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！, d4 ?# s0 N6 L9 r* d$ K
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。' E1 x: S4 H; N5 Q
CREATE TABLE tablename (* n; y* H3 G% X5 M% x
field type(max_length) DEFAULT 'default_value' (NOT) NULL
}可以使用的SQL语句。6 O' V$ A) A7 r, [6 [7 d
CREATE TABLE useronline (
timestamp int(15) DEFAULT '0' NOT NULL,. ~4 ]$ _6 Y) c2 n
ip varchar(40) NOT NULL,
file varchar(100) NOT NULL,
PRIMARY KEY (timestamp),
KEY ip (ip),# T& G6 k6 N& x; r( N
KEY file (file)2 g( `* R9 ^0 J6 i
);下面我们是PHP脚本，首先我定义MYSQL的信息。( A$ h5 E% L6 L' y$ t% i1 ]
$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)8 C4 o2 h' u" m: y8 I
$timeoutseconds = 300;取当前时间。- B; C: e4 V* `! h. ?0 e8 Y
$timestamp = time();上面的完整代码：
<?php
$server = "localhost"; //your server
$db_user = "root"; //your mysql database username
$db_pass = "password"; //your mysql database password if any5 U) I- E! z; C
$database = "users"; //the db name
$timeoutseconds = 300;//timeoutseconds limit
//get the current time+ b6 Y* `" }- k& d0 ^& j) @
$timestamp = time();
//calculate the lowest timestamp allowed( u8 T7 Q* G) A: A
$timeout = $timestamp-$timeoutseconds;
?>连接mysql5 ]* v8 l  W$ Z* ~- K0 |& d
mysql_connect('localhost', 'username', 'password');也允许使用变量形式。+ Q, A% ~$ Z( l% w2 v, \+ b
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。0 o& a+ z* e; k& k+ [7 F
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES* x$ c6 N  U. G! Y# U! l$ M5 V) ~
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
如果用户用错误信息的话，这样处理。
if(!($insert)) {4 e6 g+ m) b# a: E- j' E
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='".$_SERVER['PHP_SELF']."' ");使用
mysql_num_rows(query);来统计用户，代码如下。' ~+ s$ c2 K, u6 v; M2 |) \$ ]
$user = mysql_num_rows($result);最后关闭数据库。. b% y" x  K  d  c) i
mysql_close();显示在线的人数。) e" G  t1 R5 h" a
if($user == 1) {, Z3 V! s" I; L5 ~+ Y
print("1 user online\n");
} else {. v4 i/ z% {4 ~0 h
print("$user users online\n");
}最终把上面代码写成一个PHP文件如下。! H7 \/ v0 }% @1 ]3 C' @' P3 T
<?php
//Put your basic server info here! U" V  I" `  |4 @* G) N
$server = "localhost"; //normally localhost/ p: u# l( @) m% \
$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 are5 Y; O+ O! U# }0 K4 d' O
// offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last% a$ r4 y# A  r0 O. W/ H( }5 V
// $timeoutseconds seconds)
//this is where PHP gets the time
$timestamp = time();
//counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed' y7 y  }5 o$ m+ a
$timeout = $timestamp-$timeoutseconds;
//connect to database# E, J3 F+ s9 k+ i( k
mysql_connect($server, $db_user);
//add the timestamp from the user to the online list  r6 I: |( i  q3 F7 a
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES- n: Z& s" a5 Q8 l
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
if(!($insert)) {
print "Useronline Insert Failed > ";
}
//delete the peoples which haven't been online/active in the last $timeoutseconds seconds.
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");: t8 G$ l, S& l9 T. e9 \% A) ]& w
if(!($delete)) {% ~0 q; y6 O' F5 U1 T+ C) V
print "Useronline Delete Failed > ";/ f( v+ i& ?8 F
}8 a/ x4 A5 n7 h
//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)) {$ M1 W- ^. W7 d8 O3 `6 K
print "Useronline Select Error > ";
}
//Count the number of rows = the number of people online  I& B% n+ Y8 N1 ~
$user = mysql_num_rows($result);' S# e4 v+ b' L! V0 C
//spit out the results& g3 {* W* Q1 z( i# U
mysql_close();8 L4 I9 }0 e" |. h1 c9 J# I8 W$ R
if($user == 1) {
print("1 user online\n");
} else {' f/ M- N' h2 O; ~# f, C- I& C* [
print("$user users online\n");" d- b) X: Z" n8 U; r6 Z3 h6 J& a0 T
}) Y+ f: ?5 p) D) L5 _  @# |$ b% K0 T
?>

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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。+ U( h. B# u' Q7 d
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。9 Y! R- r6 M' r- `* O
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。# x# I- C4 X9 c5 f( S
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/
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: y$ }/ i- T/ k# I
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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