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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！6 p1 @; A% }- ~
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。3 V- n* W! R9 @" i' |3 I7 s8 ^
CREATE TABLE tablename (* _( y3 v! Z, c+ N9 ?& h; [
field type(max_length) DEFAULT 'default_value' (NOT) NULL4 W2 ~8 Q/ i) y/ e7 G
}可以使用的SQL语句。1 W! \8 d- s% {
CREATE TABLE useronline (+ p, ]% B6 i4 \: |# I
timestamp int(15) DEFAULT '0' NOT NULL,
ip varchar(40) NOT NULL,
file varchar(100) NOT NULL,& w9 ?! S% ]. [$ A# x+ c/ ]# K# z9 ]
PRIMARY KEY (timestamp),7 C8 Y+ _  _. ]  L3 A6 ~( f/ b9 Y# |" L
KEY ip (ip),1 C, s) t5 y( p3 B2 C* B& J- V0 s
KEY file (file)* ^+ V6 D5 j3 C" s6 u7 h
);下面我们是PHP脚本，首先我定义MYSQL的信息。6 C, v; k, p, j9 t/ T
$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)
$timeoutseconds = 300;取当前时间。
$timestamp = time();上面的完整代码：9 o9 a( ^8 N0 Z1 F
<?php. b2 ~, Q. \$ n+ e2 m/ o7 |4 l6 _7 z0 @
$server = "localhost"; //your server
$db_user = "root"; //your mysql database username
$db_pass = "password"; //your mysql database password if any
$database = "users"; //the db name* }! Y3 a% N0 }! Z9 l9 V! y
$timeoutseconds = 300;//timeoutseconds limit& d' d. {; c: \$ f0 G: J, d
//get the current time
$timestamp = time();: I" a. L  Z8 ^5 P
//calculate the lowest timestamp allowed# y# f. d$ m' E
$timeout = $timestamp-$timeoutseconds;- k4 f0 j$ W. y! G# y6 c% K& [  L+ k
?>连接mysql
mysql_connect('localhost', 'username', 'password');也允许使用变量形式。$ ?6 z5 L. Q7 m; i
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：0 ]/ u2 l/ i1 t' N  ~1 b
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']."','".$_SERVER['PHP_SELF']."')");
如果用户用错误信息的话，这样处理。9 \3 W- h5 t6 R) |1 R9 j$ e' K, H6 O
if(!($insert)) {0 ^& d8 ^  m! i2 J
print "Useronline Insert Failed > ";
}然后实现当超过设置的时间就删除该用户记录。* L2 A- @8 {% U3 t9 U3 ]  a% f1 y9 L
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。
if(!($delete)) {4 S% }, u2 ?! L+ H. \* R
print "Useronline Delete Failed > ";: P& r. J( ?0 ?5 p8 Z
}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8 _( b# [  `7 F# q2 e" `; g
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。6 b4 L" T: v/ N- l& G9 ?" J/ T
mysql_close();显示在线的人数。
if($user == 1) {# f/ m0 p4 b) q5 k% }6 H4 H
print("1 user online\n");
} else {. Q+ v' x; m" g7 e4 ?5 D- X9 h5 g
print("$user users online\n");& u+ G" }% j6 j0 z0 O' |
}最终把上面代码写成一个PHP文件如下。
<?php( S8 Z5 l) @8 z. Q. q
//Put your basic server info here# x  w! Y2 C, S2 k% T9 c( U0 J
$server = "localhost"; //normally localhost( P& A6 W- {; s+ M
$db_user = "root"; //your MySQL database username/ {# {3 v* _/ D
$db_pass = "password"; //your MySQL database password$ c# a. p* T/ s$ {" `% [9 n
$database = "users";$ k* b4 ~7 V: T( ^) o
$timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably are
// offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last+ I0 [' w+ N0 U! q/ c0 x
// $timeoutseconds seconds)! F: W! w% V/ A+ B: T6 q: J% \' e
//this is where PHP gets the time' u# a7 h- m& w3 `: t1 ^% d
$timestamp = time();
//counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed; X" L6 E4 }  S& S
$timeout = $timestamp-$timeoutseconds;
//connect to database
mysql_connect($server, $db_user);/ U" S8 \7 s4 `4 F# N; }( i
//add the timestamp from the user to the online list2 c& b  d% X4 k/ U: z
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");& b( @& X5 E% Q+ E
if(!($insert)) {& l2 w( u8 i7 @0 ]
print "Useronline Insert Failed > ";& w0 l% W) o9 W' G; T
}
//delete the peoples which haven't been online/active in the last $timeoutseconds seconds.& L9 b6 [) D& \, G1 h
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");7 s5 y& k: y4 W4 ]' R- b, }- w# k5 b9 G2 N  A
if(!($delete)) {6 X8 \. `' c) B9 ]) W' r3 p
print "Useronline Delete Failed > ";
}
//select the amount of people online, all uniques, which are online on THIS page) ^8 D% q- J7 K
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");
if(!($result)) {- ^" v: S7 y$ k4 |: r% t
print "Useronline Select Error > ";
}
//Count the number of rows = the number of people online; D1 ~7 g2 v, x7 O) G# Z) o" ~
$user = mysql_num_rows($result);; n; c/ H4 I% L  k
//spit out the results$ K# p& u3 ^4 c9 Q, Y7 ?
mysql_close();
if($user == 1) {
print("1 user online\n");3 N$ ^9 E' p. N4 s& _6 P* F6 v( M
} else {9 S0 P8 K" R& _' @, Y
print("$user users online\n");7 @. T( Y4 J! u# |( a
}/ q# T$ N& U* w& d
?>$ U9 v9 o, [$ f) q

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。+ J; o) i' v. J& D7 ]0 n8 W
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。! N' _ i# o6 L9 b) y; A1 p" j" P& M
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。# T: v+ C, S8 ?. p' |
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1 P3 _/ c& m8 ]; I! o* A
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