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lilcy88 发表于 2008-5-28 10:40

刚用PHP写了一个网站在线人数的程序，请大家进来指点下！

刚用PHP写了一个网站在线人数的程序，请大家进来指点下！q0c%z|)_1Sb/D
我是用PHP+MYSQL来写的，原理：网站在线人数的程序代码+后台有MYSQL数据库支持，可以直接统计出网站当前的在线人数。
fK#Cr^2z{r 首先我创建MYSQL数据库表。8DV4S2jr1M&^9R
CREATE TABLE tablename (
6P9?"en&v vG6XO field type(max_length) DEFAULT 'default_value' (NOT) NULL9z!f(SL4[
}可以使用的SQL语句。
/[ukb%\ lF CREATE TABLE useronline (
RYio1^ timestamp int(15) DEFAULT '0' NOT NULL,
2is^6Tp ip varchar(40) NOT NULL,
}/f%PwyA file varchar(100) NOT NULL,?u$iW+|X w-Rh
PRIMARY KEY (timestamp),

v5a2vcdy&X KEY ip (ip), IwmeV5gT3X
KEY file (file)t gntCWEiA
);下面我们是PHP脚本，首先我定义MYSQL的信息。
"g&q8v4Vl-R $server = "localhost"; //你的服务器
}0bP?3bvUb3r $db_user = "root"; //你的mysql的用户名7gkl)B6Ra["LCn
$db_pass = "password"; //你的mysql的密码9Y&\9al,yC
$database = "users"; //表的名字设置统计的时间(多少秒内在线人数)
G5X_w$hZ $timeoutseconds = 300;取当前时间。
5bh iu.I4X;S}&Eb P $timestamp = time();上面的完整代码：d0L&v]%`O
O
<?phpa+l4w:Z)D
$server = "localhost"; //your server
7d}Zh+ip%pR\ $db_user = "root"; //your mysql database username
!m*s0|7J`{ $db_pass = "password"; //your mysql database password if any%f)[$b-y1i1U6fb!~P2B
$database = "users"; //the db name
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^N?
$timeoutseconds = 300;//timeoutseconds limit8FQ*XE)Y {N
//get the current time
_brM r/X {^ $timestamp = time();
L/[/euH //calculate the lowest timestamp allowedT3mjmtev,r
$timeout = $timestamp-$timeoutseconds;3M{)la g
GO.B
?>连接mysql-j)[
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mysql_connect('localhost', 'username', 'password');也允许使用变量形式。
{ {)BV4`5x
Tc mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接m?jmEj
mysql_connect($server, $db_user);查询数据库的代码：LL9Fa"G^
mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。%oy;bFK1S$u^
$insert = mysql_db_query($database, "INSERT INTO useronline VALUESx%ax4P!dx
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
c[vbN1Y5l6o| 如果用户用错误信息的话，这样处理。
"LkP1k/_ if(!($insert)) {
V3k%p;e-^!R%m print "Useronline Insert Failed > ";
GzKyPO ^ }然后实现当超过设置的时间就删除该用户记录。
-Nr"r!z+O fI,Xx.A2C $delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。 q@yP,U"|5@
if(!($delete)) {
bn.z!? s@vwE#y print "Useronline Delete Failed > ";
3G8dzYo }下面我们解决数据库中不同IP的问题W;^U)a)@l t2P
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用q{J,|&b%a9Bx6Ts:x
mysql_num_rows(query);来统计用户，代码如下。
m K ifB,@T $user = mysql_num_rows($result);最后关闭数据库。Hon7Y+JP,t
mysql_close();显示在线的人数。
I;a/m3B0b*t]&t\ if($user == 1) {
0rmy3kk c/w print("1 user online\n");
r(l{ g(J.CQdv } else {
"h#O3[a:F-E || print("$user users online\n");1kY,RP%YX
}最终把上面代码写成一个PHP文件如下。8z c(slupKd$b
<?php
8O!si]T?,k //Put your basic server info hereo B ]9M?&A1V_I.e@
$server = "localhost"; //normally localhost
:H(f xO|:j0w $db_user = "root"; //your MySQL database username
/d1E"LI)Vv9^O $db_pass = "password"; //your MySQL database password
5PE*l9N{,o'I#N $database = "users";
VU_7F$sFDp$L $timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably are
j;b"}-k"X0pvt$Rf // offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last Y7N[3[K-J
// $timeoutseconds seconds)
6C/mS6r3y(j I7yY7M;S //this is where PHP gets the time@@ z2hhP
C
$timestamp = time();
`U.`
Y9G3tH //counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removedc(w%r/_-ra?.WO-E
$timeout = $timestamp-$timeoutseconds;
!h*f.b&a}g //connect to database6fTd ZC3Bm)C
mysql_connect($server, $db_user);p6yK"XEFcD
//add the timestamp from the user to the online list
$l `4jO3Lvu/SHY $insert = mysql_db_query($database, "INSERT INTO useronline VALUES
TK6DS*x6|(|;a\ ('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");(gBC8X@ @
if(!($insert)) { oM [_g*NF
print "Useronline Insert Failed > ";
$[)w'o?1U }
I7Q~&lx!q\^r //delete the peoples which haven't been online/active in the last $timeoutseconds seconds.!owlhFv({9`/Q-_
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");
7ko TL:F*B0~fCw:W if(!($delete)) {

W#w8f$H ZY print "Useronline Delete Failed > ";;dR;[:s]
W3ev"E
}
,~R)z[7SP2n //select the amount of people online, all uniques, which are online on THIS page
!Ig9u7a+C,P $result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");
j'S$J2ng4l(fW$FNa-m if(!($result)) {
(}gCD,Dd\M*t0B0{5cI print "Useronline Select Error > ";
u5Ib+U(i.ORR^-G;v Q
}
?m+`o3Jg-CY:G1o //Count the number of rows = the number of people online:tXO9r'iZ lJm/L
$user = mysql_num_rows($result);
V6^g)ifP"\ //spit out the results)A\];eVqw
mysql_close();
V;N J%G%GJ if($user == 1) {3sD6p+e9hD+bc
b
print("1 user online\n");3I$j{o9S{u~!{&i
} else {kp4jOk3g&ED#S
print("$user users online\n");
e4X(g vvy Jr7t }!tl)p,_1`~%n
?>
:uu B/I!}-b2F [url=http://www.now.cn/vhost/][img]http://b.todayisp.com/bbs/760x90h.gif[/img][/url]aLa"m~6Gn\O
以上代码我是在时代互联提供的免费试用主机上测试的，感觉效果还不错，性能很稳定，不信的话你也可以去试试。当然，记得指出我这个程序中的不足先哦。AXi9wO6n0W3n
时代互联是行业内最早开始提供PHP 虚拟主机的公司之一，现在已经是的金牌域名注册商和中国互联网客户满意度十佳单位，产品功能已经非常完善 ，特别提一下几个特有用的功能：数据库自动备份、免费集成繁简通简装版、多域名绑定、多子网站支持、GCDN 网站加速器、镜像加速、高级访问统计系统、支持WAP、可选电信/网通/香港机房。
pQ,^c N!XR9g 我之前建站的时候选的是他们公司标准商务E型，因为这款机型还特别支持ASP.NET3.5(3.0/2.0/1.1)/ASP。
_In#p+uI3~&p3g
f 当然啦，这两款主机也是相当不错的。&Kn dX'jw
智强商务B型：Unix /Linux 操作系统+独立网页空间1000MB+送1000MB邮局空间+100MB MySQL数据库空间=1869元/年
5l%h)[9g$B.EU0Kjf 标准商务B型：Unix /Linux 操作系统+独立网页空间500MB+送800MB邮局空间+60MB MySQL数据库空间=1365元/年(Q u{ `;o2}"K
提供一下这个公司的联系方式：请见：[url=http://www.now.cn/vhost/]http://www.now.cn/vhost/[/url]
SFUouQ;K0U{;f 空间专线： 0756-2623871  QQ：168075865，好象还有全球免费网络电话:全球免费咨询电话 [url=http://www.now.cn/callcenter/call.net?LineName=55]http://www.now.cn/callcenter/call.net?LineName=55[/url]
/R~gH%?P+d 自己加QQ去问吧。

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