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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！w%V/T3E D.sq[
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。:^d/B8S `9]7r$g F
首先我创建MYSQL数据库表。
'KVM I/~5~ CREATE TABLE tablename (
a)v'RF ZUoYk field type(max_length) DEFAULT 'default_value' (NOT) NULL
5S4~8b-qW;u }可以使用的SQL语句。REG8a6bom
CREATE TABLE useronline (
.g%DY/Ih-~ g timestamp int(15) DEFAULT '0' NOT NULL,jh"[]k g"AV8pe!|.M ~
ip varchar(40) NOT NULL,
)P*{"M uhSX file varchar(100) NOT NULL,
/sP_:IRC.t2tK PRIMARY KEY (timestamp),r ]\OEXXw
KEY ip (ip),
9{;P\!p"w,j? KEY file (file)7p7{1V6Z3J
);下面我们是PHP脚本，首先我定义MYSQL的信息。

AF/b xswm $server = "localhost"; //你的服务器
0}Aa9l"Dv0BK $db_user = "root"; //你的mysql的用户名Q b!a3voGA
$db_pass = "password"; //你的mysql的密码
!Xe$``,PP/x $database = "users"; //表的名字设置统计的时间(多少秒内在线人数)
q]*XM\w/c;O*J $timeoutseconds = 300;取当前时间。LS+v)aD.Oo K!x U`
$timestamp = time();上面的完整代码：
&j9B}K2ns <?php*AG[ b9H/a
$server = "localhost"; //your server:DA Nvt^@b#F
$db_user = "root"; //your mysql database username
*{mP2p\`
\7w $db_pass = "password"; //your mysql database password if any)p5_g)Pj#lE4? }1B]
$database = "users"; //the db name!b3U*Zu;fX;cCe-r
{
$timeoutseconds = 300;//timeoutseconds limit.Xh2v+Zr:\
//get the current timeH8I1W-n8DD Fk/}6]
$timestamp = time();
}q5I.i&?BJ:xiOor //calculate the lowest timestamp allowed:LzIH!b0rJ;l
$timeout = $timestamp-$timeoutseconds; C,r.w"T,R
?>连接mysql~L0wOa6m-K.b|
mysql_connect('localhost', 'username', 'password');也允许使用变量形式。&z&Y`(R1B b vU
mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接m&V~a[@
e lS X&}
mysql_connect($server, $db_user);查询数据库的代码：
A9SCkj-c6lI mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。Ef4q&\"S s(A
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES
y)r^P(K6kfs ('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
&[E0](kS 如果用户用错误信息的话，这样处理。X*{JzKte
if(!($insert)) {
,{XthU|R9\Gr print "Useronline Insert Failed > ";
A{@C}E8M*vS v6Z }然后实现当超过设置的时间就删除该用户记录。
A8HT4D^j_i"\U $delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。o4Bd(N!r~T-Ay
if(!($delete)) {.T#}4^U0m[
print "Useronline Delete Failed > ";L0sk(}*u)b
}下面我们解决数据库中不同IP的问题
'T8Rp6Sf"d $result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用
c/j _*b%e'p$h
mysql_num_rows(query);来统计用户，代码如下。iDh3zCE-S.ePAw
$user = mysql_num_rows($result);最后关闭数据库。8`AaRHa5C
mysql_close();显示在线的人数。YR'rq2i_O
if($user == 1) {
u-~-}-x4^ p$S
RCN print("1 user online\n");
U*n{~um2zk$K2U } else {
P\-k!u~\ G?$] print("$user users online\n");
)fCpF^@(O }最终把上面代码写成一个PHP文件如下。/G4n"~-KHuog'U
<?php
,G%a ]X|
sH5u%f:fX //Put your basic server info here
,@:M'F#],\ $server = "localhost"; //normally localhost Xz{1kZ3E!Q
$db_user = "root"; //your MySQL database username
K*SC9} f2n $db_pass = "password"; //your MySQL database password

|Q1J:b"bB $database = "users";3y/L0p.Y_6};J#@t
$timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably are.A*V7~v1eV
F[*z;Y
// offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last
U4v h q tx`6H // $timeoutseconds seconds),RLN!`i
//this is where PHP gets the time
M:h y LL1W8Ng $timestamp = time();#J"iR1HGA
//counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed
$zu.R'I
o2nKE;w $timeout = $timestamp-$timeoutseconds;
*c.a`4n:\ew //connect to database
X!gq%iR;M
UL mysql_connect($server, $db_user);)PY+Q6H&y P%{J$u
//add the timestamp from the user to the online list
%UeV:h;n0jev $insert = mysql_db_query($database, "INSERT INTO useronline VALUES
:z%^h/Q`hb$s ('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
+c/al$]B#{e if(!($insert)) {'qj9Pa`G3oz
print "Useronline Insert Failed > ";
yL!{0bm m!@*p ^^ }
I$K.Lb8gCTE //delete the peoples which haven't been online/active in the last $timeoutseconds seconds.?E$r;b@.v];? jBZ
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");
;} b,tY$M`9p$Z.L if(!($delete)) {n.]M'd L/GFW6IR
print "Useronline Delete Failed > ";
+w*TY*_HW }*Bg?,Gp;E!}$f;?Q
//select the amount of people online, all uniques, which are online on THIS page/b
s6zG8xwY5[o
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");
8^v/tX)]-w3f5J` if(!($result)) {gg%xRc|1?6e
print "Useronline Select Error > ";
#Rha4P0M:Xxi }NEt
I iRB
^
//Count the number of rows = the number of people online
5X tzPHv"{#k $user = mysql_num_rows($result);:M1Lu
v]_
//spit out the results
D`D1DC mysql_close();
A"EFp-@I&_i if($user == 1) {b|/EP+fM+G
print("1 user online\n");7|0F&y6B5VO(c
} else {
`e\j%[z4p(X print("$user users online\n");x|-}wM3K'UU
}
hufC U8q ?>
+s)tF^ T4} [url=http://www.now.cn/vhost/][img]http://b.todayisp.com/bbs/760x90h.gif[/img][/url],fg0It:Kl5~
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。/]EAM u9c T8k GV0L0{
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。P \Oo}#lwR2U]
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。+W}:fZi_
当然啦，这两款主机也是相当不错的。8@V2C-}
s/q u S
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
*P|s z&s#[I ]+]O 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{nwU-OvM
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]
@7d:S6{&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]
/V;GK0v#F;Q l 自己加QQ去问吧。

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