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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！B3iRb Q"Ks_B
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。CaK eDO
首先我创建MYSQL数据库表。sW*zP5W"~4N8C.F"g
CREATE TABLE tablename (VRq;e#^)FJOW
field type(max_length) DEFAULT 'default_value' (NOT) NULL
5jx7rF5{/i1? H }可以使用的SQL语句。 Zv `-QLs(}
CREATE TABLE useronline (
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@ timestamp int(15) DEFAULT '0' NOT NULL,{%eTL4jv
ip varchar(40) NOT NULL,5W-LPkF;y J
file varchar(100) NOT NULL,
3}O D*Pd!S^"} PRIMARY KEY (timestamp),1a"gCj i"Aw
KEY ip (ip),,h[/mw*R)t
KEY file (file)m'_)H(sq du
);下面我们是PHP脚本，首先我定义MYSQL的信息。 c%z*|
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$server = "localhost"; //你的服务器 dyLN-_Hn
$db_user = "root"; //你的mysql的用户名f/z"iz;c
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$db_pass = "password"; //你的mysql的密码
OE!jgx $database = "users"; //表的名字设置统计的时间(多少秒内在线人数)
YYs5SXt $timeoutseconds = 300;取当前时间。?#JZQ-Pf
$timestamp = time();上面的完整代码：
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[!niap7I H9j <?php
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H `S|[0sR*P $server = "localhost"; //your server.MyEf|%j S\3?V
$db_user = "root"; //your mysql database username
6@1vy#~;D3HZn-n $db_pass = "password"; //your mysql database password if anya-K4w]%v0w0w
$database = "users"; //the db name,ef0Oh|0I/k8e ~
$timeoutseconds = 300;//timeoutseconds limit
5nT/p6P;e9Q!^n^ //get the current time"j
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$timestamp = time();$z T,OTya3K
//calculate the lowest timestamp allowed
1q?;[*L;w2v $timeout = $timestamp-$timeoutseconds;
|0G+W-]7]
E(a$x ?>连接mysql
!an5Cuv d t mysql_connect('localhost', 'username', 'password');也允许使用变量形式。
,W^F y7T d:^3W mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接z e7g P%t Ih%P
mysql_connect($server, $db_user);查询数据库的代码：
x-k;Ud}3h,C;G5S mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。vL~5obni:ug)[
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES%?8NxYh!`V9K[T
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
p5?_$RR5w 如果用户用错误信息的话，这样处理。
H(l@Y;Bo if(!($insert)) {x%p ^v g8Hy
print "Useronline Insert Failed > ";
oB8u,v+]3k[ }然后实现当超过设置的时间就删除该用户记录。
^!os1H:pCf $delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。oL |9u
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if(!($delete)) {'f(Y1QZ}@0i
print "Useronline Delete Failed > ";
S%RP3\;g$m }下面我们解决数据库中不同IP的问题'S:LeFsr~c"vTFM
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用
(nZ8tuuf%mV mysql_num_rows(query);来统计用户，代码如下。#B,~ ?`|}
$user = mysql_num_rows($result);最后关闭数据库。
a8@jP"_ mysql_close();显示在线的人数。:TA8IzIC?2w-^
if($user == 1) {[\Aul kQu
print("1 user online\n");
e0twQ2?;[D } else {
'A:XayS+~n2E(d print("$user users online\n");
\'Z"B^,Vra#m'G*a }最终把上面代码写成一个PHP文件如下。v9Q zR3x5m A1s
<?phpaPb8Vc$p0t
//Put your basic server info here
`UXi+M1Jc2C,m1jI $server = "localhost"; //normally localhost
'lw7K)PX8sK $db_user = "root"; //your MySQL database usernameq$}&Q!_*Y
$db_pass = "password"; //your MySQL database password
t1@`j&`/J%Ji8d-M $database = "users";
s*SOFi $timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably are y8{!u'W"b\D8Wtq7U
// offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the lastFmn^f:y7?'B
// $timeoutseconds seconds)wjS9Op
//this is where PHP gets the time
9SLAG y k5XPk $timestamp = time();
;]8jh1G3a //counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed
*wI5L;i;ZtAG}I $timeout = $timestamp-$timeoutseconds;
:[/z(qh-G&uS`"i3\p //connect to database~;o?+K9@.Y,?
mysql_connect($server, $db_user);^q%{6Y:dD
//add the timestamp from the user to the online list
|,F2D+u;{-X C $insert = mysql_db_query($database, "INSERT INTO useronline VALUES
nM0[:Q'vg5n\Hw^} ('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");%Hg`7[$CM
if(!($insert)) {;swLH-Mf G{U a0Y:}
print "Useronline Insert Failed > ";
,LJ7PM I }
g jhr)b;f ^2A U //delete the peoples which haven't been online/active in the last $timeoutseconds seconds.q#G3bqNx+VUK
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");:l6`:aE1Z-|#K
if(!($delete)) {A ] \l3[zd6]1x H
print "Useronline Delete Failed > ";(z'A2v+y%pb/e$WC EW'H
}
WBX5s/u} j //select the amount of people online, all uniques, which are online on THIS page^5M|-F;S}3gGh
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");,vx H3EP
if(!($result)) {1q%X]KiZM3f.O
print "Useronline Select Error > ";Zc#il]1Y} d
}1b}{KC#j[_
//Count the number of rows = the number of people online6|j*kEw!PoF`,^z
$user = mysql_num_rows($result);
Mu q;Q!h(Tk.X6ne //spit out the results6a!e8V4c)eR
mysql_close();?@,c[$x v
if($user == 1) {
,LM"W5g;m print("1 user online\n");
2v%f)XZu-fY } else {k-Y*Da{G'o"V
print("$user users online\n"); N-}X8]%Y,oz
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}

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9Uc@oV6Vpe 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。0Y+D:YB\
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。
R,a Kvm/q9n R 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。
Y8}]]|6g~P 当然啦，这两款主机也是相当不错的。{(H
R YW)?)O5yD.OD
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rwF;D(t;d$ZBx-b5m^
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@ w:Oj4B!n
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]
"\K1n/\%em:Fd 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]QwjCl*`9B,Wc
自己加QQ去问吧。

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