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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！2O2Zhe%W [
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。
["p:o$u8{uE 首先我创建MYSQL数据库表。 ba v U
tSA8l:}
CREATE TABLE tablename (+T3g \|TU|6R&n*a
field type(max_length) DEFAULT 'default_value' (NOT) NULL
M*t6[3k&I0?0N:@GC }可以使用的SQL语句。Efbi,u/P;~(B
CREATE TABLE useronline ( BD/q
a-H&U!G9c+C
timestamp int(15) DEFAULT '0' NOT NULL,
(en{P^2nC5qt*Yc ip varchar(40) NOT NULL,
?rx-Je3gb.A file varchar(100) NOT NULL,` Oqo-MZF
PRIMARY KEY (timestamp),
PV7y)Sv/~ y `:yT KEY ip (ip),"h w)?#m`_*m|
KEY file (file)#sHsXH)d
);下面我们是PHP脚本，首先我定义MYSQL的信息。
0Ml$jN*~ N h"JES $server = "localhost"; //你的服务器[$u@Kfy(]
$db_user = "root"; //你的mysql的用户名BQLS#a mc
$db_pass = "password"; //你的mysql的密码
6G/Eq7Ps\;`O9AVS[u3D $database = "users"; //表的名字设置统计的时间(多少秒内在线人数)Q*LM:L'LVL T
$timeoutseconds = 300;取当前时间。
fqvG-ScnM $timestamp = time();上面的完整代码："KK4lSr^
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<?php
-S W1K)H w0d\3\ $server = "localhost"; //your server(iPU7s,M#oy6r.E:p
$db_user = "root"; //your mysql database username
hHa+ems2Fe{c)] $db_pass = "password"; //your mysql database password if any
fc H V3\0wY $database = "users"; //the db name0XMZfSN]-Q([u
$timeoutseconds = 300;//timeoutseconds limitM[P|T?o
//get the current time+PB]u`YQ|v E8z
$timestamp = time();@"W4BX3Q%N
//calculate the lowest timestamp allowed
'Y}Zhq iuP*Z $timeout = $timestamp-$timeoutseconds;
.dxn~U ?>连接mysql
0x,L ?h0L q mysql_connect('localhost', 'username', 'password');也允许使用变量形式。
m}@7{+d(g;\{/r mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接
9Ia]+oKZ$HX/s mysql_connect($server, $db_user);查询数据库的代码：,V_ ~-rAH-mXj
mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。FJ/U8?v$Ko
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES6^SmIjP
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
F\#G^O"@My 如果用户用错误信息的话，这样处理。xCC7i&c*Vaj"h
if(!($insert)) {
y&O$lA,v{ print "Useronline Insert Failed > ";:Uo @&D6? W4VN
}然后实现当超过设置的时间就删除该用户记录。"y? K:T8{"OX2F.Hb
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。
$baA5]M#i if(!($delete)) {,ZU9fX/C:`
SN!@6r`
print "Useronline Delete Failed > ";Mh!P!`c
}下面我们解决数据库中不同IP的问题
0p2XtF:Hj $result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用
1Ev3n(]k!k{ mysql_num_rows(query);来统计用户，代码如下。dQ#q-TqV-bx
$user = mysql_num_rows($result);最后关闭数据库。
&hE)O{&Yz K mysql_close();显示在线的人数。J2q:^9v0\N'T
if($user == 1) {
;x*U!Yx'T"e"P6E print("1 user online\n");
-g|^Q0|3p } else {
U0]7Gdx+R1h&m:vq print("$user users online\n");
Kj eI9d4B"BQ }最终把上面代码写成一个PHP文件如下。i}wq,Mnx
<?php
p4W Qs-q"z$f|kG/rn //Put your basic server info herez[mg0{)w'Y"Z
$server = "localhost"; //normally localhost
'`7u6g VnPh#f M $db_user = "root"; //your MySQL database username
|R3pYWI;E $db_pass = "password"; //your MySQL database password
[c`"US%vG $database = "users";
8~]*W:^Swj1L_ $timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably are
P(t3}OiB*xi} // offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last1[F1b2V%G2IM-[#B
// $timeoutseconds seconds)
M:Z%f,mq%w_5nO
//this is where PHP gets the time2l;U/S w]B
$timestamp = time();
Hxf(JI+y;Ha //counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed*`4l&}@W%Pf s
p%N"S(h
$timeout = $timestamp-$timeoutseconds;0}Fg@)z
//connect to database? s `k%Vn0Wot q0n
mysql_connect($server, $db_user);A4}#}}o-j A+C,C
//add the timestamp from the user to the online list
f"Bbb1W_ $insert = mysql_db_query($database, "INSERT INTO useronline VALUES-lk ZT%ZA
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");9R:p9NIv#R4A
if(!($insert)) {.?u$e `5NX
print "Useronline Insert Failed > ";

F:D{ Vr@j-} }
lldu,X U8R3Ij_d //delete the peoples which haven't been online/active in the last $timeoutseconds seconds.
3Y*c%A_2rF+F $delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");
,f7w4d8F`TO4_!P8d/OG if(!($delete)) {
O%_\:P[e print "Useronline Delete Failed > ";
?{!FXx0w }N4s+C-L2g3GwV
//select the amount of people online, all uniques, which are online on THIS page$Xhot7nr~
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");xT|t7Q:_~
if(!($result)) {$H$Ykk
}
print "Useronline Select Error > ";u^]0}(Fpz4|
}|D([dE6O
//Count the number of rows = the number of people online,LOzLN c&D
$user = mysql_num_rows($result);j C8G5Q'@V$@sAc q
//spit out the results3oL"kD6z7])YF
mysql_close();)z[H/Zrc
if($user == 1) {Ii j&N(A!L)^h
print("1 user online\n");
$tZ1H.yk9o4T} } else {%Dy'ZLC_ E~`
print("$user users online\n");,BGb)W ~m.g
}
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[url=http://www.now.cn/vhost/][img]http://b.todayisp.com/bbs/760x90h.gif[/img][/url]B4k(y(s0z
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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。
)h.C@ `.M(S+W4m 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。

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Y+U0ec D 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。
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u&~9C;b2?` 当然啦，这两款主机也是相当不错的。Y;Y/n2j&o'k/X j i8q\u
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
I*|wpB){1];B 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
2f&f`FS!m 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]
0|i {e1}P 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]#U#V R}7Vn Se
自己加QQ去问吧。

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