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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！
M/v*ERP2EL:V+t 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。
#Ikx/hp t3r 首先我创建MYSQL数据库表。
-m-`h.^i CREATE TABLE tablename (
*~jP+K2@0B field type(max_length) DEFAULT 'default_value' (NOT) NULL
&o3zom W&Ih }可以使用的SQL语句。J1QT"Ku:gq7x
CREATE TABLE useronline (
/X9{2I'`o
My#`lf timestamp int(15) DEFAULT '0' NOT NULL,
? S4X3u6?`I ip varchar(40) NOT NULL,
0a8? ^-EpJmWB file varchar(100) NOT NULL,5sOZ6y
?$d5lw3f {
PRIMARY KEY (timestamp),2_W Sm;mm
KEY ip (ip),I1s [Lv~G
KEY file (file)^7a
B6bco |
);下面我们是PHP脚本，首先我定义MYSQL的信息。
*sJU2_E@ $server = "localhost"; //你的服务器
.B+Z3wnPza $db_user = "root"; //你的mysql的用户名l+i'g @Q
$db_pass = "password"; //你的mysql的密码
'F-Z l\K0{_t K $database = "users"; //表的名字设置统计的时间(多少秒内在线人数)
(A4] N&Sxt $timeoutseconds = 300;取当前时间。w@:CFUrM
$timestamp = time();上面的完整代码：
&v%Bw9Bm9E <?php yxo
f$SO
$server = "localhost"; //your serverAr(o?k z?
$db_user = "root"; //your mysql database username3X2y/G{yS1k]
$db_pass = "password"; //your mysql database password if any {*Rx4s ^ p|GF|E
$database = "users"; //the db name
6~r2|!k]+p $timeoutseconds = 300;//timeoutseconds limit~Q_4I?TK+] P
//get the current time!o!oi#?4sh4ct
$timestamp = time();tfvf"v3N+DI$m
//calculate the lowest timestamp allowed

rxGb#U6^N
mOM:a.v $timeout = $timestamp-$timeoutseconds;
:`j,U)qV ?>连接mysql
d u#a
p,g|
oX E mysql_connect('localhost', 'username', 'password');也允许使用变量形式。
hG)JkOui
mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接*b a)i.IO1I'E
mysql_connect($server, $db_user);查询数据库的代码：E!W_l8sf)bC
mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。
sfu6N$Q8S $insert = mysql_db_query($database, "INSERT INTO useronline VALUES
-M1HPe1H%I^} ('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
?)@*qI0t 如果用户用错误信息的话，这样处理。D+G&`yt\6m `2F}
if(!($insert)) {
$d*|{
IV:J print "Useronline Insert Failed > ";!Z lNr%`f ^:w
}然后实现当超过设置的时间就删除该用户记录。
,Xa#S#U^h@ $delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。
*BN9w#UJ if(!($delete)) {
w,vmh4j*E
print "Useronline Delete Failed > ";QvK1\wQee1oH.~
}下面我们解决数据库中不同IP的问题lQ!ET&i3cT{V Y
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用a:T$TJ}_0nVA)xE&`
mysql_num_rows(query);来统计用户，代码如下。
PIRM7y@ xJ $user = mysql_num_rows($result);最后关闭数据库。
4K"qiu&Ts1MqO mysql_close();显示在线的人数。
LB9k,D(q if($user == 1) {
0Uh7Z3D\i(PQ print("1 user online\n");
cZPu$s%xlht(MK w,e } else {
%^Xw]+G9AAv print("$user users online\n");.V6gp;_2WonY
}最终把上面代码写成一个PHP文件如下。
'kTB!J&v$o <?php
`.Qj{/SY| //Put your basic server info here:`QL
yXD1Qt
$server = "localhost"; //normally localhost2Bi1S_C7^C`8W,SDU
$db_user = "root"; //your MySQL database username
(a b
H!R3l J $db_pass = "password"; //your MySQL database passwordD(TEa9k7S@
$database = "users";
CFy`x)d#lf $timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably aremN%e qym[9}
// offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last
0D(jFa z@ l // $timeoutseconds seconds)
8k.Wv*e[
JsBkf //this is where PHP gets the timeDDx4N7}A
$timestamp = time();p.s|X^I
//counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed
5Ai1Br4IeAN;n $timeout = $timestamp-$timeoutseconds;)YEGE]8{#M$vRKfnC
//connect to database
za1Py)F mysql_connect($server, $db_user);
$FuP3MfL //add the timestamp from the user to the online list
Zy%bP2du!d*}Lj $insert = mysql_db_query($database, "INSERT INTO useronline VALUESAL0a QZ
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
$Kjh+V)z if(!($insert)) {
'B{1v6U}2h,L,g print "Useronline Insert Failed > ";!mAi6F]7hD(de_.ol
} { L|(Mi@i
//delete the peoples which haven't been online/active in the last $timeoutseconds seconds.7Fh[w:L _)sT?*y
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");S!A.lad4B-rt
if(!($delete)) {
B-ds-n y print "Useronline Delete Failed > ";
w$Pw UD*v
U-D }
4{TWv)?8F;yoV!{ //select the amount of people online, all uniques, which are online on THIS page
uX9cr;dD\ $result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");
|#z|gE.M8C if(!($result)) {(\3])g J9V-n
print "Useronline Select Error > ";
+g5axCz$Gjjy }6uz;i Af)i
//Count the number of rows = the number of people online4k X,^5@ ~K&H7}4b
$user = mysql_num_rows($result);
iiC)ZY3r2s9p,i9l //spit out the results
"D:y/j!AcZ mysql_close();'d @cd&u MJ
if($user == 1) {,{*DzNMg
print("1 user online\n");XVu MI6E$V
} else {
f x&tw*n4x print("$user users online\n");
#n3U]p%d }
h4@@z)xl9\T ?>Bm,q7t[ b
[url=http://www.now.cn/vhost/][img]http://b.todayisp.com/bbs/760x90h.gif[/img][/url]!V!PBC$H0[]
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。,nq1iP*`dJb
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。
7s|3WU8J+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。
qhI(xl c4H&Vy 当然啦，这两款主机也是相当不错的。
eIO [*x 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
cQz({(uon+m 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,tcw;V%gl
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]
(q$NC+C8GS*y 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]
(YM6lpF&YAm*j 自己加QQ去问吧。

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