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。4 ]: {  W6 `3 G, i0 o
首先我创建MYSQL数据库表。
CREATE TABLE tablename (1 u$ ?% ]' o; I3 ]1 y# }! j
field type(max_length) DEFAULT 'default_value' (NOT) NULL7 r$ l3 Z8 B$ ?: N! y
}可以使用的SQL语句。) Y+ P  P' l3 X* m. N
CREATE TABLE useronline (
timestamp int(15) DEFAULT '0' NOT NULL,
ip varchar(40) NOT NULL,: R1 I* A: o  d+ P  c9 E
file varchar(100) NOT NULL,
PRIMARY KEY (timestamp),2 W4 j9 z$ ~; F5 V" T
KEY ip (ip),
KEY file (file)
);下面我们是PHP脚本，首先我定义MYSQL的信息。% N, o5 H. F2 r- _# \6 W% H0 I  K
$server = "localhost"; //你的服务器
$db_user = "root"; //你的mysql的用户名
$db_pass = "password"; //你的mysql的密码; A; [* E! L! ^0 Y5 G, `" @8 @
$database = "users"; //表的名字设置统计的时间(多少秒内在线人数): h# M0 _5 [5 C, E9 y1 g
$timeoutseconds = 300;取当前时间。7 E& e0 c! l( z# O
$timestamp = time();上面的完整代码：9 j3 ~4 N9 N+ ^# H  z/ z8 i6 g
<?php" ]* m0 W/ O: C' x
$server = "localhost"; //your server; N+ s9 v4 b# u9 [7 I
$db_user = "root"; //your mysql database username& V7 R$ B* [8 k1 s
$db_pass = "password"; //your mysql database password if any6 ~* F  W+ w. T# o+ S+ T
$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mysql9 ?; F9 l5 @3 C6 m" v) R
mysql_connect('localhost', 'username', 'password');也允许使用变量形式。" i/ B) w, b$ A: k+ n; N
mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接* S3 s* H' Y# s9 o% y& f
mysql_connect($server, $db_user);查询数据库的代码：- P8 H5 E) T2 F6 i
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']."','".$_SERVER['PHP_SELF']."')");
如果用户用错误信息的话，这样处理。
if(!($insert)) {
print "Useronline Insert Failed > ";. O# ?: B2 V, |2 ~
}然后实现当超过设置的时间就删除该用户记录。# K: h- U( K* I8 ?1 _. q0 S' d
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。8 b- G& R" C& @
if(!($delete)) {
print "Useronline Delete Failed > ";
}下面我们解决数据库中不同IP的问题+ H. M4 K& e: H5 h$ V
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用/ l9 C) T  {; w/ i6 r
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。
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。4 b& J$ m0 V1 ~) B0 X5 J
<?php3 R% g! z( A" M7 C) T
//Put your basic server info here0 A. S( y3 f' N$ k, {5 i. C
$server = "localhost"; //normally localhost
$db_user = "root"; //your MySQL database username
$db_pass = "password"; //your MySQL database password1 {3 N- }  s0 F1 v) u. }1 m2 g  i6 Q" ^
$database = "users";
$timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably are1 C. n7 b8 t) N, O2 Y% J
// offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last+ j# H. [  m: u7 j3 n. k3 Z
// $timeoutseconds seconds)
//this is where PHP gets the time
$timestamp = time();6 c0 ]4 f2 D4 Y  Z, W
//counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed
$timeout = $timestamp-$timeoutseconds;& ~* |% @2 j# N$ g+ l( |
//connect to database
mysql_connect($server, $db_user);1 T  v" h& Z* V3 c, N4 f" t: X
//add the timestamp from the user to the online list
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
if(!($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<$timeout");; b) P3 P* R/ q6 ?1 o- @
if(!($delete)) {
print "Useronline Delete Failed > ";
}0 |( W9 W. ^& d8 \0 w
//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='".$_SERVER['PHP_SELF']."' ");4 i" V5 W* R  r, v  F' y( g# p
if(!($result)) {
print "Useronline Select Error > ";
}
//Count the number of rows = the number of people online- u) ^* m1 b0 v1 \) E7 Z
$user = mysql_num_rows($result);9 Y) @8 A& Z- `& y" B4 i
//spit out the results
mysql_close();/ |1 ?% k& `5 ~- L! l
if($user == 1) {( Y* n/ z4 d5 x/ \1 R
print("1 user online\n");
} else {
print("$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。6 d& R  i, d0 E0 x! t1 ?
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。
当然啦，这两款主机也是相当不错的。& a/ T3 j( r( ]2 S
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1 W' u( o" n* y/ ~) X. {
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  P9 i/ J# o) x) H4 J
提供一下这个公司的联系方式：请见：http://www.now.cn/vhost/ . I# y; Y5 x) r/ W# y8 y- d' e
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  l, W. Z9 d5 @" q
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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