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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！1 j: ^8 V, |2 n9 K; {3 w
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。
CREATE TABLE tablename (: D! z1 K- J9 R  }3 V
field type(max_length) DEFAULT 'default_value' (NOT) NULL
}可以使用的SQL语句。$ I' r( D' g0 K$ g  w3 X
CREATE TABLE useronline (
timestamp int(15) DEFAULT '0' NOT NULL,) _' P1 y( y% P+ _8 A) k6 h
ip varchar(40) NOT NULL,' d" A# _: `) _( |* B
file varchar(100) NOT NULL,, S, O+ V; a0 _! D$ |% G2 p* n
PRIMARY KEY (timestamp),
KEY ip (ip),
KEY file (file)
);下面我们是PHP脚本，首先我定义MYSQL的信息。$ g7 U' U* C+ O4 K: M
$server = "localhost"; //你的服务器, P1 @4 f- D9 S1 v
$db_user = "root"; //你的mysql的用户名6 @: E4 ?: A( e$ d. Q
$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): Z2 v3 U. X8 G( Z/ @, ~. h
$timeoutseconds = 300;取当前时间。
$timestamp = time();上面的完整代码：
<?php
$server = "localhost"; //your server# N6 d' \" U- C) a6 T6 I+ [1 Z
$db_user = "root"; //your mysql database username
$db_pass = "password"; //your mysql database password if any$ D; x3 \* c4 `* m8 M
$database = "users"; //the db name
$timeoutseconds = 300;//timeoutseconds limit
//get the current time2 B" R: j. u/ m# I, I
$timestamp = time();& D4 l- L# @! c. S: `* Q0 R  ?( R
//calculate the lowest timestamp allowed
$timeout = $timestamp-$timeoutseconds;3 B' Z( }$ \; v. _7 v! C8 l: w6 s
?>连接mysql
mysql_connect('localhost', 'username', 'password');也允许使用变量形式。
mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接% y/ z/ y# b( U$ W/ {1 `+ H
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
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
如果用户用错误信息的话，这样处理。# X9 z* N8 {, ]/ E( F: M
if(!($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<$timeout");同样给出删除记录出错的处理。3 p/ w: l0 a' I
if(!($delete)) {
print "Useronline Delete Failed > ";" h2 u  Z( A9 H$ O7 l+ G6 l1 Y7 g9 Q
}下面我们解决数据库中不同IP的问题; r6 C$ O8 p% a8 C. ?8 B1 j
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用& [5 X% t& k/ U. V$ T
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。
mysql_close();显示在线的人数。0 K0 x6 r9 c" C; I. S4 z/ a) D
if($user == 1) {
print("1 user online\n");! e' c: s3 b3 C3 M
} else {3 J- w1 a) x2 ~/ G
print("$user users online\n");, q6 G4 t' m% q, {5 M0 ~0 l. k
}最终把上面代码写成一个PHP文件如下。
<?php
//Put your basic server info here
$server = "localhost"; //normally localhost/ O9 e1 T( q/ [% Z' E& ~
$db_user = "root"; //your MySQL database username
$db_pass = "password"; //your MySQL database password
$database = "users";) ~. R( u  ?- _. X2 A0 o7 E  ]
$timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably are0 ~+ x! y0 p; ~( Y( b
// offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last/ h: a6 ~+ ]1 s" H- _# N. A- C
// $timeoutseconds seconds)
//this is where PHP gets the time
$timestamp = time();8 [" w" M; s- G: h
//counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed
$timeout = $timestamp-$timeoutseconds;: `" ?( n$ ]+ b' i
//connect to database7 E. M$ `$ b' F- C4 F
mysql_connect($server, $db_user);/ ]- z- h+ _( f9 ~! A: E
//add the timestamp from the user to the online list" U' Y4 g) J+ R( a& Q
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");$ `" e  i6 C* {- t) T) `7 d
if(!($insert)) {
print "Useronline Insert Failed > ";
}! D2 R. m: m% H$ \! P& h
//delete the peoples which haven't been online/active in the last $timeoutseconds seconds.
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");. s; J, a. M+ j
if(!($delete)) {8 o/ n- j1 q/ ]8 K
print "Useronline Delete Failed > ";! \& w3 e0 ]0 |& R
}1 s" [- m% }+ m! R6 Z+ @
//select the amount of people online, all uniques, which are online on THIS page) y' x5 Z, i; N& D
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");
if(!($result)) {0 U, v3 U! t9 B. |6 H$ C2 @
print "Useronline Select Error > ";
}$ e% K5 V3 Q$ f+ S/ j! E
//Count the number of rows = the number of people online; ?8 `. X+ e: w
$user = mysql_num_rows($result);
//spit out the results! w, R  H" [7 K+ G$ e$ E8 U
mysql_close();1 N' V' G- Q- y7 l6 U
if($user == 1) {
print("1 user online\n");
} else {
print("$user users online\n");
}9 \6 Z& h' o! x
?>4 |- |) s# T' @. \1 A

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。
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; L8 ^7 [( O7 d- ~& I" v
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$ N1 |# l) T8 A, q' ^
提供一下这个公司的联系方式：请见：http://www.now.cn/vhost/ 1 v5 l/ H3 z( I0 \7 [
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" X6 Q% o9 S6 k" g1 D
自己加QQ去问吧。

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