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。4 P- z0 a! y1 M+ i: }
首先我创建MYSQL数据库表。
CREATE TABLE tablename (- p. Q% R; {5 n6 g3 N
field type(max_length) DEFAULT 'default_value' (NOT) NULL" M4 M& y" V+ i% n
}可以使用的SQL语句。+ `2 U+ H( U) u4 c2 |
CREATE TABLE useronline () {! a" `" C7 B+ g
timestamp int(15) DEFAULT '0' NOT NULL,
ip varchar(40) NOT NULL,
file varchar(100) NOT NULL,
PRIMARY KEY (timestamp),7 I3 M( m: P, T9 H! k  I
KEY ip (ip),  u; K8 ?+ C; T) ?
KEY file (file)" o# m3 y' I3 {
);下面我们是PHP脚本，首先我定义MYSQL的信息。/ T6 @4 e' J  q9 L
$server = "localhost"; //你的服务器$ r6 p+ c+ y0 \
$db_user = "root"; //你的mysql的用户名
$db_pass = "password"; //你的mysql的密码$ `0 y; a( U1 N$ j
$database = "users"; //表的名字设置统计的时间(多少秒内在线人数)% W! K* m; k1 `& `
$timeoutseconds = 300;取当前时间。
$timestamp = time();上面的完整代码：
<?php  _7 r3 i1 D/ z2 m9 g2 H4 S
$server = "localhost"; //your server6 m  U& x- E# r. W
$db_user = "root"; //your mysql database username
$db_pass = "password"; //your mysql database password if any
$database = "users"; //the db name
$timeoutseconds = 300;//timeoutseconds limit
//get the current time/ b) F) Q/ B/ Q6 G/ w: j1 g
$timestamp = time();3 w! ^6 w( u$ g0 e' h
//calculate the lowest timestamp allowed7 [7 h; M  H5 p) i5 Z
$timeout = $timestamp-$timeoutseconds;
?>连接mysql
mysql_connect('localhost', 'username', 'password');也允许使用变量形式。% W- p4 K* {: e- M; r2 t- G
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。2 X8 ?3 j# h* s. t0 P/ z
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES+ O0 _' j# N& S" m4 K" S1 u3 v
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");. a6 f. }# J6 P0 N  M
如果用户用错误信息的话，这样处理。
if(!($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<$timeout");同样给出删除记录出错的处理。5 {: {. i% r& T' \
if(!($delete)) {
print "Useronline Delete Failed > ";
}下面我们解决数据库中不同IP的问题* s5 {* n- z$ K
$result = mysql_db_query($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。8 J. p5 b: j2 @! Y7 j, V
$user = mysql_num_rows($result);最后关闭数据库。3 }5 @9 R) o" q6 U4 G& g+ p
mysql_close();显示在线的人数。! P: |+ s+ X% ?4 U: H$ d
if($user == 1) {, i9 s' q% x* ?/ D" E$ ~
print("1 user online\n");, ~2 \1 q0 k. Q9 s
} else {
print("$user users online\n");# X; O; Z  [: M2 v
}最终把上面代码写成一个PHP文件如下。; O) V1 J7 ?$ p  M) N
<?php5 ^3 U- _0 A* G" F& r) Y
//Put your basic server info here/ |1 B8 |1 r4 L& \$ k
$server = "localhost"; //normally localhost
$db_user = "root"; //your MySQL database username
$db_pass = "password"; //your MySQL database password
$database = "users";3 G" e& q9 p! \* ]  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 last
// $timeoutseconds seconds)
//this is where PHP gets the time
$timestamp = time();. o4 f5 S9 ]" A# u
//counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed. u( v. y$ q0 z: E7 E7 `
$timeout = $timestamp-$timeoutseconds;. o; f; P4 @- Y% S3 @: G7 a) b1 q
//connect to database. G; O. U9 x* P' p; j
mysql_connect($server, $db_user);
//add the timestamp from the user to the online list
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES. S; f# Y: h1 @
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
if(!($insert)) {
print "Useronline Insert Failed > ";
}: R1 S( h' F; Z' D% @3 J
//delete the peoples which haven't been online/active in the last $timeoutseconds seconds.' f2 Y- I& }& Q. p7 O: i
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");$ Z% h$ U3 M  ]& B+ j4 _/ ]0 y% t
if(!($delete)) {4 ?5 t- }* }0 ^0 {, s
print "Useronline Delete Failed > ";$ T# T: H' T3 H+ o# s
}, M8 o' ~/ D, m3 l- r4 N: Q
//select the amount of people online, all uniques, which are online on THIS page
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");
if(!($result)) {& f- x! U) T1 O, K9 _$ G
print "Useronline Select Error > ";
}
//Count the number of rows = the number of people online
$user = mysql_num_rows($result);5 i) h& Z; \7 B1 M+ O
//spit out the results
mysql_close();
if($user == 1) {
print("1 user online\n");
} else {
print("$user users online\n");
}
?>

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。/ G- N( @! z/ L: x% ^: ~+ e& b4 F' K6 F
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。" } y& K( S* r" E) E
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。: `6 T, S' [5 a! E
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4 E7 J0 ?* I6 U4 n" p
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' z+ m' O3 W2 S) N1 N
提供一下这个公司的联系方式：请见：http://www.now.cn/vhost/ : E: d! O! p5 y6 p8 \% t
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 Z( l2 }6 k- U" z# U1 V7 i3 N/ Z
自己加QQ去问吧。

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