ($traffic_stats[1]!=$date){ mysql_query("INSERT INTO `jsgamingcenter_traffic` VALUES('', '$date', '0', '0')", $casdb); } $tuserip=mysql_fetch_array(mysql_query("select * from jsgamingcenter_users WHERE ip_reg='$user_ip_address'", $casdb)); if ($tuserip[ip_reg]==$user_ip_address){ mysql_query("UPDATE jsgamingcenter_traffic set visitors_re=visitors_re+'1' where date='$date'", $casdb); } if ($tuserip[ip_reg]!=$user_ip_address){ mysql_query("UPDATE jsgamingcenter_traffic set visitors_new=visitors_new+'1' where date='$date'", $casdb); } /*********************************************************************** Check if user is logged on and display the appropriate page ************************************************************************/ if($page=="" or $page==" "){ header("Location: [login to view URL]"); } if($page!="" && $page!=" "){ if(!isset($l)){ include ("templates/template_$[login to view URL]"); } else{ include ("templates/template_$[login to view URL]"); } } ?>