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！( a0 K4 a) T7 |( V9 |
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- z; D' k
首先我创建MYSQL数据库表。$ G% y2 ^+ f* Z
CREATE TABLE tablename (
field type(max_length) DEFAULT 'default_value' (NOT) NULL' P# U+ v" O( r
}可以使用的SQL语句。
CREATE TABLE useronline (- g& R# m* ]# w' ^
timestamp int(15) DEFAULT '0' NOT NULL,6 S% L: v4 Y1 [8 e' s% }% \' ~
ip varchar(40) NOT NULL,
file varchar(100) NOT NULL,1 V1 `( _' S" f/ b9 N) E/ A
PRIMARY KEY (timestamp),
KEY ip (ip),6 Q, @9 {7 F4 L4 M! R0 d1 }
KEY file (file)- S0 n- M+ ~6 r# _+ S5 U
);下面我们是PHP脚本，首先我定义MYSQL的信息。5 a* q+ i6 H* O0 I% x
$server = "localhost"; //你的服务器
$db_user = "root"; //你的mysql的用户名# V6 I1 L3 O, }
$db_pass = "password"; //你的mysql的密码5 S+ X9 e5 w3 t# \' \* v" x
$database = "users"; //表的名字设置统计的时间(多少秒内在线人数)% w9 Z4 a2 Q% e0 m, @
$timeoutseconds = 300;取当前时间。
$timestamp = time();上面的完整代码：. m  K7 E9 J* K9 j: u1 }
<?php" \" n- f) V9 z( g! M0 r
$server = "localhost"; //your server
$db_user = "root"; //your mysql database username
$db_pass = "password"; //your mysql database password if any
$database = "users"; //the db name/ O! B5 `5 q$ g8 E4 V5 F( P
$timeoutseconds = 300;//timeoutseconds limit
//get the current time" h9 V) ^5 o& m3 d( o
$timestamp = time();8 i; o# s" g2 ~: f0 j" r
//calculate the lowest timestamp allowed7 l2 D2 R6 T$ E% b8 H# F
$timeout = $timestamp-$timeoutseconds;. X6 F' I, h- O
?>连接mysql6 E- y& }% k5 b, V1 u
mysql_connect('localhost', 'username', 'password');也允许使用变量形式。  d0 M; K  M; [
mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接2 y) k( `* q' l# b+ S2 F& y
mysql_connect($server, $db_user);查询数据库的代码：# c. q& }6 `. ]% X& H3 V+ L/ i
mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES4 T: l- n9 q7 W
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
如果用户用错误信息的话，这样处理。2 C  }: W. j8 Y( c- m
if(!($insert)) {
print "Useronline Insert Failed > ";
}然后实现当超过设置的时间就删除该用户记录。) L: k7 S' Z- K9 p
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。+ o( Q. w/ p% R$ H. |
if(!($delete)) {  [5 x& G' G8 d3 k, t1 r. U& p; v
print "Useronline Delete Failed > ";
}下面我们解决数据库中不同IP的问题/ ?; f( R) j, Y
$result = mysql_db_query($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。
mysql_close();显示在线的人数。
if($user == 1) {
print("1 user online\n");# Q+ L  S: ?5 v5 \+ X2 Z
} else {
print("$user users online\n");
}最终把上面代码写成一个PHP文件如下。% p: z! v( _6 v9 S0 F
<?php9 J8 O: B$ Y; Q+ A3 E: v  Q
//Put your basic server info here
$server = "localhost"; //normally localhost
$db_user = "root"; //your MySQL database username% q8 u8 b8 M- p# A: L$ E
$db_pass = "password"; //your MySQL database password
$database = "users";
$timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably are
// offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last
// $timeoutseconds seconds)* _) e4 Z- ^5 i( z  r/ S
//this is where PHP gets the time9 Z  u* p5 L: I# c! S
$timestamp = time();) W+ J/ o; i& g# U: ^) r: P
//counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed( Y% R1 w# s: U) O9 Z7 k
$timeout = $timestamp-$timeoutseconds;7 x; X9 a+ d. \& e
//connect to database
mysql_connect($server, $db_user);1 I6 _3 [% A* ]
//add the timestamp from the user to the online list" R  S. z* Z* J* A5 L
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES3 L6 a3 V" R. q5 n. }
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
if(!($insert)) {! |# _5 g2 d+ X3 y7 ]
print "Useronline Insert Failed > ";  M/ S! Q0 e; l& M
}
//delete the peoples which haven't been online/active in the last $timeoutseconds seconds.1 K3 ^7 x$ V) p# H: A
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");5 y& D$ `: Z4 h: A
if(!($delete)) {/ Q, ?' n( C8 r
print "Useronline Delete Failed > ";2 p  B6 \' r% w! ?
}) D' |; n7 ~: E  U
//select the amount of people online, all uniques, which are online on THIS page: r# v) ~" g9 ~
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");
if(!($result)) {' g8 P6 r6 G, Z
print "Useronline Select Error > ";
}
//Count the number of rows = the number of people online
$user = mysql_num_rows($result);/ o0 e' _2 ?' z5 I, X
//spit out the results9 p0 F' G6 h$ l; k4 I! h4 w3 q$ `
mysql_close();
if($user == 1) {; H3 Z" j7 h2 l& v
print("1 user online\n");
} else {
print("$user users online\n");
}8 r$ v  d6 ?; p7 H
?>8 K6 U( o! G% E- d* k4 p

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。3 y8 s+ P" r( m9 j2 i
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。
当然啦，这两款主机也是相当不错的。7 q- l8 e0 w! a1 e
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. i2 q: G4 t9 }) {% \
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+ r- o6 W _8 X% W4 e7 @* p
提供一下这个公司的联系方式：请见：http://www.now.cn/vhost/
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) o' Z# |/ Z0 L$ t( @
自己加QQ去问吧。

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