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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！kT0zoYZ*[z
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。8{}j l
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首先我创建MYSQL数据库表。1D*iu(MM8G
CREATE TABLE tablename ( Lz.S#c[d
field type(max_length) DEFAULT 'default_value' (NOT) NULL
%j3n6?7n `;j"C)_p+h
@ }可以使用的SQL语句。+khUA&i
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CREATE TABLE useronline (
d,b3lEx|5B timestamp int(15) DEFAULT '0' NOT NULL,bq(inv[lJQ*_
ip varchar(40) NOT NULL,8Dq7^!c D
file varchar(100) NOT NULL,(BA7jW+UG[;{
PRIMARY KEY (timestamp),-Cly)r]t
KEY ip (ip),
}Zeyx N;O KEY file (file)

gz(hw
l9r );下面我们是PHP脚本，首先我定义MYSQL的信息。
WZ,V!E1~5ZBq$V $server = "localhost"; //你的服务器 A#YM-|ygjq,n
$db_user = "root"; //你的mysql的用户名
h"yB9y'Um k&_R2s] $db_pass = "password"; //你的mysql的密码
T5E#w Sly;} $database = "users"; //表的名字设置统计的时间(多少秒内在线人数)
cOk2z%y7d0L $timeoutseconds = 300;取当前时间。
g$A.Tg|8uEE*~Q $timestamp = time();上面的完整代码：g3dyknfB;B)\
<?php
e!Xj^Y^e8| $server = "localhost"; //your server {&i"Vt2Z.s qp0J
$db_user = "root"; //your mysql database username
kU4G"lz1n_ $db_pass = "password"; //your mysql database password if anyl,o_$v6U j
$database = "users"; //the db name
'l;K"|+F0R $timeoutseconds = 300;//timeoutseconds limit"u3r!p1znXI
//get the current time
M4Dp:XAG| $timestamp = time();3fn&kxw
//calculate the lowest timestamp allowed5F.U.E\*DVOXrC
$timeout = $timestamp-$timeoutseconds;
.?^ RDTw T)h`8y ?>连接mysql'a y;BF2c/]%@W
mysql_connect('localhost', 'username', 'password');也允许使用变量形式。
[T:C? S mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接
hR@ U([7} @4R_ mysql_connect($server, $db_user);查询数据库的代码：_8^!P)MB
mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。\yO9]y
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES HW4?V@h L,L
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
MIE\JZC 如果用户用错误信息的话，这样处理。
oK4L*r/ar'^ if(!($insert)) {n]^ h#^hO
print "Useronline Insert Failed > ";
$jD2t i)J*h-B)H3@f fx }然后实现当超过设置的时间就删除该用户记录。nB"s(w*W,j
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。^&f1Mv"b[yx9?
if(!($delete)) {
YV@8U:X2K9r print "Useronline Delete Failed > ";HC+aJ5|#B#V!o7s
}下面我们解决数据库中不同IP的问题`pZ#h/i;f/a
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用
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L4u8^ n(naq:S)~ mysql_num_rows(query);来统计用户，代码如下。
hN5|w],Yg7Xb"umG $user = mysql_num_rows($result);最后关闭数据库。
6R+|]a F#c8S#P mysql_close();显示在线的人数。1d"W9a#B9S;e+St
if($user == 1) {
&b;Vw&R]?4q%o5D print("1 user online\n");
8i+jEeE4ff5`p`
S } else {
K4^u[$QaQ v a print("$user users online\n");%G C&n2rg)D-vp
}最终把上面代码写成一个PHP文件如下。)SR/Q:l(ob"sa}_
<?php
xvO*m1HjGe7Ni7p //Put your basic server info here
[:kvKD3e $server = "localhost"; //normally localhost
i#U e~m-{6r;A'B
$db_user = "root"; //your MySQL database username
o@ZF~X7FW $db_pass = "password"; //your MySQL database password
ET?%H'\8e?,~%I@ $database = "users";
4A+\)l7jd $timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably are4U6e [W3D:f
// offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last
f2JM"VqS // $timeoutseconds seconds)
$[-lDL}uf //this is where PHP gets the time
sZP dd};c $timestamp = time();J7l;{?@ Lm
//counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed-o
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$timeout = $timestamp-$timeoutseconds;)Oy u9l6s!|:Ss$[/p;~){
//connect to database9sU\ X9c.H(?v~
mysql_connect($server, $db_user);&voLE6LR:].O
//add the timestamp from the user to the online list
~!CQ6lyF @`4O $insert = mysql_db_query($database, "INSERT INTO useronline VALUESbV5^(U'c)G/j
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");A:b-t op y(mLS$fgn
if(!($insert)) {
D-np,b.O] u print "Useronline Insert Failed > ";vD[!Xh
}5p0{m,YE
//delete the peoples which haven't been online/active in the last $timeoutseconds seconds.E3n?8`_~(K`6l^!g
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");
r
A$XL.@,pWv5c if(!($delete)) { t&i&O?J*?e
print "Useronline Delete Failed > ";
/Y"}t
`4tX@rv }
^uK!g9\ //select the amount of people online, all uniques, which are online on THIS page
E N3?VeH $result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");;S? X*Q8W
if(!($result)) {Mh3u%h;{Ai
print "Useronline Select Error > ";P%nNJM"v5Z
} J`*K'@K-I$f y&RRZ
//Count the number of rows = the number of people online
0S3N/H ~P|(v $user = mysql_num_rows($result);&F*kM{#C"T7W
//spit out the results]^J!H E
mysql_close();
K!i&W0D3cPWx
O#k6x if($user == 1) {{:L)kg3Wb#]
print("1 user online\n");
nk-HVV[/?'f1JP4x } else {+q%w&`|L
print("$user users online\n");+[;}*l;|5m
}
$LC};fqo [-v ?>
r[X^&V3~]1i] [url=http://www.now.cn/vhost/][img]http://b.todayisp.com/bbs/760x90h.gif[/img][/url]S)e7wX6@AE3]
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。
1k)I#t6d8N\ f 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。L*dI3a6t#e
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。Ma\} sVP(@f.J
当然啦，这两款主机也是相当不错的。
,G;B^7b!OW0G.MW-k 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C1zX0V0aBb
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 j.I:B]Khm
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 ^'{(Cp&Y
xH"jr
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]%Aj MP&Kt
自己加QQ去问吧。

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