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。+ W# ]/ z( D, B. T1 j
首先我创建MYSQL数据库表。
CREATE TABLE tablename (
field type(max_length) DEFAULT 'default_value' (NOT) NULL+ j7 k- h, M! R0 R5 }! {' @
}可以使用的SQL语句。$ E+ c: z* C+ }/ g
CREATE TABLE useronline (& G5 h, z, z( y) i! r- u9 k
timestamp int(15) DEFAULT '0' NOT NULL,
ip varchar(40) NOT NULL,. e* ~3 u$ `% g! u) H. t( Z" i; \
file varchar(100) NOT NULL,
PRIMARY KEY (timestamp),1 b6 s' O9 @  Z! }8 B1 G8 Z( i
KEY ip (ip),6 {, v( S! E2 q- V$ U& ]
KEY file (file)
);下面我们是PHP脚本，首先我定义MYSQL的信息。, J: {+ {: M  Z+ |7 c
$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)( w* r/ Z/ P( _1 l
$timeoutseconds = 300;取当前时间。1 L- D! p) G4 x9 y* m
$timestamp = time();上面的完整代码：
<?php
$server = "localhost"; //your server1 {0 W7 S0 l: B( e9 E" H
$db_user = "root"; //your mysql database username0 Q* g7 x) x* L+ v/ v' u; L, r
$db_pass = "password"; //your mysql database password if any. [6 j/ k2 K0 Y. W/ L. V' M
$database = "users"; //the db name
$timeoutseconds = 300;//timeoutseconds limit1 E- F# Y3 c, W, Q/ x& G
//get the current time
$timestamp = time();
//calculate the lowest timestamp allowed
$timeout = $timestamp-$timeoutseconds;8 `( U$ B6 Y# J2 I6 a9 X. B: ~
?>连接mysql
mysql_connect('localhost', 'username', 'password');也允许使用变量形式。* R& S: F$ N1 e9 Q4 v$ p
mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接/ e: @" b! b6 L7 j/ f( a7 R
mysql_connect($server, $db_user);查询数据库的代码：! ?& l/ t7 }/ g5 A) C3 A3 _
mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。# I  z6 f, l/ V' f- m4 y
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES* A* v8 f! H8 G- R. M% K; Q' u) ?
('$timestamp','".$_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 > ";
}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)) {
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( c( j+ v" E1 z. X
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。* X$ B* }: p1 m2 \* M8 s! y
mysql_close();显示在线的人数。' x; i& [2 h  z/ v3 w( B
if($user == 1) {
print("1 user online\n");  R2 `. H7 r8 `) R: f8 O  j
} else {7 h! S4 ~$ m  n5 v% F; w
print("$user users online\n");
}最终把上面代码写成一个PHP文件如下。7 i6 u* V: S5 c) |
<?php
//Put your basic server info here. @( A# |8 ~- |7 @
$server = "localhost"; //normally localhost6 [! J/ z9 e8 @8 L" y
$db_user = "root"; //your MySQL database username1 Y; \! C8 z* e4 ^1 |
$db_pass = "password"; //your MySQL database password' K" A- s2 O+ D6 t
$database = "users";) @' W9 N. @% w' t
$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  o9 J' l( L# O
$timestamp = time();- F/ U  Y5 H' i4 A, h
//counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed
$timeout = $timestamp-$timeoutseconds;
//connect to database, L, I3 Q8 Y. k4 {5 H6 ^7 ?
mysql_connect($server, $db_user);
//add the timestamp from the user to the online list) c9 v# }7 |) \. u3 i& Y
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
if(!($insert)) {4 k+ w4 Z6 q7 I* W
print "Useronline Insert Failed > ";. t3 l+ V2 R' W, @/ f
}
//delete the peoples which haven't been online/active in the last $timeoutseconds seconds." A3 g1 [* A( u
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");
if(!($delete)) {
print "Useronline Delete Failed > ";2 w( m- X4 B" z/ g! y# n% E
}3 u" Z4 R6 L( ~4 ?4 p( i
//select the amount of people online, all uniques, which are online on THIS page  i, a, O  z* M0 A  B
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");
if(!($result)) {7 R" t2 ~/ A$ |. Q3 x. x$ @' V
print "Useronline Select Error > ";
}7 V. E" C% Q+ z  o( Q5 P9 y
//Count the number of rows = the number of people online
$user = mysql_num_rows($result);) I* P3 h+ n! e3 i& z5 I
//spit out the results
mysql_close();9 _( j6 c; K2 a/ r, ^
if($user == 1) {
print("1 user online\n");
} else {) {; T/ ]+ H# t' _: Z
print("$user users online\n");
}
?>

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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。0 y3 F. B0 V$ M; x4 l% b; y. G
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7 j/ W# F! b- f* |7 d: h/ h b
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/ & J9 y1 o2 U. v5 p
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 f/ R4 o5 W# U! R1 a5 N
自己加QQ去问吧。

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