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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！T_~6Dc r6WM9o
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。
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gs'D%nG 首先我创建MYSQL数据库表。
{3^ kz*jQ8\8{ [A CREATE TABLE tablename (0P8]"a&\8}_L,n
field type(max_length) DEFAULT 'default_value' (NOT) NULLiAi7jEtt V0m x-t
}可以使用的SQL语句。
x s+Ru^i.l CREATE TABLE useronline (
)t!^"^"q+x ~O/N timestamp int(15) DEFAULT '0' NOT NULL,2`!y
g*mHqo2Rb@tK
ip varchar(40) NOT NULL,/ie0Uc(}@+w
file varchar(100) NOT NULL,Gq
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PRIMARY KEY (timestamp),8`4D(c"[
S+t'ql
KEY ip (ip),n;yl^$F9C
KEY file (file)
cE Wz+h9T!^t.j );下面我们是PHP脚本，首先我定义MYSQL的信息。
X*qB#O/| $server = "localhost"; //你的服务器
]-o8BV(s4c:}$N $db_user = "root"; //你的mysql的用户名^9G6Z7WOYGiU?
$db_pass = "password"; //你的mysql的密码
'D:xO4z0I`7Pt $database = "users"; //表的名字设置统计的时间(多少秒内在线人数).a0~2k,V$I1D
$timeoutseconds = 300;取当前时间。$WD9qRMV??q
$timestamp = time();上面的完整代码：
jaH#p z!R N <?php/[yx[/YGP-z^-t
$server = "localhost"; //your serverA.W,S+o)@'XKV
$db_user = "root"; //your mysql database username)dF_O5Q
$db_pass = "password"; //your mysql database password if anykg.Bt?4J}JfR'k.q/C
$database = "users"; //the db name
)h]n Fj(kR5p|
j+x8? $timeoutseconds = 300;//timeoutseconds limit
;g M:BMz*C5gP.M //get the current timekw%B UBRf3b
$timestamp = time();
}.OT'~9h6i //calculate the lowest timestamp allowed
{+NDo5C8F2z5b $timeout = $timestamp-$timeoutseconds;"v*[`7j%Zz
?>连接mysql
/m(BR;b5CDT mysql_connect('localhost', 'username', 'password');也允许使用变量形式。

A hvuCX mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接&z S9v
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mysql_connect($server, $db_user);查询数据库的代码：
&m1`Db fUnTDcS mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。"[ B X)Bgn
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES"d9L;T$V.u?{*e
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
BhC9G1C 如果用户用错误信息的话，这样处理。
Q6y+]wJ8xu v:vnu if(!($insert)) {
+clTW1dE#_ Q(L print "Useronline Insert Failed > ";W(tP8Xx{[(Z(r
}然后实现当超过设置的时间就删除该用户记录。 S^K HR_P
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。
0Z3A u']g5\p|^I if(!($delete)) {
:]f%ql!M/F]/c+[ print "Useronline Delete Failed > ";
vS3axs9^{7W/xM2\ }下面我们解决数据库中不同IP的问题
'|O!W!{7~3fx;r $result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用
X2Hzp%y mysql_num_rows(query);来统计用户，代码如下。
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$user = mysql_num_rows($result);最后关闭数据库。
+xJls2H$tlj mysql_close();显示在线的人数。
4Tv/t6`;lZA0? if($user == 1) {
Q"s%c|&I print("1 user online\n");.iH9aUUh0E
} else {
@)Lo9[:p@V.Y print("$user users online\n");
8]&M.n4RPo5t ~qb }最终把上面代码写成一个PHP文件如下。
WKB2I(Ed0SXO.x@ <?php
Fx P5u2~[!\ x`} //Put your basic server info here
U;vU0j+Wu5N Iq0Gu $server = "localhost"; //normally localhost
p5H%L`.L8mJ;{ $db_user = "root"; //your MySQL database username
+a8N1o*x5wg $db_pass = "password"; //your MySQL database password*{~,Sm)_#k
$database = "users";6L\
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$timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably are
kO&G$\1r Zo#M // offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last
z,]+{%Q'SN$Ub // $timeoutseconds seconds)
yDr9C,aB"y //this is where PHP gets the time
i(a0^|Y7me
l.Z $timestamp = time();
o&B%MR6lL)k6` //counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed!\ZuweA
$timeout = $timestamp-$timeoutseconds;5BKgI/ol&C
//connect to databaseDx%cN6NkM
mysql_connect($server, $db_user);Q'{e{$i@ A
//add the timestamp from the user to the online list
B[%Plf~[8m $insert = mysql_db_query($database, "INSERT INTO useronline VALUES5uj;IZ:H%b$S
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
6^"o7K`%V^{ ]N7c8Z1Y if(!($insert)) {
)zeN jH| N print "Useronline Insert Failed > ";pIrO9ym~
}
$|-f*\,b8H
_%tBy //delete the peoples which haven't been online/active in the last $timeoutseconds seconds.
TK&A)rl $delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");#S3Lw NG8cVij
if(!($delete)) {r7O~(T7p5Ouo
print "Useronline Delete Failed > ";rtaMh"s5g
}7m*D k$cOlpJ
//select the amount of people online, all uniques, which are online on THIS page
[ Ah.`7b`\O }m
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");i$Y#Y Y;G)nh
if(!($result)) {)AI6A
Pzz t
print "Useronline Select Error > ";
0| tq(yz#e }d7Ib Xr
//Count the number of rows = the number of people online
&n6\ry vW $user = mysql_num_rows($result);lg;oE-B"K9H5g
//spit out the results;e1kg(dN!T,Qr V]
mysql_close();+n;G5|x[(mt
if($user == 1) {7V+G B0E G
print("1 user online\n");
2tJ g3X*G } else {
7Rq!w'B$?T'j e| print("$user users online\n");
R!B*B?&_:VeC_ }
Z o3jS*^9W ?>
b,gXMSkJ [url=http://www.now.cn/vhost/][img]http://b.todayisp.com/bbs/760x90h.gif[/img][/url]
.HR~-{1R 以上代码我是在时代互联提供的免费试用主机上测试的，感觉效果还不错，性能很稳定，不信的话你也可以去试试。当然，记得指出我这个程序中的不足先哦。$x fW
F3X T/d
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。1i Zroa
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。
c A3D"Z2u6CP'F"{A 当然啦，这两款主机也是相当不错的。
`.a g [&R fc0y 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
4pj)[uT1S)rl 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&ZMwFq5Y/[*tlpG0z
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]
R K1FHNB5[
R~9z)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]+N!T;w8^B?%| r
自己加QQ去问吧。

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