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。
首先我创建MYSQL数据库表。, ?! W/ U, J; h8 ^5 I
CREATE TABLE tablename (
field type(max_length) DEFAULT 'default_value' (NOT) NULL5 N: D7 R+ O# L" X
}可以使用的SQL语句。
CREATE TABLE useronline (
timestamp int(15) DEFAULT '0' NOT NULL,  C8 x' N8 u' r( `
ip varchar(40) NOT NULL,
file varchar(100) NOT NULL,
PRIMARY KEY (timestamp),
KEY ip (ip),( h/ w( U1 M3 k0 D
KEY file (file)
);下面我们是PHP脚本，首先我定义MYSQL的信息。0 W* g$ o  V1 p6 Z) r& L
$server = "localhost"; //你的服务器
$db_user = "root"; //你的mysql的用户名6 i6 S; H2 [7 U8 ]
$db_pass = "password"; //你的mysql的密码. \$ ^* r2 \% @% n7 R
$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& K! I- R3 z2 q0 d4 W
$timestamp = time();上面的完整代码：
<?php
$server = "localhost"; //your server
$db_user = "root"; //your mysql database username1 t; P1 A0 J4 V7 C
$db_pass = "password"; //your mysql database password if any
$database = "users"; //the db name/ _7 ?8 Z2 Y5 F, N$ o
$timeoutseconds = 300;//timeoutseconds limit/ W5 Y3 S! ?" v4 f6 A% ]$ j
//get the current time4 T! N4 K  L2 N. ^" }
$timestamp = time();  |+ k7 P6 N: A
//calculate the lowest timestamp allowed" m) G' f6 {9 y3 h
$timeout = $timestamp-$timeoutseconds;, Z/ M, D9 [& k* c; a  |& P! W/ \: C
?>连接mysql6 F. p8 D+ ~9 M$ b& D' T- c; D
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, $db_user);查询数据库的代码：7 a4 _5 ?: |! T* C1 O$ n
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 VALUES
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");- K  u( l5 p& M, H4 p. I
如果用户用错误信息的话，这样处理。2 ^$ [: F! C1 [1 V8 V; Q
if(!($insert)) {8 x0 U% X/ i1 F# r  o# {, S
print "Useronline Insert Failed > ";
}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<$timeout");同样给出删除记录出错的处理。" }4 J3 J& C" o
if(!($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, A# [8 R+ I- Q( u
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。# u- J' u- J/ F
if($user == 1) {/ }$ Y) O" \2 j1 g, }9 i
print("1 user online\n");
} else {8 v* V. f) l" a4 \: }
print("$user users online\n");
}最终把上面代码写成一个PHP文件如下。
<?php4 j% i6 }) k5 D
//Put your basic server info here
$server = "localhost"; //normally localhost' ^) ^9 h- n9 a" m5 D* C2 E1 G
$db_user = "root"; //your MySQL database username  {; o/ h* l" l' E* Z9 ?3 M3 C
$db_pass = "password"; //your MySQL database password
$database = "users";
$timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably are; w* X# |' L' V5 c0 K
// 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();
//counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed
$timeout = $timestamp-$timeoutseconds;
//connect to database9 o/ h, d2 a5 y. R1 b8 X0 Z1 \
mysql_connect($server, $db_user);
//add the timestamp from the user to the online list6 `8 l( S6 ~( @& p4 n
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES% n  @6 C1 |6 g3 d
('$timestamp','".$_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.* N3 S' B& c6 ~
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");
if(!($delete)) {
print "Useronline Delete Failed > ";: J( E: N8 l/ S$ H8 z/ e( M8 I, Z
}
//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='".$_SERVER['PHP_SELF']."' ");# H# w) T7 P$ B1 G& p( D9 d; U
if(!($result)) {
print "Useronline Select Error > ";
}( Q+ K2 y2 Y1 [/ \! L" }+ m' W
//Count the number of rows = the number of people online6 [7 q2 j; P0 }' F1 f! A' n
$user = mysql_num_rows($result);# k% `7 x4 X# S- F( L1 N5 o
//spit out the results
mysql_close();
if($user == 1) {
print("1 user online\n");
} else {
print("$user users online\n");( R6 _! v: P) g
}$ b6 t' \/ w: j; m! [
?>

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。9 Z2 i: A" X; J5 ]
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。7 X. i% V" q' B2 F0 ~4 u6 ^5 X
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 l, O- L/ e0 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
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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