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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！
3P%A|_Ee 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。
LH@ F?6g]6w/c%R 首先我创建MYSQL数据库表。
N,fK]6{1Dc$I CREATE TABLE tablename (
T(J]8kD+F field type(max_length) DEFAULT 'default_value' (NOT) NULL
$a7] GZ%?$w6MBs }可以使用的SQL语句。&W+P+_ U${Q
CREATE TABLE useronline (+H*j6K+c!m G
timestamp int(15) DEFAULT '0' NOT NULL, Gj MU}Vu
ip varchar(40) NOT NULL,ql \e JG
file varchar(100) NOT NULL,
P({Q!Q:f#|P8V[/q9kg PRIMARY KEY (timestamp),
+vX;{e~G&f5Z KEY ip (ip),F6Bg-s'[,a!kH
KEY file (file)
W5qQ+g:odN );下面我们是PHP脚本，首先我定义MYSQL的信息。9Mb3\;QSYX1R"F`
$server = "localhost"; //你的服务器-F)A.Ed%]i
$db_user = "root"; //你的mysql的用户名
!L`s.`2y yI&?h!_ $db_pass = "password"; //你的mysql的密码2E9{\W5d/^
$database = "users"; //表的名字设置统计的时间(多少秒内在线人数)
}5A'X;WBn-F2~
$timeoutseconds = 300;取当前时间。&WiM/J8e zU
$timestamp = time();上面的完整代码：
8q0R/rvN^ji~ <?php
E:DB*l,m V*^,i $server = "localhost"; //your server
*g%o1Tb!VJ!Z&{C $db_user = "root"; //your mysql database username
#^%sEx&HPg $db_pass = "password"; //your mysql database password if any
f/mZf#],?3n'r`I $database = "users"; //the db name
J[W7~2Q%_g@ $timeoutseconds = 300;//timeoutseconds limit9Q2j;|xQE
}
//get the current timee"oj3Q)xL#vJ
$timestamp = time();I qK7Z3P aO#Rw,t`
//calculate the lowest timestamp allowed
kvQ%Bl $timeout = $timestamp-$timeoutseconds;v r-s o[c)^H3w
?>连接mysqlH|3u[-yW#dJ
mysql_connect('localhost', 'username', 'password');也允许使用变量形式。
S6|n
TUk1U(e mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接lhfe \p_3K(c~
mysql_connect($server, $db_user);查询数据库的代码：
S'cYMP@+zt T mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。
X$R Htn.sC;o $insert = mysql_db_query($database, "INSERT INTO useronline VALUESNt
V?C y-b
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')"); t+yR J#e W;a
如果用户用错误信息的话，这样处理。4r/Tg{n)\q/r
if(!($insert)) {
ED)X)_3W+d\ print "Useronline Insert Failed > ";!R!Xb8?e|Se!B
}然后实现当超过设置的时间就删除该用户记录。j:dm1od)Bv:f'y6t
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。0k^3b+X_:o6m9\LC
if(!($delete)) {+],o1v;k P?$ESD
print "Useronline Delete Failed > ";Xx.V7Vv x$DT
}下面我们解决数据库中不同IP的问题`f*A3^M] p
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用
k,{*_N,~ye mysql_num_rows(query);来统计用户，代码如下。6FRrP^e`!N
$user = mysql_num_rows($result);最后关闭数据库。
AYE^ UViv} mysql_close();显示在线的人数。g_ h t'e?;U
if($user == 1) {
4@)t$g#Uw)R print("1 user online\n");6G
VI [ Mk0|
} else {1t*F/bm|Q-@7Y0d%mK4i
print("$user users online\n");~_6D8q#?5^X|
}最终把上面代码写成一个PHP文件如下。"Z4aC8N"`q
<?php @(X E T+o(D&M:B
//Put your basic server info here
W-V4GO9IL,s-Q%[)U3@7@ $server = "localhost"; //normally localhost
[2TB-Ysn $db_user = "root"; //your MySQL database username8e}e,j _9p?@ oA
$db_pass = "password"; //your MySQL database password
1O [I;eG+R? $database = "users"; o%jW5l5S `1{
oP6o.H
$timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably areU{4q2\FJ} s1\
// offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last+zUgfU|kz,b
// $timeoutseconds seconds)
]1n%f.p2\HkS` //this is where PHP gets the time
,Jgv\*b1B`D9L $timestamp = time();j1I`5_7k
//counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed
$NU-mqq){$NM $timeout = $timestamp-$timeoutseconds;4g0x|4ZG(W
//connect to database

u'W#W1A%N.s mysql_connect($server, $db_user);F8F1Mgb'G{
//add the timestamp from the user to the online list
\/x;^ MOT'F $insert = mysql_db_query($database, "INSERT INTO useronline VALUES
#Bn&bhW:B'w;H,d ('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");Qb9P~W MRptO
if(!($insert)) {HM7IQ0`vr.fT
print "Useronline Insert Failed > ";` i3ASG[#`3y(q#RK
} I {P[ c:q!bD
//delete the peoples which haven't been online/active in the last $timeoutseconds seconds.g9Ypc!b u:\0`
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");
4J^ad o if(!($delete)) {%D@Wr l
print "Useronline Delete Failed > ";
!~f7o l7[x } _F4o7]P1? n
//select the amount of people online, all uniques, which are online on THIS page
&nK|XFF5X`+mX $result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");
+] V)y d_ if(!($result)) {
1qlS+g{ Npl
n print "Useronline Select Error > ";Ti|e8HOD"F5S
},D8E\jkVL
//Count the number of rows = the number of people online$l"_xOt&D
$user = mysql_num_rows($result);
weu3Utz8o //spit out the results

O} Lb8lw k K4_ mysql_close();
J2z%u-[4cpfCK q if($user == 1) {Zd'X6c~
print("1 user online\n");/P?#N
f5}6_6FYu
} else {6B!n(^[,M
print("$user users online\n");@8[9V#_)jG*@a
}

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s)dl4m9Z8E'O [url=http://www.now.cn/vhost/][img]http://b.todayisp.com/bbs/760x90h.gif[/img][/url]
W1t7ZE&S4]7]hp4R 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。
p$@+g rC%N3q+} 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。
2Kw[+BBbW~)} 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。%|4](P~F)B:\
当然啦，这两款主机也是相当不错的。
1T:g7yK J1D 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V.vm*PSB
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
,o'x(I&y%h2lN}s I/] 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] ;g8SR0m5? v:n t
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]zgOJUa4l?kW
自己加QQ去问吧。

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