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！9 m) o8 x: d' ~6 G6 f
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。7 [: o8 I( e/ z  y$ F6 q
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 (1 H) j$ I3 h) [
timestamp int(15) DEFAULT '0' NOT NULL,; U4 |+ f. O7 r5 w+ ^
ip varchar(40) NOT NULL,
file varchar(100) NOT NULL," \( M8 M4 T& p3 F3 _+ X
PRIMARY KEY (timestamp),4 ^* k/ d$ h2 u. i
KEY ip (ip),! `; f, O- W" `$ r  p0 ?
KEY file (file), v2 \7 _9 c- e/ u+ q  t6 ]
);下面我们是PHP脚本，首先我定义MYSQL的信息。
$server = "localhost"; //你的服务器
$db_user = "root"; //你的mysql的用户名$ I" }! `5 Y- @$ x
$db_pass = "password"; //你的mysql的密码0 j8 P1 a& G' \: {7 W
$database = "users"; //表的名字设置统计的时间(多少秒内在线人数)
$timeoutseconds = 300;取当前时间。5 z, L3 k) k# \! b
$timestamp = time();上面的完整代码：8 ?, h6 n( r% n3 C
<?php
$server = "localhost"; //your server6 b5 d' `! c6 t  g1 T/ A
$db_user = "root"; //your mysql database username
$db_pass = "password"; //your mysql database password if any
$database = "users"; //the db name, ?+ f6 d  z5 ^& h& M
$timeoutseconds = 300;//timeoutseconds limit, k) D6 F& ]2 d$ c( G7 \
//get the current time4 r  C5 i) x, f; C3 x/ Z- W
$timestamp = time();3 j, k- U( O' ?' a: ?
//calculate the lowest timestamp allowed* h$ u; W$ S, I+ S  {8 k" o* r0 Q
$timeout = $timestamp-$timeoutseconds;
?>连接mysql, |. j: {% J) r
mysql_connect('localhost', 'username', 'password');也允许使用变量形式。6 P+ G/ K- m! x8 [& h( z; D( x
mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接
mysql_connect($server, $db_user);查询数据库的代码：9 {% p- ]! @' M
mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。1 H- x0 ~9 x- u+ S: I$ k& P4 L
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
如果用户用错误信息的话，这样处理。8 z. |8 p3 L* L/ v# u. Q% Q3 R% ]$ h
if(!($insert)) {
print "Useronline Insert Failed > ";
}然后实现当超过设置的时间就删除该用户记录。
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。
if(!($delete)) {$ Y6 W- v8 M( w  n% G
print "Useronline Delete Failed > ";2 o1 F" _+ O0 C2 g+ W
}下面我们解决数据库中不同IP的问题( w9 j* E$ x3 R$ f
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用
mysql_num_rows(query);来统计用户，代码如下。
$user = mysql_num_rows($result);最后关闭数据库。- |7 \) R2 {4 w$ u# \4 y7 H& o
mysql_close();显示在线的人数。, }7 `1 A+ B, D
if($user == 1) {( I% S5 A2 c" w; h; @% Q* L' p& x+ n
print("1 user online\n");
} else {
print("$user users online\n");" `4 y6 F3 e2 V3 S" |1 y
}最终把上面代码写成一个PHP文件如下。
<?php
//Put your basic server info here
$server = "localhost"; //normally localhost
$db_user = "root"; //your MySQL database username
$db_pass = "password"; //your MySQL database password
$database = "users";& s$ i9 }0 O9 ~0 w9 G
$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 last1 o5 U& v4 d' W; e0 d
// $timeoutseconds seconds)
//this is where PHP gets the time4 `' q1 h- M; M5 r4 ~4 F: y
$timestamp = time();
//counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed; u9 v4 Z. Q: s% x' _8 [
$timeout = $timestamp-$timeoutseconds;4 `' i7 q) L3 V4 M  t! n- V8 K
//connect to database5 R$ g; J! z5 ?# F& L% H4 u
mysql_connect($server, $db_user);' ~: u8 a2 o, _. P0 ?, ]
//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)) {2 e- v4 `% `( v4 L" k7 Q/ J6 _
print "Useronline Insert Failed > ";
}6 W3 I1 }8 l. N3 M
//delete the peoples which haven't been online/active in the last $timeoutseconds seconds.: a7 t  ~( R) o6 v1 I9 @
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");# E, U6 |$ e% H# S$ }% |9 Q
if(!($delete)) {( r8 F8 o% \% y
print "Useronline Delete Failed > ";
}2 R& {! _7 r0 V& j8 v* m0 T+ V, ~  C( m
//select the amount of people online, all uniques, which are online on THIS page$ X, p% p1 n* x# o8 q7 M( S& ?
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");; z' ]0 g. \& }8 C
if(!($result)) {
print "Useronline Select Error > ";) _* Y6 c  H5 m) w
}
//Count the number of rows = the number of people online
$user = mysql_num_rows($result);4 T! J  ~" w4 s0 q2 t
//spit out the results3 `& c2 V9 P. r
mysql_close();
if($user == 1) {
print("1 user online\n");
} else {! ]( M7 j1 o& p1 N8 y# b8 {
print("$user users online\n");- I8 ?7 K+ E9 T3 d8 m8 d
}3 U  x) ^1 K( w9 |0 y! ]6 E
?>

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。
当然啦，这两款主机也是相当不错的。6 r7 i( ?0 _5 |8 x/ L
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. ^* S4 h1 u+ H- V, G
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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