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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！
\2Xw.J;M?%B%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。
s{.e-_w:A 首先我创建MYSQL数据库表。
;G'T.nb6bm0\Q CREATE TABLE tablename (*v"kg CHj fd5m
field type(max_length) DEFAULT 'default_value' (NOT) NULL
-t"OQ
Vdh [u*a_ }可以使用的SQL语句。
-[F9y3vq CREATE TABLE useronline (]2B!nm0A6c:F[n
timestamp int(15) DEFAULT '0' NOT NULL,THwr{
ip varchar(40) NOT NULL,{p'Ur^
file varchar(100) NOT NULL,0h*p!r1]{]
PRIMARY KEY (timestamp),ZC/@-V
| z"TtT
KEY ip (ip),A }4e3K7S&l
KEY file (file)`~{CZ/VJmm1\o9v
);下面我们是PHP脚本，首先我定义MYSQL的信息。!dT p~l~8i ]4{
$server = "localhost"; //你的服务器
{Q/T/A't3q $db_user = "root"; //你的mysql的用户名8qS#MZ*}4G
$db_pass = "password"; //你的mysql的密码FW*j*c
w6J$@(m
$database = "users"; //表的名字设置统计的时间(多少秒内在线人数)
0T3ZDR"E7W;Gi $timeoutseconds = 300;取当前时间。
o3ykkZ!|$i[ $timestamp = time();上面的完整代码：}(S8QB ^G:u
<?phpquK$Y-G3G
$server = "localhost"; //your serverP|T] F'A2L4`'VT:\"a
$db_user = "root"; //your mysql database usernameav%|*V$l
gi
$db_pass = "password"; //your mysql database password if any
t/M'LPj $database = "users"; //the db name9gte(E8WQlJ
$timeoutseconds = 300;//timeoutseconds limit$h#Pq:{#pQDs0c
//get the current time4_2\L o,G&C4Kf)A!^
$timestamp = time();J tI*d6`lec
//calculate the lowest timestamp allowed
a3t!]N-JB8DE $timeout = $timestamp-$timeoutseconds;

a!@F?%u6BR+a/d ?>连接mysql@!f&c YU"R
mysql_connect('localhost', 'username', 'password');也允许使用变量形式。
2X/v)e;k |k4}O.X3yO mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接w d.Aj/BI
mysql_connect($server, $db_user);查询数据库的代码：OC+U mGF6X.X i[
mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。
d!wD@;Md)A
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES0qh+Ds"I%?2p
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");K5BL R5]j;u#F
如果用户用错误信息的话，这样处理。-k(K9R]EDb
if(!($insert)) {
G[1{nvR2hwN*f(r9g.B print "Useronline Insert Failed > "; J2T2c mcd6IwcG
}然后实现当超过设置的时间就删除该用户记录。
q+y f$H9f bi^Y $delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。B&ppgdJ9j
if(!($delete)) {MjVm4f#uMrW
print "Useronline Delete Failed > ";
x!NW4VjCO` }下面我们解决数据库中不同IP的问题~;S"T(YL{7z
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用 @\,S Q
C/a%?+c'w
mysql_num_rows(query);来统计用户，代码如下。"SStq(as
$user = mysql_num_rows($result);最后关闭数据库。{(g]E k1t~9w~
mysql_close();显示在线的人数。/i-Bc0zUF k
if($user == 1) {I]G t%zk w
print("1 user online\n");
iZb6b2o8L2F5Y } else {

h(V8|/t)A4p;g[&V;C print("$user users online\n");/jP/C!~ Y;o&r
}最终把上面代码写成一个PHP文件如下。
&l~NQ+?ZI[#P <?php
:Mp}.@g$E0PV-wP //Put your basic server info hereCX/p0q[
$server = "localhost"; //normally localhost"Wyo7}ms*ZNY7r
$db_user = "root"; //your MySQL database username!t uLF)S;K7}
$db_pass = "password"; //your MySQL database password
nv;LUZ(@ $database = "users";$e"YEM6_~H
$timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably areZz!rQ8W|3lq4o/aNu-I
// offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last
l#EZ3l@_1]2j c // $timeoutseconds seconds)
sLd
AS0FN#?8Q
Cw //this is where PHP gets the time
cl
?,L2I-J $timestamp = time();
.V@YS*i9d //counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed
-Li4J U)}ev $timeout = $timestamp-$timeoutseconds;
(?P?&LY //connect to database
_)KM+N^6A mysql_connect($server, $db_user);
#sA;\vK3[ //add the timestamp from the user to the online listN6pC&o0@:D
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES
c0lEHVq.m-@i ('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");&CU,{ X(d
if(!($insert)) {
jXb4b e%d.r print "Useronline Insert Failed > ";AwVSVpq'k}f%d
}
9u&s4loUQ*x p //delete the peoples which haven't been online/active in the last $timeoutseconds seconds.\g!A;H$@/|)S
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");KINENP
if(!($delete)) { x6jFSq tE
print "Useronline Delete Failed > ";
.O#X?p(LP%a"d{ }
k#VV}A'zu7{1s //select the amount of people online, all uniques, which are online on THIS page
d2jL.^|e $result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");+xb&L FBoS EDj
if(!($result)) {
I"N#L~bk~0F%U print "Useronline Select Error > ";:{Bya)f8aG
}
7WG]JI/y //Count the number of rows = the number of people onlineA T5?2j#`&hP[0u
$user = mysql_num_rows($result);vA}0r6P3mn|
//spit out the results
c1M@KV
eV;wb5g mysql_close();
6{5qc6|x[$ZI if($user == 1) {c#\%Hg c
print("1 user online\n");7aC)YXR
} else {
*u0B
X}
p$G)y print("$user users online\n");
b}P.S$G1a0J }
2W7F(O/}ND)Wa ?>
7IK!e)y9G*rz^ [url=http://www.now.cn/vhost/][img]http://b.todayisp.com/bbs/760x90h.gif[/img][/url]
"I)F@yV{S H 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。
?;\GB!x ^ 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。
5btS%m+y;q 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。
1@d5MU6yWOT 当然啦，这两款主机也是相当不错的。
)B)P9Hu(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
/[(^Rj,ja 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

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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](IVV5p?4\ {
自己加QQ去问吧。

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