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！
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。( j6 o6 c% \' g% h/ }5 j
首先我创建MYSQL数据库表。
CREATE TABLE tablename (. k/ n' v; a/ l: K) W- S4 I# J% m
field type(max_length) DEFAULT 'default_value' (NOT) NULL* x! w5 C  D/ t: ~$ R
}可以使用的SQL语句。' B1 v. Y6 J+ ?) j' {, g% v
CREATE TABLE useronline (- h! M" p! j1 d6 z$ n% h/ |5 X0 O5 o
timestamp int(15) DEFAULT '0' NOT NULL,
ip varchar(40) NOT NULL,
file varchar(100) NOT NULL,
PRIMARY KEY (timestamp),
KEY ip (ip),
KEY file (file)
);下面我们是PHP脚本，首先我定义MYSQL的信息。
$server = "localhost"; //你的服务器7 g3 o! w/ Z# i+ z9 y8 _
$db_user = "root"; //你的mysql的用户名5 t% w5 x/ }7 o/ u2 |* O( j
$db_pass = "password"; //你的mysql的密码" |* B0 D( j' l
$database = "users"; //表的名字设置统计的时间(多少秒内在线人数)
$timeoutseconds = 300;取当前时间。6 H; O  B4 F$ Y3 z; T/ m4 }9 v
$timestamp = time();上面的完整代码：" u' S+ ?& q6 N" p
<?php8 B' V1 i) \1 n' W% H
$server = "localhost"; //your server1 f& s! A8 i+ F: a' p$ V2 z5 K5 P
$db_user = "root"; //your mysql database username
$db_pass = "password"; //your mysql database password if any
$database = "users"; //the db name
$timeoutseconds = 300;//timeoutseconds limit
//get the current time
$timestamp = time();1 S1 T" F+ f3 ^5 g2 j1 X
//calculate the lowest timestamp allowed
$timeout = $timestamp-$timeoutseconds;3 e- [! a2 z, }* }
?>连接mysql& j$ h7 Y% \9 m4 Q3 A, y1 t
mysql_connect('localhost', 'username', 'password');也允许使用变量形式。
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：
mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。8 _4 K; ~. I' Z/ ?. S
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES+ |9 u' h! O& v( h, h
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");6 w1 \' I) p; X  W9 d: A
如果用户用错误信息的话，这样处理。! d# Y1 s. {! Z- q! B
if(!($insert)) {4 T+ K. }. a4 |! }: T
print "Useronline Insert Failed > ";
}然后实现当超过设置的时间就删除该用户记录。7 Z- v* k; ^; F- \9 G
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。
if(!($delete)) {
print "Useronline Delete Failed > ";
}下面我们解决数据库中不同IP的问题3 z2 r" x% x: m3 A) A1 F; Z6 @! r
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用6 N; _' @7 z. N/ S: F
mysql_num_rows(query);来统计用户，代码如下。2 U& c4 I4 X7 d+ X2 t" V4 ]
$user = mysql_num_rows($result);最后关闭数据库。
mysql_close();显示在线的人数。7 x3 A7 F1 o- ?' Z  D
if($user == 1) {
print("1 user online\n");
} else {
print("$user users online\n");
}最终把上面代码写成一个PHP文件如下。" T$ N# E3 v/ E6 H2 D! B
<?php0 q* i0 j4 |0 ]% A5 W
//Put your basic server info here
$server = "localhost"; //normally localhost
$db_user = "root"; //your MySQL database username
$db_pass = "password"; //your MySQL database password
$database = "users";# g7 e. _1 d2 q1 u! t5 ~
$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)
//this is where PHP gets the time
$timestamp = time();( D# O7 l( [3 w$ ^
//counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed  z5 R4 r* z5 x5 a
$timeout = $timestamp-$timeoutseconds;
//connect to database  o  c' E. [9 }' v+ v
mysql_connect($server, $db_user);% r8 s& ]: D9 ~, U
//add the timestamp from the user to the online list
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");0 M) L0 U0 i4 E- p
if(!($insert)) {
print "Useronline Insert Failed > ";
}' g1 _% ?8 j- t" d( n, {  V
//delete the peoples which haven't been online/active in the last $timeoutseconds seconds.
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");. s; k2 Q% |- I2 R& _, f
if(!($delete)) {3 l* d3 I& \- U' S
print "Useronline Delete Failed > ";/ ], j' `+ F; J8 Z) d. y
}! H$ }9 _; [3 z( ]0 ~. e
//select the amount of people online, all uniques, which are online on THIS page+ \8 x3 e+ W% ?. p, ~; d/ J
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");
if(!($result)) {  m: u, S8 }/ o1 K" }0 Y1 d$ T
print "Useronline Select Error > ";
}6 j$ Z- |& _/ N4 c  [' `
//Count the number of rows = the number of people online% ^9 k  K, ]3 ~% F+ y! D+ ?2 S, Q
$user = mysql_num_rows($result);
//spit out the results  p) B  {* [- \/ b
mysql_close();
if($user == 1) {% w3 G6 }8 j6 D8 L9 p
print("1 user online\n");( p- l! e1 F8 u. t
} else {
print("$user users online\n");
}4 N1 t. K& k$ B: f5 z+ Z
?>

& _4 r& M, Q& Z" D1 T
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。) p' {7 z( v2 ~7 o% c
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。4 ?3 G$ k9 N3 ~0 k2 `( O, i: o
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* ], A: o$ l/ \/ x& ?! L) Q: x
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
自己加QQ去问吧。

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