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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！3]4X~E8?I0BL_
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。i8`&SK0N[
首先我创建MYSQL数据库表。
/Z&o7x
w1rQU7onC CREATE TABLE tablename (
b}[5Z]9p zaW field type(max_length) DEFAULT 'default_value' (NOT) NULL@6N9}D#xm0\
}可以使用的SQL语句。{6G*Z[T1yw
CREATE TABLE useronline (Q)}-G,w0W:X|t)Z%[
timestamp int(15) DEFAULT '0' NOT NULL,
z*M [3@t^Ic ip varchar(40) NOT NULL,
5aR-O3R]}'jx*} file varchar(100) NOT NULL,9X Q5oM@s:j
PRIMARY KEY (timestamp),
(^yyb;jYA[1F KEY ip (ip),
0Z!],Z,?w@-Mu6] KEY file (file)*R9kL8e(w
);下面我们是PHP脚本，首先我定义MYSQL的信息。aR/QSfHR1ncJ \
$server = "localhost"; //你的服务器
w:^ST;u"]k-avT $db_user = "root"; //你的mysql的用户名
k} SFxaMX $db_pass = "password"; //你的mysql的密码w'k4N1LW`f/i
$database = "users"; //表的名字设置统计的时间(多少秒内在线人数)0W*t;R/q*DUE
$timeoutseconds = 300;取当前时间。
`*U
WlZ-L $timestamp = time();上面的完整代码：
Xj{YKq <?php
saK`"w#K]T $server = "localhost"; //your serverY!v6K;rf:{-D\
$db_user = "root"; //your mysql database username
8]8I/\)|,kfD.X $db_pass = "password"; //your mysql database password if any
]9][[K/kcd r)D $database = "users"; //the db name v&HP BjG7Q%mrH
$timeoutseconds = 300;//timeoutseconds limitQ0BI2UKIiX?"K
//get the current time
;q K)s4K7g'l $timestamp = time();q*k?t3\B1X
//calculate the lowest timestamp allowed/?$v:}+|rl
$timeout = $timestamp-$timeoutseconds;
K J
V6HoRO%\l/E ?>连接mysql
fW~xb.r3VYH mysql_connect('localhost', 'username', 'password');也允许使用变量形式。
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Fsi| mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接
'wt@}4ra:` mysql_connect($server, $db_user);查询数据库的代码：1sXt'd0wj(Y}a1Zi
mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。^ qA
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$insert = mysql_db_query($database, "INSERT INTO useronline VALUES
@:Z:b/LS8| ('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");] Lh;_0l$Gr
如果用户用错误信息的话，这样处理。
rVg0lf%o0u if(!($insert)) {
z,M:q\:Uq`I2E0t l.q print "Useronline Insert Failed > ";
w F8sKb H)B:`6D6j }然后实现当超过设置的时间就删除该用户记录。
(f;v&s*i ka
d` $delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。/}9n:rR S/Y
if(!($delete)) {[D1SEd1f"e
print "Useronline Delete Failed > ";
,}~a3v]j\r }下面我们解决数据库中不同IP的问题]cydI
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用
bwi1re mysql_num_rows(query);来统计用户，代码如下。2\0V rDa@6r
$user = mysql_num_rows($result);最后关闭数据库。
*|;LXJ4y ? ^"O,d mysql_close();显示在线的人数。

`6|W0S,F
P[`kh if($user == 1) {O
K}/xoq,q3GH
print("1 user online\n");P#Hk2i!X7e{*MS
} else {\&l4i]!U+B'e
print("$user users online\n");#z.Dgy @!h,g
}最终把上面代码写成一个PHP文件如下。;@y*C.n5yb#P4A
<?php
}*HJQ-R#\ //Put your basic server info here
Ocl;N9|%R[a $server = "localhost"; //normally localhost
U*|GX$_7E7v3T9^ $db_user = "root"; //your MySQL database username$|
J `W2gMp*{'a^
$db_pass = "password"; //your MySQL database password
m:d8L({v\z $database = "users";jN.j`g*{f#N:G
$timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably are1w"K,i-qM
// offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last0lZ-OEyM(J
// $timeoutseconds seconds)-e VX7MYE!Uh
//this is where PHP gets the timePZ
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$timestamp = time();k7kO1t4Y,GtG:UJ
//counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed
ycS6sC+n Xd q $timeout = $timestamp-$timeoutseconds;,C9s,G+BdWT
//connect to database
bdPE2~*J:eT*@Z mysql_connect($server, $db_user);!gLJ h1J,`7f
//add the timestamp from the user to the online listd L)A o
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$insert = mysql_db_query($database, "INSERT INTO useronline VALUES
#J)U#x5K9f,SZNC ('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
B@+~r2s t)o-rkP
if(!($insert)) {\1^-Y"U'C'L4D7j7lG
print "Useronline Insert Failed > ";q5yp,c|z/Z M;Ol-R
}NP.A(Mb+aZ
//delete the peoples which haven't been online/active in the last $timeoutseconds seconds.
I3J F'E,HK4h ~ $delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");
6HwZ(f*Q7K if(!($delete)) {
1UN-j j;j6~;wO+@ print "Useronline Delete Failed > ";-t*m.PX7B#K9g
}
Rif$@N/qi //select the amount of people online, all uniques, which are online on THIS page
QDl)f-DA? $result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");:Cz(O*R4DiDF
if(!($result)) {
(N%QqW%fU print "Useronline Select Error > ";"mPiTi
}
:x'I3I,JV8uU //Count the number of rows = the number of people online om-|'M|&Jpmt|
$user = mysql_num_rows($result);
b&c.[*Tu //spit out the results
6I-G;Y;~gh.| mysql_close();
;BqZ7j v if($user == 1) {5OG,t-s1X$\/A3B7O
print("1 user online\n");0DOqV h3|*sAoc^
} else {1@iYs\f1O
print("$user users online\n");
2@.K
r%AKp*l0CrD }
+ePpV%[1Ap ?>
}0Jr.D+f4xJ`s [url=http://www.now.cn/vhost/][img]http://b.todayisp.com/bbs/760x90h.gif[/img][/url]Cz5T6ww
以上代码我是在时代互联提供的免费试用主机上测试的，感觉效果还不错，性能很稳定，不信的话你也可以去试试。当然，记得指出我这个程序中的不足先哦。
4fC.E,]v+FS$v 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。t5X8zC)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。
[5cdB[ a1XQtI&w 当然啦，这两款主机也是相当不错的。
1mRMl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
c#VXu4wO/lwX 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(_!C~)j"Gc r]
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] V:E,h-tG k
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]7Dm2uAu"S6F!p
自己加QQ去问吧。

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