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标题: 刚用PHP写了一个网站在线人数的程序，请大家进来指点下！ [打印本页]

作者: lilcy88 时间: 2008-5-28 10:40 标题: 刚用PHP写了一个网站在线人数的程序，请大家进来指点下！

刚用PHP写了一个网站在线人数的程序，请大家进来指点下！" P1 i4 x, c, V3 K( k( n0 @9 ?3 w. x: ]" g
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。8 p7 b: ?3 U2 A. F# S! X* v. ~
CREATE TABLE tablename (
field type(max_length) DEFAULT 'default_value' (NOT) NULL) g3 m& f! ]; J. P$ H  @7 W9 o; B# l
}可以使用的SQL语句。
CREATE TABLE useronline (* w& Q5 ~9 S, v7 f
timestamp int(15) DEFAULT '0' NOT NULL,6 R( u8 ]( ^+ O) b6 L3 c- I4 p& I3 [
ip varchar(40) NOT NULL,- L9 ]# a3 `1 y3 \; G
file varchar(100) NOT NULL,* F% W. ?1 n5 i; [. |  c
PRIMARY KEY (timestamp),  K1 n- {4 l) W) A
KEY ip (ip),- k4 E& L& ?4 O% g) r
KEY file (file)
);下面我们是PHP脚本，首先我定义MYSQL的信息。
$server = "localhost"; //你的服务器( ?- M8 H+ i# p6 q# B- z* z
$db_user = "root"; //你的mysql的用户名: x1 R% V1 @* l+ ~% w
$db_pass = "password"; //你的mysql的密码' k! {/ `8 l1 I3 K
$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。4 t2 x" L; I! Q5 m3 l; L
$timestamp = time();上面的完整代码：
<?php
$server = "localhost"; //your server
$db_user = "root"; //your mysql database username
$db_pass = "password"; //your mysql database password if any: F$ [3 G3 F$ d& _) ^6 I; i0 y7 ]
$database = "users"; //the db name
$timeoutseconds = 300;//timeoutseconds limit
//get the current time
$timestamp = time();* c& y' @  l; F$ C9 c! Y( M- O6 _
//calculate the lowest timestamp allowed
$timeout = $timestamp-$timeoutseconds;
?>连接mysql9 e6 \! q8 I+ w
mysql_connect('localhost', 'username', 'password');也允许使用变量形式。
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。
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES/ E( B3 d$ F+ b$ y/ }
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");4 D' a2 m# G, ]1 C+ e9 S3 U2 y
如果用户用错误信息的话，这样处理。
if(!($insert)) {- ]* L, z; H7 U2 i1 U
print "Useronline Insert Failed > ";
}然后实现当超过设置的时间就删除该用户记录。- t) a1 w' G0 y0 C
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。" `  Z+ [4 x; g+ D$ |
if(!($delete)) {
print "Useronline Delete Failed > ";
}下面我们解决数据库中不同IP的问题; `  d4 e1 p' l) m
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用4 W) {: w' R0 g
mysql_num_rows(query);来统计用户，代码如下。; T5 \* g0 P  ?: H2 ^& ^
$user = mysql_num_rows($result);最后关闭数据库。
mysql_close();显示在线的人数。% T. a$ [/ V  ?
if($user == 1) {
print("1 user online\n");
} else {
print("$user users online\n");( J0 ^7 y# a: C, C
}最终把上面代码写成一个PHP文件如下。& L0 {8 O/ v9 J& a5 n- Z; w
<?php8 Y; F; c" P* E4 e
//Put your basic server info here+ l' K+ k% j3 w$ W! K  f% R
$server = "localhost"; //normally localhost) T" ^/ i2 z2 I9 X$ G& g, D
$db_user = "root"; //your MySQL database username% z, m2 A7 \/ T& j' n; b1 Z7 ?. V0 Q
$db_pass = "password"; //your MySQL database password
$database = "users";
$timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably are3 X0 a$ d$ L/ a: [3 q, ?
// offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last# o1 \- I: j3 j" B$ {" ?
// $timeoutseconds seconds)$ X' L: b( C7 ~5 z
//this is where PHP gets the time
$timestamp = time();4 q& z+ z1 }- Q; Y
//counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed+ |( U0 N5 j( G2 q' Z9 o# @
$timeout = $timestamp-$timeoutseconds;, s0 M" ]1 V, y  M: x/ r8 K- Z
//connect to database9 L4 z8 t; b7 ?# E' M0 f; g
mysql_connect($server, $db_user);
//add the timestamp from the user to the online list
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES% n2 K, s, I5 m. X3 s
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
if(!($insert)) {
print "Useronline Insert Failed > ";
}
//delete the peoples which haven't been online/active in the last $timeoutseconds seconds.3 s$ j- ~2 Q" E
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");
if(!($delete)) {( B: C. M0 j9 |' x5 y& j! z+ f
print "Useronline Delete Failed > ";) K# f4 K3 u2 R6 o2 u+ l3 `* Y( z
}" W- \  A! Z7 ~+ v+ y' V; Z* A3 l
//select the amount of people online, all uniques, which are online on THIS page- \' Z7 I- `8 J, ]/ A1 s6 p
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");. z. ^  n2 s3 ~5 q2 I: j' T7 v
if(!($result)) {1 ^# z* L/ g2 L/ K2 S
print "Useronline Select Error > ";. N3 K6 p" M. P
}' ], P  `" v) ]$ a  M- @
//Count the number of rows = the number of people online3 b$ w; ^; ^( V. S- w
$user = mysql_num_rows($result);1 M9 R7 E( }$ Y' _7 D7 y5 ~6 G# a
//spit out the results
mysql_close();' G2 W! d/ u% c7 x- ^& d7 e
if($user == 1) {3 P6 I7 P& u% f! D; n6 T" K
print("1 user online\n");
} else {
print("$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。
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。# w3 z0 @. c, |: A7 m/ `7 {2 i
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。# y8 I2 x7 N, x3 Q: T' g2 n7 z' t
当然啦，这两款主机也是相当不错的。& e6 L. T' u7 |# A( x
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& U  H" r" b6 ]4 `8 t
提供一下这个公司的联系方式：请见：http://www.now.cn/vhost/ ) |; T, b' p: k; g, M' a5 Z  q
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, @  j8 f, x* ~* v
自己加QQ去问吧。

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