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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 _# l3 y  J# \1 _: 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。$ i& x6 ~+ }- {4 U5 ~
首先我创建MYSQL数据库表。
CREATE TABLE tablename (
field type(max_length) DEFAULT 'default_value' (NOT) NULL
}可以使用的SQL语句。% n  o5 P. t( B) ~
CREATE TABLE useronline (
timestamp int(15) DEFAULT '0' NOT NULL,* }  l# x! u: k+ x+ T
ip varchar(40) NOT NULL,% I, Z" [5 l; E0 W& L
file varchar(100) NOT NULL,$ w  z: w! T* K+ L6 i; _/ i6 G5 U* L# s) z
PRIMARY KEY (timestamp),
KEY ip (ip),
KEY file (file)0 Y; W! ^' j% V7 n
);下面我们是PHP脚本，首先我定义MYSQL的信息。2 C% N7 e3 s3 B; O4 N
$server = "localhost"; //你的服务器
$db_user = "root"; //你的mysql的用户名( k4 T. {8 A2 f! X
$db_pass = "password"; //你的mysql的密码, y4 b8 l7 _! {9 D, l
$database = "users"; //表的名字设置统计的时间(多少秒内在线人数)
$timeoutseconds = 300;取当前时间。4 A: b& M: L( H& S: L$ }7 F
$timestamp = time();上面的完整代码：
<?php! Z$ T1 y4 d4 S0 w7 X8 a8 m# M
$server = "localhost"; //your server  a, Y$ d, c. u% P+ L2 @8 r
$db_user = "root"; //your mysql database username' \$ |3 [0 [5 v$ t0 c9 B
$db_pass = "password"; //your mysql database password if any
$database = "users"; //the db name. p. \+ H+ _! g" r! T& Y8 r
$timeoutseconds = 300;//timeoutseconds limit/ Y4 R- s% F- A/ u/ r
//get the current time
$timestamp = time();
//calculate the lowest timestamp allowed3 h- f( C3 ^; ^
$timeout = $timestamp-$timeoutseconds;; t6 o! {$ _7 [$ ]9 m( e: A% w
?>连接mysql
mysql_connect('localhost', 'username', 'password');也允许使用变量形式。3 I# _  {' i. h! x$ g" f
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：7 ~( r) x2 f1 o, k2 ?6 c* h, b
mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。/ @3 `+ O1 r( h2 S, Y6 H: d: F
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES3 L, S1 ]- `; w  M: T
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
如果用户用错误信息的话，这样处理。( l+ J) j- q! f1 l% g  {7 r0 M  @$ S
if(!($insert)) {5 H# o+ O, L/ Q# P8 k; W8 v
print "Useronline Insert Failed > ";6 H" ^4 @2 y; ?& E; o2 H' G
}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0 e/ }: E9 E" {
$result = mysql_db_query($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。
mysql_close();显示在线的人数。
if($user == 1) {
print("1 user online\n");: W" u4 E' R& ~( P2 `
} else {
print("$user users online\n");
}最终把上面代码写成一个PHP文件如下。
<?php
//Put your basic server info here( w+ U( ?, Q! b+ Q1 K
$server = "localhost"; //normally localhost
$db_user = "root"; //your MySQL database username# b! H1 I6 g' T$ G! }; A% ]
$db_pass = "password"; //your MySQL database password
$database = "users";
$timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably are, U7 \& d" ~" L4 L1 s7 {' S2 ?
// offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last% N+ W6 L) S! I  z
// $timeoutseconds seconds)
//this is where PHP gets the time% _! r. Y5 \/ R2 d' T8 G1 D
$timestamp = time();9 C' Z( U4 F- m1 \+ [' ~- ]
//counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed
$timeout = $timestamp-$timeoutseconds;
//connect to database
mysql_connect($server, $db_user);4 f$ i3 ?% G3 h
//add the timestamp from the user to the online list: P' j- a$ f  R2 ?
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");! u- @, e) G7 A) `- _* U( l
if(!($insert)) {
print "Useronline Insert Failed > ";$ ^* H* G; m6 x
}6 c7 Y& T8 W/ b/ e9 A! ?) y! B, g
//delete the peoples which haven't been online/active in the last $timeoutseconds seconds.
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");' W  ]3 j6 ~8 q& _8 }
if(!($delete)) {. c, p8 \' O5 h* u/ o4 @- f8 Q
print "Useronline Delete Failed > ";
}
//select the amount of people online, all uniques, which are online on THIS page' ?/ n1 B0 M4 W! I' [' s# N; ~) J" Z
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");: B/ r# v! x4 o4 H3 P# e: b
if(!($result)) {2 |7 z' X5 R/ U0 y+ {% K! Z; g0 S! C
print "Useronline Select Error > ";
}, f: N* |1 \9 E
//Count the number of rows = the number of people online
$user = mysql_num_rows($result);% K* o. e: o- L/ s  z
//spit out the results3 r9 k: N0 E  T  h2 e/ n0 V+ T1 P. X
mysql_close();# a% v. E4 a; L/ w. o, ]: t$ Z
if($user == 1) {, G: s+ v- S5 y6 X# E7 a. H
print("1 user online\n");) \8 \3 L' Z+ f! H
} else {! l- j9 k; P& `8 k, V! O# }) c
print("$user users online\n");% h7 [+ c! L3 Q0 i0 @6 ^
}! a$ N+ V. Z0 F6 F7 k. B3 e) `& Q; P
?>: g. G0 R7 L& g4 a- p

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。+ D, [5 ]% n T& t$ x
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。2 s( N2 O; s+ U% {% [
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
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; E0 w7 n) @8 G& ~
提供一下这个公司的联系方式：请见：http://www.now.cn/vhost/ $ c. |8 I( C1 I
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=553 ?# @% c. W$ k1 |$ i: Y
自己加QQ去问吧。

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