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标题: 刚用PHP写了一个网站在线人数的程序，请大家进来指点下！ [打印本页]

作者: lilcy88 时间: 2008-5-28 10:40 标题: 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！
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。# ?& l, q, Y) r, u; i+ ^, `, k4 S1 o
首先我创建MYSQL数据库表。
CREATE TABLE tablename (
field type(max_length) DEFAULT 'default_value' (NOT) NULL. Q% ^6 ~. Y' J) U1 l/ O
}可以使用的SQL语句。) \. H% c" o7 R# ~5 b1 a
CREATE TABLE useronline (4 i3 x1 T) y& R1 v' [/ o
timestamp int(15) DEFAULT '0' NOT NULL,5 w( t5 d( |5 O0 a
ip varchar(40) NOT NULL,
file varchar(100) NOT NULL,
PRIMARY KEY (timestamp),
KEY ip (ip),
KEY file (file), y: q$ J% g- `0 [
);下面我们是PHP脚本，首先我定义MYSQL的信息。3 ]/ F" R8 Q5 |8 V& A! G3 S  _! x
$server = "localhost"; //你的服务器
$db_user = "root"; //你的mysql的用户名
$db_pass = "password"; //你的mysql的密码
$database = "users"; //表的名字设置统计的时间(多少秒内在线人数)
$timeoutseconds = 300;取当前时间。3 t) U& F7 R! ^1 {
$timestamp = time();上面的完整代码：( d$ R. V! [" M/ N% p
<?php
$server = "localhost"; //your server
$db_user = "root"; //your mysql database username9 c) U" B7 Y# J4 n) Z' A6 ^
$db_pass = "password"; //your mysql database password if any6 V6 g. |+ c+ J& y' d
$database = "users"; //the db name' z( T8 O* {6 I1 Y4 s  v0 o
$timeoutseconds = 300;//timeoutseconds limit
//get the current time8 N/ y9 V" k) r2 J; P
$timestamp = time();( a& n! ?8 L& Y' e  ]
//calculate the lowest timestamp allowed0 a. i2 o8 x9 ?* E2 h% A" i
$timeout = $timestamp-$timeoutseconds;
?>连接mysql
mysql_connect('localhost', 'username', 'password');也允许使用变量形式。  i+ |! n0 l0 \+ ]8 z' w
mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接
mysql_connect($server, $db_user);查询数据库的代码：  S% k$ n' z4 O1 j
mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。5 b2 |! a# N; d# U
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");# O! I- l: t/ q
如果用户用错误信息的话，这样处理。" j( s6 q. _: F- v9 c
if(!($insert)) {8 O, K: ?. ]( I" R
print "Useronline Insert Failed > ";
}然后实现当超过设置的时间就删除该用户记录。
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。7 @. t5 P3 w* ]% C- x# r7 J
if(!($delete)) {) T( t: i* e+ K3 r  b( X. P+ G
print "Useronline Delete Failed > ";: h. n/ X. q* u5 s0 w- M  O; m8 A8 F
}下面我们解决数据库中不同IP的问题0 A  a! |! _% u1 f4 C9 Q+ S
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用% Z: ?$ W, H0 [" ]
mysql_num_rows(query);来统计用户，代码如下。
$user = mysql_num_rows($result);最后关闭数据库。
mysql_close();显示在线的人数。8 x# I% F* @. }5 m( h1 y
if($user == 1) {9 @1 V  Q- i5 \5 q7 u
print("1 user online\n");
} else {8 `, M; g2 P; D4 @" k
print("$user users online\n");7 E: o' w7 M: b* F- o8 d' x
}最终把上面代码写成一个PHP文件如下。( Z2 [1 E; s  N
<?php( p) j3 V8 R* s5 Y7 B' k
//Put your basic server info here/ s9 }2 }4 M' K. V! M/ `- H3 R
$server = "localhost"; //normally localhost; K* `0 |+ d, v- h+ e$ R/ j7 g% l
$db_user = "root"; //your MySQL database username
$db_pass = "password"; //your MySQL database password
$database = "users";
$timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably are3 a5 e$ s% E& R$ \" H  {
// offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last
// $timeoutseconds seconds)- \6 b5 e# L' O4 h+ v5 c' L
//this is where PHP gets the time
$timestamp = time();
//counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed* \, y. r4 _) D+ [! C4 h# |
$timeout = $timestamp-$timeoutseconds;
//connect to database
mysql_connect($server, $db_user);6 K2 v, M& w, [
//add the timestamp from the user to the online list
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES% c. G( Y$ o( i; y/ H2 y3 a
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");$ ?  m9 q3 p" \
if(!($insert)) {: Z- g. R- o% l) o0 S% a1 f5 N+ {
print "Useronline Insert Failed > ";! [7 G- \4 Z7 R5 g# {! M& }
}
//delete the peoples which haven't been online/active in the last $timeoutseconds seconds.
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");! r( T* y0 n9 z0 [" e
if(!($delete)) {
print "Useronline Delete Failed > ";
}* ]' h- t* ~$ z8 v: F/ y
//select the amount of people online, all uniques, which are online on THIS page
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");2 N; ?  p( W/ g. s$ z2 M) M1 Q
if(!($result)) {- v3 `% Y" j7 s/ v9 ]
print "Useronline Select Error > ";
}' q/ h8 j$ |& v- g, _& M
//Count the number of rows = the number of people online
$user = mysql_num_rows($result);0 m0 d; s6 _# _) n( f5 f, @
//spit out the results9 R" x. i; {' |5 s! G' r: ~
mysql_close();
if($user == 1) {) o2 @) m+ U: y. h6 w3 u! s
print("1 user online\n");
} else {( K/ ~8 p6 `% L5 B9 }
print("$user users online\n");+ e, h+ `2 Y! s
}
?>

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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。4 J' r  S6 C) N! a* y4 |  j
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。
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。" f/ j- d6 N; f9 f  k
当然啦，这两款主机也是相当不错的。# q; b- n, M+ p9 c* ^, a
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
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
提供一下这个公司的联系方式：请见：http://www.now.cn/vhost/ + G$ q8 X$ j# t$ z
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 http://www.now.cn/callcenter/call.net?LineName=55
自己加QQ去问吧。

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