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; J  Z( z1 O( {
首先我创建MYSQL数据库表。: t, p8 D) t. w: B7 Q; B! r
CREATE TABLE tablename (
field type(max_length) DEFAULT 'default_value' (NOT) NULL/ B: c6 D4 s6 f8 Y0 _1 H' g- |
}可以使用的SQL语句。
CREATE TABLE useronline (% o( N8 Z, Z2 i( _" X2 A; k
timestamp int(15) DEFAULT '0' NOT NULL,
ip varchar(40) NOT NULL,# `% j+ N; h* c6 `4 t$ m! t
file varchar(100) NOT NULL,
PRIMARY KEY (timestamp),
KEY ip (ip),/ x0 t& h9 E6 a5 G1 p. {7 j
KEY file (file)% P5 H. E5 |1 Z  ^* v1 `8 t2 H
);下面我们是PHP脚本，首先我定义MYSQL的信息。
$server = "localhost"; //你的服务器# w" G1 W/ X5 a* B
$db_user = "root"; //你的mysql的用户名
$db_pass = "password"; //你的mysql的密码9 a: s7 b; l4 B3 Z- r
$database = "users"; //表的名字设置统计的时间(多少秒内在线人数)
$timeoutseconds = 300;取当前时间。& z" K0 D" [- U7 y( i* ]$ A
$timestamp = time();上面的完整代码：/ v4 a/ V0 A- X
<?php
$server = "localhost"; //your server
$db_user = "root"; //your mysql database username
$db_pass = "password"; //your mysql database password if any! V1 O- A* t4 h% J  m! M/ \
$database = "users"; //the db name1 _- }' v  Z% [) R7 B; y) U" v/ ~8 G
$timeoutseconds = 300;//timeoutseconds limit2 j6 R" N* G& w# b% H
//get the current time
$timestamp = time();
//calculate the lowest timestamp allowed% C! L& t5 J( \/ G9 b; U+ K* b
$timeout = $timestamp-$timeoutseconds;+ ~. D! M- s5 {- P
?>连接mysql  N0 x, f- p/ a
mysql_connect('localhost', 'username', 'password');也允许使用变量形式。: r' p3 H9 |1 |$ f8 ?0 l5 U
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。6 X3 F0 B6 B0 K( v) g( S* W6 \5 K2 I6 r
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES  b  f: f( ~, i- B! j  x
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");+ w! e) A* o: G% l& z% R& l+ ~
如果用户用错误信息的话，这样处理。
if(!($insert)) {
print "Useronline Insert Failed > ";/ W3 w% p  Y. J# S; F
}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
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。% ]) t! f4 c2 M  {3 x8 o
mysql_close();显示在线的人数。1 v2 ?& n' ~; G8 b% k6 G! M
if($user == 1) {
print("1 user online\n");
} else {
print("$user users online\n");
}最终把上面代码写成一个PHP文件如下。( v) X# T1 @) I) q' z
<?php: {( F* x1 r5 W
//Put your basic server info here
$server = "localhost"; //normally localhost& O7 q* x7 {; y) G# V
$db_user = "root"; //your MySQL database username
$db_pass = "password"; //your MySQL database password
$database = "users";
$timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably are$ X" b2 M$ Y* R
// offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last/ J1 h7 K2 y( ~. E; u
// $timeoutseconds seconds)
//this is where PHP gets the time( C6 o9 o& h) ~6 F  ~
$timestamp = time();
//counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed% [5 `& K+ N) C# @1 R
$timeout = $timestamp-$timeoutseconds;7 n. M2 W! i1 {% `
//connect to database3 z* D9 E3 N/ |4 H* e
mysql_connect($server, $db_user);
//add the timestamp from the user to the online list
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES4 ^1 U; V9 w1 u
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");/ [* x1 c0 [' D" `$ w
if(!($insert)) {
print "Useronline Insert Failed > ";
}
//delete the peoples which haven't been online/active in the last $timeoutseconds seconds.- C* a1 ?9 ^- ]8 ~* P
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");7 Z7 I2 t5 n! U$ H* y
if(!($delete)) {
print "Useronline Delete Failed > ";& l  z9 `) j; i
}
//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)) {
print "Useronline Select Error > ";
}% L% x4 K0 x% K0 V9 c
//Count the number of rows = the number of people online
$user = mysql_num_rows($result);
//spit out the results4 t; Z7 D9 |. S- }! W4 E- G
mysql_close();
if($user == 1) {
print("1 user online\n");
} else {
print("$user users online\n");
}6 C! X2 P0 y8 w2 [
?>$ @, w( ?+ j! 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。
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。( ?( j1 p; T& R- v
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。: q3 H+ a2 F/ i5 s& q- p; J3 z
当然啦，这两款主机也是相当不错的。6 j# @4 m9 v# `# q! u1 v! I5 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8 g/ s, H0 f5 z& p( W; e: H. g) A) c
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& S: Y7 ?5 z1 G9 r& z. z; P
提供一下这个公司的联系方式：请见：http://www.now.cn/vhost/ / h* U/ _( p) c! U" u+ f0 b
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
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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