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。5 ]) S- v( l: g
首先我创建MYSQL数据库表。
CREATE TABLE tablename (
field type(max_length) DEFAULT 'default_value' (NOT) NULL
}可以使用的SQL语句。
CREATE TABLE useronline (
timestamp int(15) DEFAULT '0' NOT NULL,
ip varchar(40) NOT NULL,% O0 u" A4 v- f7 }5 z
file varchar(100) NOT NULL,
PRIMARY KEY (timestamp),* k9 T. r6 W( _& O) [/ Y( M$ u
KEY ip (ip),
KEY file (file)
);下面我们是PHP脚本，首先我定义MYSQL的信息。4 I2 s) ^0 A- G% g) z. C' e1 [
$server = "localhost"; //你的服务器
$db_user = "root"; //你的mysql的用户名$ b8 K( t! q+ T% m! R$ }
$db_pass = "password"; //你的mysql的密码8 O; J3 Y' q, i
$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。! D7 t- A# N" u" @. D% ^
$timestamp = time();上面的完整代码：1 X; M/ V" e/ S; e4 R
<?php
$server = "localhost"; //your server; K  \' o7 F8 E6 u) ^/ j
$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();
//calculate the lowest timestamp allowed
$timeout = $timestamp-$timeoutseconds;
?>连接mysql/ ]+ D* D9 t% I& X" V+ E
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：2 |/ ~5 z6 A1 G% }" k
mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。+ z/ E. l% i) D% z
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES# O% J, C% n3 M. J& w6 m3 M
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
如果用户用错误信息的话，这样处理。
if(!($insert)) {0 T/ v; ?4 o' y
print "Useronline Insert Failed > ";
}然后实现当超过设置的时间就删除该用户记录。/ Y5 t8 G1 e9 w: G9 X
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。4 `- d6 f7 L9 S0 j0 Q# Y- e
if(!($delete)) {1 a. l) I, I% G3 V! B4 a, ^
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
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。( Z7 f! h3 k. v
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。
<?php
//Put your basic server info here1 t3 z" N7 U6 q- M: |4 e2 i
$server = "localhost"; //normally localhost& O1 e4 ]. t9 ~
$db_user = "root"; //your MySQL database username1 p5 v/ x" w0 S( Y$ j1 s
$db_pass = "password"; //your MySQL database password
$database = "users";+ W: Q3 j' T) F& [$ q( t" n
$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' j0 _  J4 c6 R
$timestamp = time();% E2 y& z7 Z% S2 a1 e* k
//counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed# t0 R( t' f4 C7 R- \
$timeout = $timestamp-$timeoutseconds;
//connect to database
mysql_connect($server, $db_user);( [' V7 \+ M. j/ O' l
//add the timestamp from the user to the online list
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES' A, \9 R+ k" a5 `, q2 J
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
if(!($insert)) {% n% E6 e: G7 }2 ~
print "Useronline Insert Failed > ";# k8 W5 c/ P* a) [
}/ N; r' @! m: x) U3 ~/ h: p
//delete the peoples which haven't been online/active in the last $timeoutseconds seconds.; K9 G+ _( p& m4 A9 S
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");& ~# y/ o. Y4 F# r- l  j
if(!($delete)) {7 {4 `8 O. d, @5 X3 t- N+ z/ s  C
print "Useronline Delete Failed > ";: @' j$ e# G* ~8 p. L
}
//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='".$_SERVER['PHP_SELF']."' ");$ i2 W$ x1 ]. [* A$ n  P7 D
if(!($result)) {
print "Useronline Select Error > ";
}
//Count the number of rows = the number of people online
$user = mysql_num_rows($result);* Z2 W" I- p4 b  Y6 g; Y
//spit out the results9 b8 h7 m5 c2 V! l5 w& L* d
mysql_close();
if($user == 1) {
print("1 user online\n");" ~! j4 k7 }. e% d$ V
} else {
print("$user users online\n");" |1 z+ ^& \9 I& v. q& ]8 O$ f
}
?>1 o; D1 d+ D, O5 O& Z

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。' Y v! y' I6 x0 a
当然啦，这两款主机也是相当不错的。3 {9 E+ Q- `0 c7 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0 b7 B+ U; E& `0 K8 Q/ R
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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