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。
首先我创建MYSQL数据库表。; E5 M- |" V% B7 N" ^
CREATE TABLE tablename (
field type(max_length) DEFAULT 'default_value' (NOT) NULL
}可以使用的SQL语句。( i" A) B; n6 z- s1 m
CREATE TABLE useronline (
timestamp int(15) DEFAULT '0' NOT NULL,9 E$ U. ?6 A6 L+ t8 C
ip varchar(40) NOT NULL,
file varchar(100) NOT NULL,
PRIMARY KEY (timestamp),1 R5 s$ c9 b: P3 h% L
KEY ip (ip),0 m8 w$ {- @, C' K! Q0 y- L3 X. u
KEY file (file)! W9 k2 X3 `/ Q, [
);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5 V/ t9 e2 j5 ~) I4 Y9 f/ w
$db_pass = "password"; //你的mysql的密码0 l9 c: G, v" ^% h* `
$database = "users"; //表的名字设置统计的时间(多少秒内在线人数)6 R1 O3 c9 c: ^) E9 ?: o
$timeoutseconds = 300;取当前时间。
$timestamp = time();上面的完整代码：. D# n! f3 w* O
<?php  D6 v5 R3 ^: |0 q6 V
$server = "localhost"; //your server
$db_user = "root"; //your mysql database username2 g) \) _  l& J% h3 j/ u
$db_pass = "password"; //your mysql database password if any2 l- e) M( t- I1 I
$database = "users"; //the db name
$timeoutseconds = 300;//timeoutseconds limit2 ~, e0 _8 u' V0 C. H
//get the current time
$timestamp = time();
//calculate the lowest timestamp allowed) C: Z9 E) P+ Y9 S( A
$timeout = $timestamp-$timeoutseconds;
?>连接mysql( L( a$ b$ e6 n
mysql_connect('localhost', 'username', 'password');也允许使用变量形式。. c, }+ C/ `, t9 t# ^' D9 e, O$ L
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。; E% `5 v+ Z9 e% u
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES5 w6 @  ~1 o+ H
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
如果用户用错误信息的话，这样处理。, V% ^# }! U: G6 h
if(!($insert)) {5 P+ i; x' Q5 x9 {3 c2 ]# [  N& i3 W
print "Useronline Insert Failed > ";! A# A+ |7 ]2 }
}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 > ";3 {! ~8 B+ t$ n5 }9 k: O5 f* u# g4 z
}下面我们解决数据库中不同IP的问题$ q; z( K* D: H' c
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用* M2 M$ A" X. m3 w3 l) F) ]
mysql_num_rows(query);来统计用户，代码如下。0 Z0 ]; n5 Z1 e) g& |
$user = mysql_num_rows($result);最后关闭数据库。5 p! L: \7 R4 t) m5 |# F
mysql_close();显示在线的人数。, r" n! t' D4 |& k
if($user == 1) {
print("1 user online\n");! h; Z) \; r" G+ H2 ^, r- W3 D
} else {# Y8 x  f/ i( v3 n8 g: j
print("$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 here2 f+ A0 s* N% B0 N  A
$server = "localhost"; //normally localhost' e+ S" a& A! y# c% a- F/ S
$db_user = "root"; //your MySQL database username9 r& u* W6 G) U- O: j  j- d& g
$db_pass = "password"; //your MySQL database password
$database = "users";! h: H- C( J7 @9 P) z. j9 ]
$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();
//counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed6 k7 k7 I8 n8 ^8 z7 F
$timeout = $timestamp-$timeoutseconds;' A/ S; ~* D- t0 T) C
//connect to database  n% I- i, w/ _9 Y: Y0 \
mysql_connect($server, $db_user);  X' z. g; U+ c
//add the timestamp from the user to the online list) |* \, S2 e8 m) f8 A
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES, l! P; j( M' H, ~" r# K: E1 q
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");$ L) |: v5 y3 h& g$ R( M5 C
if(!($insert)) {% V$ B/ K2 v& D; r4 a. b3 l# L) W
print "Useronline Insert Failed > ";- v8 W5 r7 p- `  W9 [; v. s! g7 q& h: k
}
//delete the peoples which haven't been online/active in the last $timeoutseconds seconds.% Y% N8 L' c, `6 c' G
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");" n9 ?+ l1 r' A4 W
if(!($delete)) {
print "Useronline Delete Failed > ";
}8 Q6 C8 M" n0 j4 ~4 `
//select the amount of people online, all uniques, which are online on THIS page% w3 o8 q& p  C7 Q9 ^8 d- t
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");
if(!($result)) {9 Q* T* a- n4 `9 M7 F% E4 o0 m+ ^
print "Useronline Select Error > ";$ s; ?% U: ~8 b
}
//Count the number of rows = the number of people online
$user = mysql_num_rows($result);
//spit out the results
mysql_close();
if($user == 1) {
print("1 user online\n");' N$ G' P0 Y( Y, o1 l
} else {
print("$user users online\n");
}; ^3 M% B# m( @$ j, D5 u7 T
?>0 q( `( O( l( f+ w

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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。
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。. S0 u% E. s1 ^4 f1 K1 U
当然啦，这两款主机也是相当不错的。( Y- W- q- l. Z3 t4 {$ ]7 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
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/ 9 y; {9 D" p+ {' R, ?, \
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=551 f+ V, z9 ?: y- F+ h6 M. K x+ p
自己加QQ去问吧。

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