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。3 S# L2 {# A7 m. b$ }" Q
首先我创建MYSQL数据库表。% z! b$ L8 _  Q
CREATE TABLE tablename (
field type(max_length) DEFAULT 'default_value' (NOT) NULL
}可以使用的SQL语句。
CREATE TABLE useronline (# }3 d1 w+ ?& Q; d% s' g5 \
timestamp int(15) DEFAULT '0' NOT NULL,
ip varchar(40) NOT NULL,* L1 r- Y; b. O+ Z: f+ L
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。8 y+ [7 H7 ^" h' p* O
$server = "localhost"; //你的服务器* l* P# l0 @: H5 [5 d  K+ W7 V/ G' U
$db_user = "root"; //你的mysql的用户名% E( A  X: x& E3 X* e
$db_pass = "password"; //你的mysql的密码5 c* B& w+ @* M( w% ]% B
$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。, v) ~7 Y/ Q7 X, c8 Q  A( m. t
$timestamp = time();上面的完整代码：" W4 G. {  ^0 d, W) P" v
<?php
$server = "localhost"; //your server
$db_user = "root"; //your mysql database username; r' D  z1 q3 w+ F3 W; t! H
$db_pass = "password"; //your mysql database password if any7 @. n& @/ P# |. V4 L" }5 t& z
$database = "users"; //the db name
$timeoutseconds = 300;//timeoutseconds limit
//get the current time$ ?5 ]( Q7 v, R+ v5 n
$timestamp = time();! }: z( `6 G, F! C: N
//calculate the lowest timestamp allowed- Q$ t- P8 d# r2 W1 r
$timeout = $timestamp-$timeoutseconds;
?>连接mysql6 m! `( F3 u4 D
mysql_connect('localhost', 'username', 'password');也允许使用变量形式。' D7 Z6 H# _; z) q
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：8 M) C) \) ^8 K: O8 L  G
mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。# Z- j3 x$ s6 `9 l4 r6 M; g
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
如果用户用错误信息的话，这样处理。
if(!($insert)) {
print "Useronline Insert Failed > ";. l2 p3 F* Z0 S5 f9 u, Z# A
}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<$timeout");同样给出删除记录出错的处理。5 x+ G( g. H! u$ |9 C* }! Q- N, ~) F
if(!($delete)) {
print "Useronline Delete Failed > ";
}下面我们解决数据库中不同IP的问题
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用+ L0 ]$ d9 d8 R- \
mysql_num_rows(query);来统计用户，代码如下。  {8 o; O" Q1 z  O7 \) V" x" n
$user = mysql_num_rows($result);最后关闭数据库。( l& p5 T% }  A! |6 ]
mysql_close();显示在线的人数。/ v( v; ~2 ?, k* `7 t) V6 G. Y
if($user == 1) {  a  W2 t' y* ~; i+ F
print("1 user online\n");
} else {4 N& o- Z2 A  w) z$ ^1 n
print("$user users online\n");5 g9 }2 g. j! c* v) Q
}最终把上面代码写成一个PHP文件如下。
<?php  b1 T; D0 _/ J+ D7 T4 w
//Put your basic server info here' r! \, h' ?# W& T& U
$server = "localhost"; //normally localhost9 r3 Q/ ^$ ]3 x: P
$db_user = "root"; //your MySQL database username
$db_pass = "password"; //your MySQL database password: ?3 I9 X4 I* c5 U8 ]6 k# m+ x
$database = "users";4 k5 S8 W% [' p! {7 f0 u+ j
$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();4 a; K! s8 C2 h8 `& e
//counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed
$timeout = $timestamp-$timeoutseconds;
//connect to database
mysql_connect($server, $db_user);8 F+ j" p0 \3 u; {/ l
//add the timestamp from the user to the online list( H! q6 u' Y! w! g
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
if(!($insert)) {
print "Useronline Insert Failed > ";
}
//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 > ";
}
//select the amount of people online, all uniques, which are online on THIS page9 }/ D: x7 ?  o7 M
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");
if(!($result)) {
print "Useronline Select Error > ";
}
//Count the number of rows = the number of people online
$user = mysql_num_rows($result);# e0 u0 {6 C) J1 S& \6 h# V
//spit out the results. X4 V( i) l. q+ B
mysql_close();) T, R$ c/ }9 C& k
if($user == 1) {7 q6 I" @: n' c$ l  P* X; J
print("1 user online\n");: _3 x2 U+ c0 E# F2 k
} else {( n2 X% `8 j  A* e  e3 W
print("$user users online\n");/ Z+ n- ]# a( I, m# l
}
?>1 z5 H7 f4 L" u6 P* j2 R

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。0 a* O- |# E# M3 w
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。" V8 s2 y; L) b) m/ Q4 ^5 q
当然啦，这两款主机也是相当不错的。+ v# I! a& S5 f% e* 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; X/ ?: L9 g: i( l  [+ d7 |
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2 w  T2 k& d# s9 A4 @2 {; q
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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刚用PHP写了一个网站在线人数的程序，请大家进来指点下！

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