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！! t4 t( d' H+ |; F2 P. H1 i" g. t
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。/ Z: H  H' ^" M  t: R
首先我创建MYSQL数据库表。3 r2 p1 z. f2 y6 a
CREATE TABLE tablename (
field type(max_length) DEFAULT 'default_value' (NOT) NULL
}可以使用的SQL语句。) N6 K# `) F7 M# M
CREATE TABLE useronline (4 F3 B: b. l5 k
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)$ P+ F/ O7 Z, O
);下面我们是PHP脚本，首先我定义MYSQL的信息。
$server = "localhost"; //你的服务器% U0 a% F/ R" v6 y2 W+ V
$db_user = "root"; //你的mysql的用户名: G4 b/ R; y( \
$db_pass = "password"; //你的mysql的密码
$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。. d" K' z# I/ |
$timestamp = time();上面的完整代码：/ y+ w  S# e4 F1 y! E2 c* B  F
<?php2 ]$ m$ e! r$ M( ^, p
$server = "localhost"; //your server) v  y2 G% k. R
$db_user = "root"; //your mysql database username" R8 a& W5 a) p- l
$db_pass = "password"; //your mysql database password if any
$database = "users"; //the db name8 t: y3 R7 @. U) A2 B6 O
$timeoutseconds = 300;//timeoutseconds limit( h; s3 |* j4 F! e7 s2 t
//get the current time9 F- s3 g0 F6 V2 h" H4 q- c
$timestamp = time();& }3 P1 r& G! d
//calculate the lowest timestamp allowed
$timeout = $timestamp-$timeoutseconds;
?>连接mysql
mysql_connect('localhost', 'username', 'password');也允许使用变量形式。
mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接4 p- z  M8 n; w  [" [0 V
mysql_connect($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。
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");9 J( V* J) F+ K( m3 L
如果用户用错误信息的话，这样处理。
if(!($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。. j# Y; P8 r: t$ e
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。/ n  {7 m5 \; }6 x2 z
if(!($delete)) {
print "Useronline Delete Failed > ";& D0 |. {1 o% O  d4 q7 L" h( v% e
}下面我们解决数据库中不同IP的问题3 \* e5 l7 g% H! T8 m
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用) r7 |3 c/ F- t" w$ v
mysql_num_rows(query);来统计用户，代码如下。% u6 Y$ {, \, O. [' G5 r' I
$user = mysql_num_rows($result);最后关闭数据库。9 z5 a1 g2 t1 F, O1 V" b
mysql_close();显示在线的人数。
if($user == 1) {
print("1 user online\n");
} else {
print("$user users online\n");0 q; f) f2 h+ a
}最终把上面代码写成一个PHP文件如下。
<?php
//Put your basic server info here. p8 I) O- N' `6 s, T7 Q2 Q4 Q
$server = "localhost"; //normally localhost; n/ \, g& g/ |/ C4 v2 `, B
$db_user = "root"; //your MySQL database username
$db_pass = "password"; //your MySQL database password2 {1 i7 I& j; ~7 @& M: n9 T
$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/ G# {  f7 _4 P, C8 }
// $timeoutseconds seconds)8 T- A( n+ r, J
//this is where PHP gets the time% t0 u7 D; e: Y6 x6 M. Z7 H
$timestamp = time();
//counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed
$timeout = $timestamp-$timeoutseconds;/ @, q* {% `. E7 B$ c/ k0 M
//connect to database
mysql_connect($server, $db_user);
//add the timestamp from the user to the online list
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");% `- k# ^  R7 }. G
if(!($insert)) {
print "Useronline Insert Failed > ";
}
//delete the peoples which haven't been online/active in the last $timeoutseconds seconds.$ }* N" l2 _" T* s' L8 o' B
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");
if(!($delete)) {2 {  X; G6 ?+ {! A$ U
print "Useronline Delete Failed > ";4 l- G& ^7 C" p: N
}
//select the amount of people online, all uniques, which are online on THIS page6 V3 n  f! A' n: F5 C+ l# b
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");8 y) v/ |/ W6 g" g. b, Y6 F7 T
if(!($result)) {8 P& }) Q4 L1 k* Y# Z) Q3 W
print "Useronline Select Error > ";
}
//Count the number of rows = the number of people online6 k4 L3 U5 M+ w& e- T+ {/ K2 E1 }0 b
$user = mysql_num_rows($result);
//spit out the results& e+ ~6 b8 l/ y) b( P
mysql_close();
if($user == 1) {1 P$ ^$ w1 H. h
print("1 user online\n");
} else {
print("$user users online\n");
}
?>

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。+ R' w6 o, Q* ]0 K- h
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。6 {% a$ n( \. q/ O$ M: y
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。* ]* E/ ^# |, e+ _5 c! p) \
当然啦，这两款主机也是相当不错的。& v; J' t% |" ]# t6 p) p, [3 K
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/ ! Q* z5 t) N' I* m' I% z
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# S, H* F6 u; Z
自己加QQ去问吧。

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