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。5 f+ L0 }& o; N. D2 J4 A! B
首先我创建MYSQL数据库表。8 J9 b" e4 E- l9 l5 i: ]& {
CREATE TABLE tablename (
field type(max_length) DEFAULT 'default_value' (NOT) NULL" z% X& v1 ]; i) W0 V" k
}可以使用的SQL语句。! S8 Z: ?% s4 h0 m0 i+ ^+ d1 [: w
CREATE TABLE useronline (4 ~  F9 c: i2 u8 T( ^, G
timestamp int(15) DEFAULT '0' NOT NULL,
ip varchar(40) NOT NULL,
file varchar(100) NOT NULL,7 k9 H% K3 L. k, l+ ^( h
PRIMARY KEY (timestamp),
KEY ip (ip),
KEY file (file)8 B8 r- d2 G; K3 j
);下面我们是PHP脚本，首先我定义MYSQL的信息。+ C" s  Q6 j4 v- |2 j- Z. W6 Y1 V
$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
$database = "users"; //表的名字设置统计的时间(多少秒内在线人数); `7 [# h& N3 O' u6 j3 M
$timeoutseconds = 300;取当前时间。
$timestamp = time();上面的完整代码：; ^8 e+ z; \/ s7 A4 a4 h" Z
<?php; M( i5 T3 \6 r5 u* K
$server = "localhost"; //your server
$db_user = "root"; //your mysql database username
$db_pass = "password"; //your mysql database password if any
$database = "users"; //the db name9 k7 t2 M3 N/ Z! b5 P
$timeoutseconds = 300;//timeoutseconds limit
//get the current time
$timestamp = time();; A7 H. u. }+ E& O9 [
//calculate the lowest timestamp allowed+ l# Z3 D* a* ~! C6 q
$timeout = $timestamp-$timeoutseconds;
?>连接mysql; e$ o& s0 B6 Z" F7 R
mysql_connect('localhost', 'username', 'password');也允许使用变量形式。! l' D  k9 ~* H  E. u* n+ t* p6 f
mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接6 z# j! x# G$ V% _
mysql_connect($server, $db_user);查询数据库的代码：) i1 n, X) L6 R0 D2 Q2 Z
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 VALUES1 b8 W5 K( h+ I2 _+ u8 [
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
如果用户用错误信息的话，这样处理。7 s+ B+ T! z% z- Y; N  \) ]% W
if(!($insert)) {
print "Useronline Insert Failed > ";: b$ p; j: y3 s
}然后实现当超过设置的时间就删除该用户记录。5 g5 V! A% {/ S# F, k% v; G" X0 G
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。, O, r3 f: o! ]( `7 }
if(!($delete)) {! T1 `; D5 b5 H/ k" m2 H* n* K) d
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7 u7 p, Q& {# v9 v5 [1 y6 H
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。7 e& q1 L! f9 ]0 D1 y7 l
if($user == 1) {1 q& m- d2 K1 N! G0 Y2 j
print("1 user online\n");- d% x" g( y# [: e; g/ |
} else {
print("$user users online\n");
}最终把上面代码写成一个PHP文件如下。
<?php5 O; C6 Q$ q9 H. a) P- y
//Put your basic server info here* }5 K# `: L& d& j
$server = "localhost"; //normally localhost8 b! m+ b8 Q: t
$db_user = "root"; //your MySQL database username
$db_pass = "password"; //your MySQL database password
$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
// $timeoutseconds seconds)
//this is where PHP gets the time
$timestamp = time();% d4 g9 b8 z' R$ B0 n3 f  [  ~
//counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed
$timeout = $timestamp-$timeoutseconds;7 o# y8 M9 |5 U
//connect to database! \% s& L! j% C1 A
mysql_connect($server, $db_user);6 ~$ N/ f# P; F
//add the timestamp from the user to the online list, P6 I  r! ?' l+ X; B* `
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
if(!($insert)) {
print "Useronline Insert Failed > ";
}# m8 h; @: P. A) k8 n/ i* Y  L$ k9 R
//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)) {$ W  C5 P1 V8 x
print "Useronline Delete Failed > ";5 p, B7 r" m6 {/ g7 C- _& [9 d
}$ N  _9 H( z, `1 M  ]8 V
//select the amount of people online, all uniques, which are online on THIS page; m& P1 K# P8 F6 t
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");! |4 ]) ?0 Z$ D7 n1 @
if(!($result)) {
print "Useronline Select Error > ";
}
//Count the number of rows = the number of people online6 R4 @8 q  i; `: }2 _
$user = mysql_num_rows($result);
//spit out the results
mysql_close();
if($user == 1) {
print("1 user online\n");: l/ B  a- d2 K2 c$ F3 i
} else {
print("$user users online\n");2 ~: ?" k. v2 T
}( `  B3 x+ z% h7 i8 N$ N
?>! e) F) v0 q9 a5 N5 D

7 i7 X3 X' S( a- E7 X, p
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。5 s7 h2 Y' @! E8 u, ]+ ?5 ]! o
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。
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( g4 z; q( J2 ]# O u
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; N# E1 n5 k# I. C, C- L
提供一下这个公司的联系方式：请见：http://www.now.cn/vhost/ ( }' ?9 t3 D( s4 X$ z: Z6 \( 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" V6 j7 q5 T% I2 U3 j# s' g" j
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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