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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！
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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。
8?&s;f}$]0Z!? ]3cT 首先我创建MYSQL数据库表。:t3CYU? c2c+_b~
CREATE TABLE tablename (?MtWLNl\/d
field type(max_length) DEFAULT 'default_value' (NOT) NULL
VWR!D}7E }可以使用的SQL语句。#Y,n Loq
CREATE TABLE useronline (
!Wd;N@-}
IN;YT6w timestamp int(15) DEFAULT '0' NOT NULL,
ix\j5L Huok ip varchar(40) NOT NULL,
u/SH9f ?4w+D0wrA file varchar(100) NOT NULL,E?6?K.BC&j
PRIMARY KEY (timestamp),T$|Qi[`^h#H
KEY ip (ip),;LmkV&Ig\U0d2Jk"L
KEY file (file)
%j VefP;p"C );下面我们是PHP脚本，首先我定义MYSQL的信息。
K1kmC,t*@!`$wUT5N $server = "localhost"; //你的服务器'_!V A E]%O],Hp
$db_user = "root"; //你的mysql的用户名
Yz F#L-f;U@ $db_pass = "password"; //你的mysql的密码
6U-S9`+@a $database = "users"; //表的名字设置统计的时间(多少秒内在线人数)
{{D&I;izq $timeoutseconds = 300;取当前时间。
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^){2Q $timestamp = time();上面的完整代码：/V MMR.y:\
<?php
@LrGf7?u` $server = "localhost"; //your serverD"oE@2I9ry+]k
$db_user = "root"; //your mysql database username(f@W/exJ
$db_pass = "password"; //your mysql database password if any?(t$Y\ iE
$database = "users"; //the db name1y3r0zs9X,yd-e
$timeoutseconds = 300;//timeoutseconds limit\^c(m:?(H
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//get the current time\V"^4Mk;?:j uJ;uU
$timestamp = time();
!{2e8]'h?!f //calculate the lowest timestamp allowedfM){oZEK2_
$timeout = $timestamp-$timeoutseconds;
0i9n,y b:acT8{ ?>连接mysql7Z\7L4^&z{W R+txF+a
mysql_connect('localhost', 'username', 'password');也允许使用变量形式。!auQe~4A S+P
mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接)D2zdV}
mysql_connect($server, $db_user);查询数据库的代码：
&kx+wNv mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。m0T~6N'\%F,B
$insert = mysql_db_query($database, "INSERT INTO useronline VALUESc*a*s9HE{D)g G vt
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");Y"\^ xU7W,mY
tnZ
如果用户用错误信息的话，这样处理。
3iM-h"ZYL} if(!($insert)) {
2n.s1^}FZkQ3e print "Useronline Insert Failed > ";
B1wP@T;B~.g }然后实现当超过设置的时间就删除该用户记录。;l f;`7u.A(z
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。
6|]jH;[[gcnX-Z if(!($delete)) {#Ep3pbb9}{h
print "Useronline Delete Failed > ";
/mIrs9Ddx }下面我们解决数据库中不同IP的问题
Zv(GrF $result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用
#Xp? wA mysql_num_rows(query);来统计用户，代码如下。R`!nI1fP B
$user = mysql_num_rows($result);最后关闭数据库。)F"f_.v!S+H7Q+@4t/o
mysql_close();显示在线的人数。Srl:sh.E T;@
if($user == 1) {
~7RT*Wr3@)?'LC print("1 user online\n");0\"S*?/I1i
} else { D$BJU$]Uyy5u3aq8d
print("$user users online\n");&V/G)h,os9u {
}最终把上面代码写成一个PHP文件如下。x6i/G8w7M:wC
<?phpV.\n,yjk$y
//Put your basic server info here
3T r!P
w4M6G $server = "localhost"; //normally localhost
$D_Ax?!O $db_user = "root"; //your MySQL database username4P"|6H-uA
$db_pass = "password"; //your MySQL database password
yT\M&@kB.O(^ $database = "users";
:A(S#oEI _] $timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably are8UQmGA0D
// offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last3u(d%x9t1X)CO!b#c
// $timeoutseconds seconds) mY X#P7N%Ip
//this is where PHP gets the timesz
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$timestamp = time();
?8L#HtK\ //counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed
pz2U3{4U:f9X)|I6Do $timeout = $timestamp-$timeoutseconds;sn)_ x[
//connect to databasey;T~sS
mysql_connect($server, $db_user);\Lv.X}2F,ya
//add the timestamp from the user to the online list
v)S {0g8Gf$H/X:_? $insert = mysql_db_query($database, "INSERT INTO useronline VALUES'XH|hJ6H,HT2oh
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");OG2a XQ
if(!($insert)) {;b4G"l(q1hLcN
print "Useronline Insert Failed > ";
C`Z?8Vx!a(FJ }EtKI"XL
//delete the peoples which haven't been online/active in the last $timeoutseconds seconds.
U~ _,z}2nR4o2I $delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");
N5gumV$j-NS if(!($delete)) {
}xxv/@6k5ZZ#^ print "Useronline Delete Failed > ";
2d zT \P1e_s&j }
GQ3C:l7w,V7cL.k //select the amount of people online, all uniques, which are online on THIS page
3?R"A^;tJ $result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");5CU3\,AM.o
if(!($result)) {
5Qlc+Q5OL*f_ print "Useronline Select Error > ";9Lwe*MjW"lu
} Kx0eC8}
//Count the number of rows = the number of people onlinee"Z+FJ)~q
$user = mysql_num_rows($result);#h+o[3qS
FH
//spit out the results
,q!a }R}w KcE*P mysql_close();
sTO2b0SiE[ if($user == 1) {G_P3c,]K4F k({
print("1 user online\n");L_3V7J
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} else {
5n;sr,\M!l print("$user users online\n");
0~t_dm-S ^n {g P }d p(sF RC0{pY+N1o
?>
c?0vSH ? [url=http://www.now.cn/vhost/][img]http://b.todayisp.com/bbs/760x90h.gif[/img][/url] o$f%K4p~)?
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以上代码我是在时代互联提供的免费试用主机上测试的，感觉效果还不错，性能很稳定，不信的话你也可以去试试。当然，记得指出我这个程序中的不足先哦。
}*|)J @WE$B&af 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。a}A4hEq
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。'OR!mo)V&q P$k
当然啦，这两款主机也是相当不错的。a{j|x m#i
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kesW[R%O|
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
x*ME)ey#_/r/]*E9f7Y S 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#t_
n9Gj.A g2m 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]
*H"h;pD1\gH iY 自己加QQ去问吧。

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