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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！iG2@5ZW|I2i$R
我是用PHP+MYSQL来写的，原理：网站在线人数的程序代码+后台有MYSQL数据库支持，可以直接统计出网站当前的在线人数。
s6E$w Iu 首先我创建MYSQL数据库表。
}z8nE%F,]*P'K0o:NT CREATE TABLE tablename (
Dw;b7M za4Z field type(max_length) DEFAULT 'default_value' (NOT) NULL-~^.NoY+}
}可以使用的SQL语句。 qYp;]#{z
CREATE TABLE useronline (@.R k&d+B~L)W
timestamp int(15) DEFAULT '0' NOT NULL,
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SM'[7EW4a ip varchar(40) NOT NULL,
+eGi.R_S2Tn file varchar(100) NOT NULL,
VXob0?_8G PRIMARY KEY (timestamp),
,Ss7u["{7NR|sF&P KEY ip (ip),
L}y@S
\vpU*N KEY file (file)/Im4WR;W5XK6@K
);下面我们是PHP脚本，首先我定义MYSQL的信息。(D9R_2R4?P
$server = "localhost"; //你的服务器_Ve
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$db_user = "root"; //你的mysql的用户名

r6X1l.I#j(t.\m/J&T $db_pass = "password"; //你的mysql的密码
7M8CQQ+}t Q $database = "users"; //表的名字设置统计的时间(多少秒内在线人数)T$z[#UMsy/Dg
$timeoutseconds = 300;取当前时间。 M&m-Y#i2G
$timestamp = time();上面的完整代码：n'ni?
W)c)D`t
<?php&`Vk']:h?E*c
$server = "localhost"; //your server
mO5?;vJ9CZG0v4| $db_user = "root"; //your mysql database username
#N6Ct p#US $db_pass = "password"; //your mysql database password if any
8}H~N)Lse $database = "users"; //the db name`K V!{RxWoL(U8R
$timeoutseconds = 300;//timeoutseconds limit$gI
S;Q5g5zD{
//get the current time
K~,v7|/}4T~ Y $timestamp = time();
]UO{_.T)@3@ //calculate the lowest timestamp allowedN
[?!FPl9@U
$timeout = $timestamp-$timeoutseconds;%Ae J.Wp J#w
?>连接mysql
$S9LV)LH0u5P mysql_connect('localhost', 'username', 'password');也允许使用变量形式。4L3o%P9[&Yy6b#`
mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接&p9^z-da
mysql_connect($server, $db_user);查询数据库的代码：
)WQj ?S(B mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。
+f6z]2U O,{,s~ $insert = mysql_db_query($database, "INSERT INTO useronline VALUES
|q/`%d*[W1p{'VB ('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
6c
cg wr5W}A'b 如果用户用错误信息的话，这样处理。
~0r(f*V(u8iFB if(!($insert)) {5o-F3}TC;l(d
print "Useronline Insert Failed > ";

TS0L5R.NG_)| }然后实现当超过设置的时间就删除该用户记录。P'Gd^.O_(x"K0m
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。,R;~._){*[5I6V5o)G&M
if(!($delete)) {~9zM.]G7u
print "Useronline Delete Failed > ";0`5o"l*v8g&Z2D2t;aH
}下面我们解决数据库中不同IP的问题b(^ F*~IF
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用
:M#m,aC^#Y+la mysql_num_rows(query);来统计用户，代码如下。'j;{8M`/y0l
$user = mysql_num_rows($result);最后关闭数据库。-p;jb-kP4G
mysql_close();显示在线的人数。CZ/b6Hv
if($user == 1) {X}*Zu,Th Zn-il6b
print("1 user online\n");6r9} a f a*DVP,{9ye
} else {){QKGi}9C}@
print("$user users online\n");
z8hy7_o B }最终把上面代码写成一个PHP文件如下。6X%MF PEms
<?php,S?2a_W@W G8On
//Put your basic server info here
(C5Gu F3}t $server = "localhost"; //normally localhost
Z6\.KR@$VL $db_user = "root"; //your MySQL database username
E-O;@z$L*\r^-f $db_pass = "password"; //your MySQL database password
,f3jC0]t#eW $database = "users";7wu&s;w
@ n)Q5B7A
$timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably are
C0jiw"qS!S(C$s // offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last

](m%d)rvs // $timeoutseconds seconds)p!G5CFwA8[$c\ Y
//this is where PHP gets the time"N'VB%y9|zd
$timestamp = time();
\OF^!A //counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed
ACz3_@"F $timeout = $timestamp-$timeoutseconds; C}b@
dC`
//connect to database
]M!ZZ'@V mysql_connect($server, $db_user);
&Sp%UB5JX //add the timestamp from the user to the online listpmQ&u"o_ v'T
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES
;usv1F l~x'jX ('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");PEjA2w|~Nj[
if(!($insert)) {
6G5DOmW {5^eRl print "Useronline Insert Failed > ";@0Bbj[+r]4j
}
E'v5{R(RQ+b
//delete the peoples which haven't been online/active in the last $timeoutseconds seconds.
c|;sZG1s^N $delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");qk1}%Ks@7S+v
if(!($delete)) {#j9E!wDC7RfqY
print "Useronline Delete Failed > ";
*u%WU1B\r{,qO.X(c }
(?0c
?T"xzF0Zj Y //select the amount of people online, all uniques, which are online on THIS page
l$P/QW"V-X $result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");aq^3V-}jq,`
if(!($result)) {8X+]F9HX:Z+H
print "Useronline Select Error > ";
Plp
tF4W9Gq5`Dx }
jbn:S'FM //Count the number of rows = the number of people online
zpd4H9e $user = mysql_num_rows($result);Q+]*t@R0G0W"e4iL
//spit out the resultsv^;J;x!XyH3Z?Mu)K
mysql_close();9DS^(I/Oa&{
if($user == 1) {
#kT`J?+h L print("1 user online\n");r&XR2MDz:o
} else {
!St]$ki{_"mA*b1M9s print("$user users online\n");{Y7A-V~
}
a$?PM]%B ?>
z)zf:c)Gmc [url=http://www.now.cn/vhost/][img]http://b.todayisp.com/bbs/760x90h.gif[/img][/url]_[ \!W k
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。
Y-s\!b:L 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。z%R3G_p'LAbH]
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。
8X\B*[7xE9gU 当然啦，这两款主机也是相当不错的。
gV F)di v 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k#s$q\ @? a-n
标准商务B型：Unix /Linux 操作系统+独立网页空间500MB+送800MB邮局空间+60MB MySQL数据库空间=1365元/年
as$^
A/[@|p0z 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]
@C b/]/N4d4Tm 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]
d m^vg[9^q}s,p 自己加QQ去问吧。

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