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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！5y#sMb0S Ww
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。T U q7c]e@,ak3P+x
首先我创建MYSQL数据库表。;v_4smVqNB8}
CREATE TABLE tablename (.\2{s&ty M&bf+Bs
field type(max_length) DEFAULT 'default_value' (NOT) NULL
A.H.G(L n-}#d Z }可以使用的SQL语句。-W&Q%rdbC
CREATE TABLE useronline (
i5nF Rs?3A'fX timestamp int(15) DEFAULT '0' NOT NULL,
3oI9Rh&r2X*E j$j ip varchar(40) NOT NULL,
X2P!B pJA file varchar(100) NOT NULL,
TZ/Z
ZD+_:W PRIMARY KEY (timestamp),
!R+t-xcy \vl KEY ip (ip),
AiD6e5LjN0\Fc)J;v V KEY file (file)
])yh.U2U5|.A n );下面我们是PHP脚本，首先我定义MYSQL的信息。
[1IK6Prv $server = "localhost"; //你的服务器6ljM7Un
$db_user = "root"; //你的mysql的用户名
hi\h
LK ?-g $db_pass = "password"; //你的mysql的密码
N,`V2p/Ok P6} $database = "users"; //表的名字设置统计的时间(多少秒内在线人数)
9Y!z4FB3h-Ix $timeoutseconds = 300;取当前时间。
'GA2^8vkzI(dH Vez $timestamp = time();上面的完整代码：b u#[9]W-i?
<?php
`l1o!Nm+L)k$C $server = "localhost"; //your serverprsDp+c`7K4U
$db_user = "root"; //your mysql database username7e}k5Y#ZM1O1xL1BW
$db_pass = "password"; //your mysql database password if any
|lXG6W4ldiH $database = "users"; //the db name
)J:j3t9J!_
Oh8w $timeoutseconds = 300;//timeoutseconds limit6tn8ssjHMY
//get the current time-|-|Kf:}:bw;Bj0U$X
$timestamp = time();3E)`{3A2_ A.hN!OH+zd
//calculate the lowest timestamp allowed T,s]?|c
$timeout = $timestamp-$timeoutseconds;I\/|&u i)qd|BH
?>连接mysql
!d9QL%ps mysql_connect('localhost', 'username', 'password');也允许使用变量形式。V!H%kC1N3J/Z)gtV_ Y"v
mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接
)DP1f(zIf%N mysql_connect($server, $db_user);查询数据库的代码：
'v6Lm$Jo3t+eI7d;K
] mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。a]%~4Zr
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES
p6I})]/C]C ('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
J1o8GJ,u7l i!ru4r+pk 如果用户用错误信息的话，这样处理。
6UksK!Lw e if(!($insert)) {
!H+x#\&p!I] print "Useronline Insert Failed > ";"[RMZ$U
s)L^7U+T3A
}然后实现当超过设置的时间就删除该用户记录。+F.|]&g8N.e
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。z?:n$L"K a G;t\
if(!($delete)) {ff ~8xe_)T
print "Useronline Delete Failed > ";
!g khbw!DL1ez }下面我们解决数据库中不同IP的问题
1`AIdB3P+b'EJT $result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用
rMN&M X-t mysql_num_rows(query);来统计用户，代码如下。
#S9y3lPc $user = mysql_num_rows($result);最后关闭数据库。8I | B'kh9E
mysql_close();显示在线的人数。5o'Cq2EV1I L
if($user == 1) {
I5ac
B} print("1 user online\n");BdD mnUr~ m6w2i
} else {0gt3V%{a4X X8Oh
print("$user users online\n");
$FI's~.Y
|z }最终把上面代码写成一个PHP文件如下。
3](g0I.M5~ <?php @ F&pcZm5ZP
//Put your basic server info hereQ/@`"Tc:m(x
$server = "localhost"; //normally localhostu)D5qf
$db_user = "root"; //your MySQL database usernameBX!N0@w+Sb2cd
$db_pass = "password"; //your MySQL database password
A{PBw-mb$\zr $database = "users"; R%PMv.d6Vgp"^/C@
$timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably are
0Sk*EF,Fj$g6Z4A // offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last
:KTcOt-~ Jm:@IC.j // $timeoutseconds seconds)
h9vvsD[3@%c //this is where PHP gets the time
I+[vO2vy] $timestamp = time();|I\J'L_
//counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removeduKN)ic@&Vt
$timeout = $timestamp-$timeoutseconds;9E+se [l8b
Q
//connect to databaser%v6mdMY
mysql_connect($server, $db_user);
#~rg)i?!s1F //add the timestamp from the user to the online list/J&}P(_QP
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES
.\i%B2L,To ('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
vd1fk2IW,a if(!($insert)) {
D }7eWRrr print "Useronline Insert Failed > ";
6Z9M&`D??|0W{fR R }&]Y,lW$af
//delete the peoples which haven't been online/active in the last $timeoutseconds seconds. Oloym K
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");ir~8P9|$FY|
if(!($delete)) {
{f6Ax0B9b9E print "Useronline Delete Failed > ";
/@&Gei M$u"q }h4{ ukW0{k7bw[
//select the amount of people online, all uniques, which are online on THIS page%@ZZ0j-w
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");9]8c.}8j&c
if(!($result)) {
qf&D*VFR6Bf print "Useronline Select Error > ";
F%o4l6S
^ }{B;@9b%yF&D4V{f
//Count the number of rows = the number of people onlinej?#pFy/dsf
$user = mysql_num_rows($result);
XD\eXo-D //spit out the results
P/TwOp
mysql_close();0`r8Q A@o eq T
if($user == 1) {
-C#V:v+mng/} print("1 user online\n");
H1oq pw&\!?{Er[ } else {&G}`h]7a+Ns1h
print("$user users online\n");
z,^g/mk_ };e.H-@Fr1K!Gb
?>
.vH!^dU2~6L!h~I [url=http://www.now.cn/vhost/][img]http://b.todayisp.com/bbs/760x90h.gif[/img][/url]
"f.[](hDB7[ 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。x"y3U5E7w0@3Q
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。
]2F%]+e'N 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。
no3gZ?1n 当然啦，这两款主机也是相当不错的。
F2sz ldURbanQ 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$S{(f? b&C T
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*Ve_*KHy}
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] \l6f P2_v;I
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]
BPQ.n-~ 自己加QQ去问吧。

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