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תÌù×Ô:http://www.webwoo.net/PHP/PHPshili/200902/06-31148.html 
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include "class/config.inc.php"; //°ÑÅäÖÃÎļþ°üº¬½øÀ´
$db = new db;
$db-> db_connect( ); //Á¬½ÓÊý¾Ý¿â
$user = new user; //³õʼ»¯
$session = new session;
//Æô¶¯»á»°
session_start();
//ɾ³ýsession±íÖÐÒѾ­¹ýÆÚµÄÓû§£¨¼´·ÇÔÚÏßÍøÓÑ£©ÒòΪ´ËÎļþ×ÜÊDZ»µ÷ÓôӶø±£Ö¤ÏÔʾµÄ¶¼Êǵ±Ç°ÔÚÏßµÄÓû§
$curtime=time();
$con="lastactivity<$curtime";
$session->del($con);
//ÕýÔÚÏßµÄÍøÓÑÐè²»¶Ï¸üÐÂsession±íÖеÄlastactivityʱ¼ä,²¢ÖØÐÂÉèÖÃÓû§µÄCOOKIES
if ($HTTP_SESSION_VARS["online"]=="on"){ //´Ë´¦Ò²¿ÉÓÃ$_SESSION[“online”]
$userid=$HTTP_SESSION_VARS["userid"]; //È¡µ±Ç°ÔÚÏßÓû§µÄuserid
$ipaddress=substr($REMOTE_ADDR,0,50);
$lastactivity=time() 3600; //¸üÐÂ×îºó»î¶¯Ê±¼ä£¬Èçʱһ¸öСʱ֮ÄÚδµ÷¶¯Ò³Ãæ¾ÍÈÏΪÓû§ÒÑÀëÏߣ¬´Ó¶ø»á±»É¾³ý¡£
$session->update($userid,$ipaddress,$lastactivity);
}else{
//Èç¹ûδµÇ¼ÄÇÖ±½ÓתÈëµÇ¼ҳÃæ
$firstpage="logon.php";
header ("Location: $firstpage");
exit;
}
insert($userid,$ipaddress,$lastactivity) °ÑµÇ¼³É¹¦µÄÓû§²åÈëµ½±íÖÐ
update($userid,$ipaddress,$lastactivity)¸üÐÂÔÚÏßÓû§×îºó»î¶¯Ê±¼ä
del($con)ɾ³ýÂú×ãÌõ¼þµÄÓû§£¬ÓÃËüÀ´Çå³ýÀëÏßÓû§
get_from_condition($con) ·µ»ØÂú×ã²éѯÌõ¼þµÄ¼Ç¼¼¯
if ($hiddenField=="0"){ //²â¼ì±íµ¥ÓÐδ±»Ìá½»
$con="username='$username' and userpwd='$userpwd'";
$result=$user->get_from_condition($con);
if ($user->counter==1){
if (!session_is_registered("online")){//¼ì²âÊÇ·ñ±»µÇ¼Ç¹ý
session_register("online"); //µÇ¼ÇÒ»¸öеıäÁ¿Îª»á»°±äÁ¿
}
if (!session_is_registered("ccauser")){
session_register("ccauser");
}
if (!session_is_registered("userid")){
session_register("userid");
}
$ccauser=$username; //¸ø»á»°±äÁ¿¸³Öµ
$online="on"; //Õâ¸ö±äÁ¿ÔÚglobal.phpÓõ½ÒÔ¸üÐÂ×îºó»î¶¯Ê±¼älastactivity
$userid=$user->userid;
$ipaddress=substr($REMOTE_ADDR,0,50);
$lastactivity=time() 3600;
$con=" userid=$userid";
$session->get_from_condition($con);
//ÅжϻỰÊÇ·ñ´æÔÚ£¬ÓпÉÄÜÄãÔÚ²»Í¬µÄ»úÆ÷ÉϵÇÁ½´Î¡£
if ($session->counte