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！  d- U: a) o  C% ^9 V" q! Y
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。
CREATE TABLE tablename (/ J4 z: T2 D1 y9 Q8 g# H
field type(max_length) DEFAULT 'default_value' (NOT) NULL) M& A' N) A5 M5 g" N+ C+ p
}可以使用的SQL语句。7 A! o" G0 S' ?3 T- ?
CREATE TABLE useronline (
timestamp int(15) DEFAULT '0' NOT NULL,
ip varchar(40) NOT NULL,
file varchar(100) NOT NULL,, t& f, g3 x' c) H1 g0 z* U
PRIMARY KEY (timestamp),
KEY ip (ip),
KEY file (file)7 w. |4 z8 m- I
);下面我们是PHP脚本，首先我定义MYSQL的信息。
$server = "localhost"; //你的服务器7 r" i5 R# `* X( Q6 [0 H
$db_user = "root"; //你的mysql的用户名
$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)" ]2 S* p% j9 ^' S/ Q1 Z
$timeoutseconds = 300;取当前时间。( U5 l( V) ^" `6 u$ X
$timestamp = time();上面的完整代码：% }6 b; p; O7 Q$ m7 I9 G3 l
<?php' p3 G+ y- _1 @$ c
$server = "localhost"; //your server7 U5 n+ c! L0 @* x4 G$ ?
$db_user = "root"; //your mysql database username4 s0 A7 }( K( W( B; O
$db_pass = "password"; //your mysql database password if any* ?5 w1 D" G8 s4 @
$database = "users"; //the db name  a3 W3 N( z/ H, t3 p% `2 {7 t. U
$timeoutseconds = 300;//timeoutseconds limit$ w0 L) A5 ~" w- @, y% T0 u
//get the current time; }! r. S+ b+ D
$timestamp = time();: I3 O+ w' [0 i$ I9 _3 G
//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。7 u6 @/ j' B+ |/ b7 }9 w
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：
mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。( ~, L, r9 ?; Z/ G
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
如果用户用错误信息的话，这样处理。$ A5 r$ m5 m, w8 O7 H2 I
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<$timeout");同样给出删除记录出错的处理。/ {/ N/ a4 F0 I4 e0 ]2 s* Q- c5 T" G
if(!($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# N' }+ M  w  e+ R& w
mysql_num_rows(query);来统计用户，代码如下。# K% k2 j- `) n% p& w# F) H+ V
$user = mysql_num_rows($result);最后关闭数据库。& {& F# o% [, u6 ?/ h; v3 C2 x
mysql_close();显示在线的人数。
if($user == 1) {" Y/ {" j; S; m7 U+ m$ c+ ]
print("1 user online\n");
} else {4 g+ }: h* d- T1 P9 p2 a$ n
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 here
$server = "localhost"; //normally localhost; y! f1 ]9 `3 |7 b" f* r
$db_user = "root"; //your MySQL database username
$db_pass = "password"; //your MySQL database password6 t2 `! |0 v+ Y+ I4 Y$ A/ W! i/ i
$database = "users";; U, O! H3 b# e) G/ J
$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
// $timeoutseconds seconds)- J$ L+ _% \- x$ `+ X# w* q% }
//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  \3 s8 r2 n  {0 }  ^  v: m
$timeout = $timestamp-$timeoutseconds;
//connect to database
mysql_connect($server, $db_user);' O% O' _5 I7 {' C4 ^
//add the timestamp from the user to the online list
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");  @8 P7 o4 J* I
if(!($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<$timeout");
if(!($delete)) {
print "Useronline Delete Failed > ";
}
//select the amount of people online, all uniques, which are online on THIS page" C7 u0 z, |5 K  `
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");7 x3 v+ r1 E% [* G! X
if(!($result)) {! s+ n1 @0 |' G
print "Useronline Select Error > ";" J& U+ V) c8 Q& l  w0 s
}; I( E3 s9 C  l& p
//Count the number of rows = the number of people online* \( n% H8 V; y4 d4 V6 m, R* H) N
$user = mysql_num_rows($result);7 L# c" z( P0 k: S2 \( ]
//spit out the results" e. G  M: O: c, H0 D  \
mysql_close();+ {0 A! u2 P. Z$ h
if($user == 1) {
print("1 user online\n");, z7 B8 q( j+ h. I
} else {, [8 J6 j6 {# F. ?8 @1 K# E8 W
print("$user users online\n");" P- x& v# c4 N9 D2 z
}
?>6 P  g' N" F: a# X  M4 w# {

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 V# }) t! t5 R6 G! L) ]
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。) Q. t" t# l- T" T( W2 \
当然啦，这两款主机也是相当不错的。5 J) _+ ?8 L6 U% ?9 H
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/ + ]/ f% w8 E$ y" 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$ U" O+ G1 {6 B A
自己加QQ去问吧。

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