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！3 E8 J4 R/ B! v" c4 }  C7 H- 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。5 t: V/ g# j3 Y' p- o  h+ O6 x
首先我创建MYSQL数据库表。
CREATE TABLE tablename (
field type(max_length) DEFAULT 'default_value' (NOT) NULL2 O4 ?0 D7 r/ Y; N8 e' W8 e8 n
}可以使用的SQL语句。
CREATE TABLE useronline (
timestamp int(15) DEFAULT '0' NOT NULL,+ u0 I( j3 z1 W& u1 Q, S0 k
ip varchar(40) NOT NULL,2 ?  }5 \! b$ @- [3 r7 S
file varchar(100) NOT NULL,
PRIMARY KEY (timestamp),! o  D3 }0 ]5 S& N0 u  l, ^5 N$ z1 G
KEY ip (ip),
KEY file (file)
);下面我们是PHP脚本，首先我定义MYSQL的信息。' K' v, Q1 }! a3 u& r
$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: I8 G; s+ D, I1 N: I
$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。5 O  Q: H6 s/ i
$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
$database = "users"; //the db name" K+ ~# X" h0 j- D$ q; R1 c1 X5 m
$timeoutseconds = 300;//timeoutseconds limit
//get the current time
$timestamp = time();" B! a! B. K( q& `; S* y+ t8 f
//calculate the lowest timestamp allowed2 D$ `3 ^/ Q" A
$timeout = $timestamp-$timeoutseconds;% w. ?- J* x8 O, x
?>连接mysql. x; e9 E- H% T1 ^. l- j0 a" |
mysql_connect('localhost', 'username', 'password');也允许使用变量形式。7 b8 C- I' I5 @3 G5 \2 e6 D. P
mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接! a5 s% J4 G9 X9 K* F7 l
mysql_connect($server, $db_user);查询数据库的代码：( `7 W. f( F6 Q) G' N8 {' e0 x
mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。8 Q1 i5 r2 y  s8 R2 o
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
如果用户用错误信息的话，这样处理。, q. \$ |: u% B9 q) E
if(!($insert)) {5 g2 U" q8 U4 ^8 m1 f( C
print "Useronline Insert Failed > ";# g) p1 r+ M$ {5 _+ B
}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 > ";9 _4 O' r' A4 m4 x3 K2 o& R
}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='".$_SERVER['PHP_SELF']."' ");使用
mysql_num_rows(query);来统计用户，代码如下。" Z" }2 _3 b; ^; w$ ]! R, U# s& o
$user = mysql_num_rows($result);最后关闭数据库。, Z9 @/ r( c2 @+ y4 a$ G; f3 a7 t0 z
mysql_close();显示在线的人数。% E% c3 F* F2 I2 @, `3 f
if($user == 1) {+ V: b% G$ N" w0 n/ m2 t/ L" M- b, V
print("1 user online\n");
} else {
print("$user users online\n");
}最终把上面代码写成一个PHP文件如下。
<?php& J& f* l8 _6 }% R4 M$ @" B
//Put your basic server info here2 T( `) \3 h; K' ?; q( o
$server = "localhost"; //normally localhost
$db_user = "root"; //your MySQL database username$ d* i4 Q0 a0 X7 r/ j: j7 q
$db_pass = "password"; //your MySQL database password7 M% L! `" i, z8 W3 ]" b
$database = "users";
$timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably are
// offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last, c$ }) E& T' a8 b1 {0 w1 O* n
// $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
$timeout = $timestamp-$timeoutseconds;
//connect to database4 ~! s# n, i+ D3 e* c  M6 P. [# }  [
mysql_connect($server, $db_user);
//add the timestamp from the user to the online list8 `$ x6 W4 `7 w& M8 s% Y
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES' [2 d4 T. ]* R. ^6 g
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
if(!($insert)) {
print "Useronline Insert Failed > ";3 [/ p: ]2 u7 i9 j5 @/ z
}' w0 m/ _) U% P; O
//delete the peoples which haven't been online/active in the last $timeoutseconds seconds.
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");
if(!($delete)) {
print "Useronline Delete Failed > ";7 |+ x# `  [2 {  K* @5 s+ P
}0 D( N! w; g- e2 r* }9 T7 z
//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='".$_SERVER['PHP_SELF']."' ");- b" x6 n; Z3 w1 P
if(!($result)) {  O$ b5 i! d/ N) E* J% q
print "Useronline Select Error > ";% T/ T2 E- @1 p
}
//Count the number of rows = the number of people online
$user = mysql_num_rows($result);9 y1 l" U  l" \1 z; B( ^# w
//spit out the results$ s: x$ q$ \+ Z" I+ ], o
mysql_close();
if($user == 1) {
print("1 user online\n");
} else {1 t1 Q% |. Q' X7 Z( h
print("$user users online\n");
}
?>4 \% x# M( \/ I# @

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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。4 c3 S$ v+ T) K
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。* d6 D0 ?$ g4 U( {5 B2 _
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7 u' W! \7 L9 h( o9 o) P% w: k
提供一下这个公司的联系方式：请见：http://www.now.cn/vhost/ 8 ^( ?8 F5 o4 i9 Y$ N$ h l
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
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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