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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！
/N{8\)bo(Io![ 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。
C
]P L-Q-L 首先我创建MYSQL数据库表。s~H8r#c-i2PQLO&t
CREATE TABLE tablename (&o*|?Ey_S oa
field type(max_length) DEFAULT 'default_value' (NOT) NULL
)e,j
By
U[1H%oNm:g }可以使用的SQL语句。
/Se saT CREATE TABLE useronline ('a*g|9d%Ae/f;mn#O
timestamp int(15) DEFAULT '0' NOT NULL,T? ?_^YoT
ip varchar(40) NOT NULL,
#EI"n-S+cYIA*E file varchar(100) NOT NULL,
9O!J3[O3{8o8|,f!|7j'` PRIMARY KEY (timestamp),
w![T W7yy6i#X KEY ip (ip),
B/g6Yz@e KEY file (file)#R!Ch0hWb![9eu
);下面我们是PHP脚本，首先我定义MYSQL的信息。
kk:B g9W%] G1Q $server = "localhost"; //你的服务器
kzr+i9Ph3G $db_user = "root"; //你的mysql的用户名 euf@ cc2KE)x
$db_pass = "password"; //你的mysql的密码
,g7{
qL/W $database = "users"; //表的名字设置统计的时间(多少秒内在线人数)
Hs)L|EA.V4?)d-V $timeoutseconds = 300;取当前时间。(N/~ g)l z^C.w*s
$timestamp = time();上面的完整代码：t7AHi8Vl
<?php
0t;\,m!mBp&^h $server = "localhost"; //your serverN
ALE@mXO
$db_user = "root"; //your mysql database username
k/wSG;{_NY[(d $db_pass = "password"; //your mysql database password if anyp0vS9d"Avn'?Gy
$database = "users"; //the db name5CsY6XxT9GQI
$timeoutseconds = 300;//timeoutseconds limit
;L7mx4_P8v0ot)h%vO //get the current time'bvu(n)z
$timestamp = time();
C\9yr
g])KC //calculate the lowest timestamp allowed
-V0CQ_O/_Y $timeout = $timestamp-$timeoutseconds;
/z @,no1dna ?D ?>连接mysql$r9oQgI!S!ktR[!L
mysql_connect('localhost', 'username', 'password');也允许使用变量形式。!R6h5tF6?9G
mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接
)j${e1H h mysql_connect($server, $db_user);查询数据库的代码："Gv6d|b
\;A
mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。
-i:OG%Z_1hK{7Rk $insert = mysql_db_query($database, "INSERT INTO useronline VALUES
[a%\6~"C ('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
du@"|`5mn6BX 如果用户用错误信息的话，这样处理。
(?e}}:t'QoF$ec*@r9Y if(!($insert)) {
%`@1d7Fr3dM$Hi print "Useronline Insert Failed > ";(}.k?$`;I
}然后实现当超过设置的时间就删除该用户记录。$G EF$^'l
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。
9?/w vVrEX*x if(!($delete)) {oB,u'K zs!x
print "Useronline Delete Failed > ";
3mE2HA6YQK/p }下面我们解决数据库中不同IP的问题8QZ?Gcf W8NY
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用
.Z2^}7@$C,] h mysql_num_rows(query);来统计用户，代码如下。
j1?e$PR-_$k_/y $user = mysql_num_rows($result);最后关闭数据库。3c7A+JZ%}ri
mysql_close();显示在线的人数。"g U8a9CL
if($user == 1) {
RN$F m1g~6R$YT} print("1 user online\n");
'_w]JgHd!i2m } else {
R}ZI(W}g.W print("$user users online\n");
Gx-Yx!n"k2] }最终把上面代码写成一个PHP文件如下。
]?w/k.W_Q[ <?php
w8`yS5Nc%sP //Put your basic server info hereEtAbQ
$server = "localhost"; //normally localhostaQ^0S j-X,G!Ci z
$db_user = "root"; //your MySQL database username7\.W-rMy/Z,~4w
$db_pass = "password"; //your MySQL database password
U?#}K`-P.Cd $database = "users";\Zg_4Uk/B
$timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably are
o'a)e*`(y)U_ // offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last lr!x-d5?;j
I
// $timeoutseconds seconds)
^ N;` _[b0lX+ok7[ //this is where PHP gets the time L3@7rEr,m5mM
$timestamp = time();
jP[HO/c/l //counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed
B({6S Jr,b(K $timeout = $timestamp-$timeoutseconds;
9Z-J|\(CF%L //connect to database4p3L3BA8x"d\[xd8v
mysql_connect($server, $db_user);-O u"pC!}D
//add the timestamp from the user to the online list_{1bt,O4F
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES
*g^4|TR I/| ('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");1OE%N?&QD&z
if(!($insert)) {6_%Q0Ilud
print "Useronline Insert Failed > ";4`%iKi4DT
}!T$jL*S)ng!uM3R(aP
//delete the peoples which haven't been online/active in the last $timeoutseconds seconds.

g/G f\b~"BT%i $delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");
h.x$CfS/` if(!($delete)) {
.ipJ'kD0y print "Useronline Delete Failed > ";6h$C c e9n.\OE
}f2}9o1X/V Q
//select the amount of people online, all uniques, which are online on THIS pagejR*tBi`N$`R
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");&Yf/ny O]%O
if(!($result)) {;H,s(~y3k
print "Useronline Select Error > ";hh}K.D6JB"ZZ
}4_1Y;U'w[0x#dKKq
//Count the number of rows = the number of people online
a7W(eW GF5Gky $user = mysql_num_rows($result);
6O(R"z1_9Da&n9] //spit out the results2gh1Q
eAvsqE
mysql_close();
q2tNH-x2q#J T8o if($user == 1) {
5|^/y1g$qr? print("1 user online\n");
$^H
Ti0Vek D } else {xHz+g"rCs3Q
print("$user users online\n");
]l$^\b)V| }
p^+{h"Ca H ?>
h8P[)e~v%~JP.Y [url=http://www.now.cn/vhost/][img]http://b.todayisp.com/bbs/760x90h.gif[/img][/url].}$s
M6B%c5Zz8y3DC7qn
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。@Ou h+yp
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。+b.c1kY/t#m1\P E:@ K
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。Ov`&W?m
当然啦，这两款主机也是相当不错的。|+b4|nB]0u
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
R nB:Y3H 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v6D8S p-Mf*X,ZF
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] 2T&n$aL.Gnn
空间专线： 0756-2623871  QQ：168075865，好象还有全球免费网络电话:全球免费咨询电话 [url=http://www.now.cn/callcenter/call.net?LineName=55]http://www.now.cn/callcenter/call.net?LineName=55[/url]
M.C-g$w3G3r 自己加QQ去问吧。

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