刚用PHP写了一个网站在线人数的程序，请大家进来指点下！

主机, 虚拟主机

刚用PHP写了一个网站在线人数的程序，请大家进来指点下！9 K: O% c! b6 L: j
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。9 H1 w! ^* v. s1 @  ]! q
首先我创建MYSQL数据库表。
CREATE TABLE tablename (
field type(max_length) DEFAULT 'default_value' (NOT) NULL1 _, m* F0 ?, G' c) \# V
}可以使用的SQL语句。
CREATE TABLE useronline (
timestamp int(15) DEFAULT '0' NOT NULL,& H. A2 O+ ?6 z2 E* H% C. H8 k
ip varchar(40) NOT NULL,8 I# t0 _- @" [8 ~7 |6 F# l
file varchar(100) NOT NULL,
PRIMARY KEY (timestamp),! r5 W  d# V8 z$ _; A( @" s
KEY ip (ip),) q% ]5 ^" j4 |% d+ s, M  I
KEY file (file)2 M, a( c# m$ ?/ W3 H8 |! D
);下面我们是PHP脚本，首先我定义MYSQL的信息。8 O" `3 E5 m3 Z: n; a- i
$server = "localhost"; //你的服务器
$db_user = "root"; //你的mysql的用户名6 t0 r% e, Q' e- O5 Z
$db_pass = "password"; //你的mysql的密码, r8 y& \6 ^8 b" Z
$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。
$timestamp = time();上面的完整代码：
<?php0 @& y- [% v/ _
$server = "localhost"; //your server) S7 i( P/ H0 e* e  v: A
$db_user = "root"; //your mysql database username4 s) q+ e* Q1 V- Q
$db_pass = "password"; //your mysql database password if any
$database = "users"; //the db name
$timeoutseconds = 300;//timeoutseconds limit
//get the current time0 I3 S6 Y- f" |, K
$timestamp = time();
//calculate the lowest timestamp allowed) J& J$ A# \3 c  K: g
$timeout = $timestamp-$timeoutseconds;% _  [/ i  N4 V& n3 g5 Y6 p: ~3 s
?>连接mysql
mysql_connect('localhost', 'username', 'password');也允许使用变量形式。: W! o* K! d2 B. W# `1 x5 K& c
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：( H  i9 U% U% ]- o' H3 }) Z
mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。  W+ h5 n" n7 C2 [, I. b
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES9 P: K% ]( I" l1 a# L
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
如果用户用错误信息的话，这样处理。
if(!($insert)) {1 ^; Z& f5 V5 T7 g
print "Useronline Insert Failed > ";
}然后实现当超过设置的时间就删除该用户记录。$ M& P3 K- V2 P
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。; G7 n* _9 o& X
if(!($delete)) {0 v9 M' }, e9 g( L6 V  F
print "Useronline Delete Failed > ";
}下面我们解决数据库中不同IP的问题9 ^+ P2 O; M/ r/ y/ N
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用
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。. R' e# w6 W3 O
mysql_close();显示在线的人数。% h5 Y5 O( d) y4 i) l
if($user == 1) {
print("1 user online\n");- U( t1 ]% B% d
} else {
print("$user users online\n");
}最终把上面代码写成一个PHP文件如下。
<?php% ~, |( i; @$ R' N7 }0 T
//Put your basic server info here9 ?1 m. w6 X2 R! F7 }6 X. D$ l
$server = "localhost"; //normally localhost: D9 P% ~" p, C! O
$db_user = "root"; //your MySQL database username5 Y- c$ x3 q3 W/ A* E% Y
$db_pass = "password"; //your MySQL database password
$database = "users";
$timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably are: L( M# }7 _4 C' ^1 L% C  D
// offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last1 A  [0 e1 q$ Z: F' z4 @- b
// $timeoutseconds seconds)# u. ~, Y* p& }) S0 L# Q2 _
//this is where PHP gets the time1 v5 r- x3 p5 n- i, |2 a7 O
$timestamp = time();: P9 p. P. L3 A" `% k, B: S
//counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed) M  l2 R7 i9 [# B6 y: o+ ~
$timeout = $timestamp-$timeoutseconds;- ^( k, O7 ?0 Y/ l8 s4 ]4 t
//connect to database
mysql_connect($server, $db_user);% K& _  e; c) F: I  X( f: _3 R% `5 R
//add the timestamp from the user to the online list% O. q' w) H) {/ R
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
if(!($insert)) {
print "Useronline Insert Failed > ";" C, x' L% o, P- T; }
}; E" X- P( O' L* a
//delete the peoples which haven't been online/active in the last $timeoutseconds seconds.
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");
if(!($delete)) {
print "Useronline Delete Failed > ";
}) Y1 C! j, S* ?0 r8 t
//select the amount of people online, all uniques, which are online on THIS page& y& y. \$ V2 j9 y
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");1 x. X  Z8 V6 X5 R3 v
if(!($result)) {
print "Useronline Select Error > ";2 F7 L) z" R* u) K
}: G7 g7 H- {3 e' ?
//Count the number of rows = the number of people online
$user = mysql_num_rows($result);
//spit out the results
mysql_close();+ Q1 m) h1 W( g& @
if($user == 1) {7 f/ G+ L8 N) _+ u% y5 u" X
print("1 user online\n");
} else {
print("$user users online\n");! `  d6 t  Z, B8 y( b' s5 ]
}
?>" `0 D+ `7 Y1 {$ j  j- a2 H: q

2 y+ H8 g7 X; o$ `. B
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。
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。0 H n; x9 F1 h$ Z4 l* u
当然啦，这两款主机也是相当不错的。$ V9 w+ x; e! M% n" y
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9 ?( Z/ O6 K6 ]) N2 k. ]
提供一下这个公司的联系方式：请见：http://www.now.cn/vhost/ 0 t2 C6 t2 M5 I- _
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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