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！0 N& H7 G! N/ H/ r' F
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。7 k$ B4 |/ n, W4 E
首先我创建MYSQL数据库表。9 `6 m4 b) z9 a% _. l0 ^
CREATE TABLE tablename (6 @7 U4 ?. R! Z& Q+ R( I
field type(max_length) DEFAULT 'default_value' (NOT) NULL4 ^. u6 ]) V( m7 n: B: S
}可以使用的SQL语句。
CREATE TABLE useronline (1 P, E; p$ J: @! H
timestamp int(15) DEFAULT '0' NOT NULL,% a0 w" Y' ]+ H. E  `
ip varchar(40) NOT NULL,
file varchar(100) NOT NULL,
PRIMARY KEY (timestamp),
KEY ip (ip),& t' Y& L9 }& s9 X6 a
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1 w, T1 F8 \! {4 s! v: K- g% Y
$db_user = "root"; //你的mysql的用户名* d; |' H; @+ f& v# D. I
$db_pass = "password"; //你的mysql的密码% K7 o1 Z( d# \( x  S
$database = "users"; //表的名字设置统计的时间(多少秒内在线人数)
$timeoutseconds = 300;取当前时间。! H1 K5 K6 i$ P* A
$timestamp = time();上面的完整代码：
<?php
$server = "localhost"; //your server
$db_user = "root"; //your mysql database username* f5 m% s; ]0 q4 b
$db_pass = "password"; //your mysql database password if any
$database = "users"; //the db name  j4 K0 {0 a& b' ~! M
$timeoutseconds = 300;//timeoutseconds limit
//get the current time
$timestamp = time();
//calculate the lowest timestamp allowed
$timeout = $timestamp-$timeoutseconds;
?>连接mysql! R1 j% Q: O; G. Z* X
mysql_connect('localhost', 'username', 'password');也允许使用变量形式。
mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接1 Y  |4 t( y4 J
mysql_connect($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']."','".$_SERVER['PHP_SELF']."')");
如果用户用错误信息的话，这样处理。. b6 h  x! O3 i$ S7 ^5 ?) M+ O
if(!($insert)) {, F$ d) x; g4 j' R0 z# g, R1 f
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<$timeout");同样给出删除记录出错的处理。2 o) o: c( C8 h  K: c' o+ m
if(!($delete)) {- ~! c5 W" n0 [, N  {3 F! j. y
print "Useronline Delete Failed > ";
}下面我们解决数据库中不同IP的问题4 o# h% r! Y% @
$result = mysql_db_query($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。& N" w" _, @7 _% [% x6 ^
$user = mysql_num_rows($result);最后关闭数据库。7 m# I. r. u! x" z
mysql_close();显示在线的人数。
if($user == 1) {4 O5 Y5 @2 v  N. J( I' r# s+ s
print("1 user online\n");- H1 ^9 w- [9 w6 U
} else {
print("$user users online\n");4 N: h5 q( A4 Q3 L" q% U
}最终把上面代码写成一个PHP文件如下。, g. y3 F  x/ p
<?php6 W6 [0 `) ]9 C. C
//Put your basic server info here
$server = "localhost"; //normally localhost, k3 e' b. D, ~2 C" g& L& Y
$db_user = "root"; //your MySQL database username
$db_pass = "password"; //your MySQL database password; `) ^6 |! H; t2 p' R1 i6 r
$database = "users";
$timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably are, C. R5 D" z: L; ?. H# \/ j/ L
// offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last
// $timeoutseconds seconds)
//this is where PHP gets the time
$timestamp = time();3 i5 e- H5 t1 U2 H4 n9 A  ^
//counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed
$timeout = $timestamp-$timeoutseconds;/ B  t  l2 E8 K6 T
//connect to database6 f& n7 _3 H$ c1 n1 Q& j
mysql_connect($server, $db_user);
//add the timestamp from the user to the online list
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES0 e# E( d7 ?- }: R" P* L+ ?/ v
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
if(!($insert)) {1 \4 [7 z, A/ \1 P4 Q0 M0 F. i
print "Useronline Insert Failed > ";+ w  ~& b# n: O3 f! N
}
//delete the peoples which haven't been online/active in the last $timeoutseconds seconds.
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");; R! i% [% R- x
if(!($delete)) {
print "Useronline Delete Failed > ";0 c; D% O. {0 Q) v, \7 m
}
//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='".$_SERVER['PHP_SELF']."' ");2 b6 W4 h1 w, J1 `* O  T) }
if(!($result)) {5 p; j0 G' R# b) S' X
print "Useronline Select Error > ";
}
//Count the number of rows = the number of people online4 d9 ]4 h' i" w/ c+ n& O
$user = mysql_num_rows($result);4 Q  Y; N$ b4 k8 U% \9 h- j0 ?
//spit out the results! k9 g9 I) C/ h0 x% N7 {
mysql_close();
if($user == 1) {( K7 m3 I& Z' f( A5 @8 k- e. F: d* ]
print("1 user online\n");
} else {3 O5 K& t5 E. M6 @9 o! f! N; E
print("$user users online\n");
}  `# u  s/ c0 r( z! g3 U" z& k
?>

* @7 Z0 E8 U% X: L/ c
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。/ i0 |& Y9 l! D- F7 g
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。; r  W, A8 P% C
当然啦，这两款主机也是相当不错的。0 N- N8 S1 {$ V& m. ?1 s
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# U4 X* K- V( b3 o3 l
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3 y" u* y7 r. f  w: Q* d
提供一下这个公司的联系方式：请见：http://www.now.cn/vhost/ : R7 W$ {0 u1 ]4 n
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! Z' R! \8 A0 G4 F7 Y& U
自己加QQ去问吧。

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