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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！
&Wg)zj.z2YT 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。
GE:C"B5{ 首先我创建MYSQL数据库表。
.gK-Ym1l7Us CREATE TABLE tablename (evMHM*Gm| j"Y
field type(max_length) DEFAULT 'default_value' (NOT) NULL
kVv.oH }可以使用的SQL语句。
E-Wv QA,\0v7} CREATE TABLE useronline (%HoP,JRB,d
timestamp int(15) DEFAULT '0' NOT NULL,*{:ohAcH
ip varchar(40) NOT NULL,0F&V f%W:vAT
file varchar(100) NOT NULL,
g*Y/Rp/[p5UV PRIMARY KEY (timestamp),~0ma9CI!hf gN
KEY ip (ip),oI`$_"P)zz
KEY file (file)
q_.L(o
[%r/} );下面我们是PHP脚本，首先我定义MYSQL的信息。w/B|,~Jw
$server = "localhost"; //你的服务器;KoK~.e4Vv
$db_user = "root"; //你的mysql的用户名
C5]^2HS g?9z $db_pass = "password"; //你的mysql的密码 O9Y#Yyy.]{{+[(c
$database = "users"; //表的名字设置统计的时间(多少秒内在线人数)3v&Mof.ua
$timeoutseconds = 300;取当前时间。K4@q4Mi
$timestamp = time();上面的完整代码：
PF|z@r <?php6jM1~)cy%Qb
$server = "localhost"; //your server
Lm!` i3w8y9b%Z`;gz $db_user = "root"; //your mysql database usernamenFE%m2X%j;w,x!j/i;v
$db_pass = "password"; //your mysql database password if any
I)r&gB@U)ym @ $database = "users"; //the db name
7@`;s8@u\9ze"]zQ $timeoutseconds = 300;//timeoutseconds limit
R`'Dr(g //get the current time
(P A$]2\|7lT}'y(L(A| $timestamp = time();
*JA@ h7mg //calculate the lowest timestamp allowedc3g"oB+js
$timeout = $timestamp-$timeoutseconds;7m2h#Tz{*nk
?>连接mysql7pahve,rU
mysql_connect('localhost', 'username', 'password');也允许使用变量形式。#^5xn O^#aMZvz
mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接g9D}0^$XF3s1j
mysql_connect($server, $db_user);查询数据库的代码：ze1UKtQ2P
mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。
jD:{u'?ANx $insert = mysql_db_query($database, "INSERT INTO useronline VALUES&^ \+e#a{-I
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");4^4W\X1E(F
如果用户用错误信息的话，这样处理。
yw'tH$B7j2n xd if(!($insert)) {
^T2Q:AtsADE print "Useronline Insert Failed > ";Z'KMh7a_!y"ov
}然后实现当超过设置的时间就删除该用户记录。:`M bf5u%cz I
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。
xzO8m^C0{ if(!($delete)) {3wh.V*v
?;_
print "Useronline Delete Failed > ";-g/Qgy;S+UVz$^1R
}下面我们解决数据库中不同IP的问题
]XG/nv $result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用0U#zRog {$Q FC
mysql_num_rows(query);来统计用户，代码如下。0_5UBR t({k
$user = mysql_num_rows($result);最后关闭数据库。 l B5w4UH;ZP3Xp
mysql_close();显示在线的人数。
I9MtG:N+_ if($user == 1) {y4OJZz lq
print("1 user online\n");
Xrl)yD?1A } else {
0@!W5Z J]j5A print("$user users online\n");|:v*roJm^g&E:Mq!h3v
}最终把上面代码写成一个PHP文件如下。
$ih-G;@~{+OP <?php$ZgQ[6e C#[ ^a
//Put your basic server info here
l.jlTx4v $server = "localhost"; //normally localhost
}W7o6Z0`WG $db_user = "root"; //your MySQL database username
*~7_+p ?3@i3YEi $db_pass = "password"; //your MySQL database password+w y0^Dd2a8W,|
$database = "users"; b"f-MI7g^yB
$timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably are
#Hf,k3~4u:z'Y"O // offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last*I~3];TlJT
// $timeoutseconds seconds):^iN;NYz_2e
//this is where PHP gets the time2TgOn-vp@$l [oC:v
$timestamp = time();N6~m)\)S!^*S k%k
//counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed
b-y7u(y:ti`B $timeout = $timestamp-$timeoutseconds;
n9AZuH5Z"_W //connect to database]1w~/GwL
mysql_connect($server, $db_user);W
q#N/pA1u0Th
//add the timestamp from the user to the online list
liJ ~.}R.X#Z;e $insert = mysql_db_query($database, "INSERT INTO useronline VALUES
} L0Iy1^Y ('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");Ra K9Qn2e@
if(!($insert)) {
|&@zP7i print "Useronline Insert Failed > ";
CLh vXo:n }V8p/f%y}fBn2t
//delete the peoples which haven't been online/active in the last $timeoutseconds seconds.
kz|jL5P'J/c $delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");|-bmSm;r
if(!($delete)) {KPI
s o!s:a
print "Useronline Delete Failed > ";
XU1FK@UWY.e }
S n4?#H+IL(~"agZ6h //select the amount of people online, all uniques, which are online on THIS pageBn,Pt0u\9FK6X H%s
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");'];@*K7|+]_O!\g/v
if(!($result)) {
;MVp(`4ge:i&M print "Useronline Select Error > ";O*O%gBiu1|E
}w D[6uW*W
//Count the number of rows = the number of people online
3r)go5OG+ZT a+~f $user = mysql_num_rows($result);
(fOIN(z+l //spit out the results
&`_:hB7JvN mysql_close();8c N!^v2{0ec
if($user == 1) {
E,U
C1D&h h`m-n print("1 user online\n");8_5k7N4eJ*jW#N
} else {'p?cPk
print("$user users online\n");
1dL0p
`{ }
(v@D`:w*s|Q'}-Z ?>
K*aaF"fc"L(ph [url=http://www.now.cn/vhost/][img]http://b.todayisp.com/bbs/760x90h.gif[/img][/url]
cKb,dO 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。
1O8m)k(\~#^] 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。U+B!Kx4e+~J~ zu8E
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。
NH M y_E8pt \f 当然啦，这两款主机也是相当不错的。
4VpS2n&w1\$HK@m;Q 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
di9?A3TO 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kC|5D"vV
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] e
?#WrC
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