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！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。"K/I R#Y A+q2kH
首先我创建MYSQL数据库表。Z2go*xfa'\ h
CREATE TABLE tablename (
field type(max_length) DEFAULT 'default_value' (NOT) NULLX}'y4PQ.R bl8F
}可以使用的SQL语句。
CREATE TABLE useronline (
timestamp int(15) DEFAULT '0' NOT NULL,
ip varchar(40) NOT NULL,
file varchar(100) NOT NULL,,_l3Zx0pC6Y1{b
PRIMARY KEY (timestamp),JpO.r4x{&iL*N
KEY ip (ip),2[ T)a!^(W:TR
KEY file (file) ` Cw%^i&K
);下面我们是PHP脚本，首先我定义MYSQL的信息。
$server = "localhost"; //你的服务器snp [&gZ
$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).L*a8R3^ S%_
$timeoutseconds = 300;取当前时间。F5b? U \!M
$timestamp = time();上面的完整代码：
<?php*Tf*|V_.[ _
$server = "localhost"; //your server,ycE|N`R
$db_user = "root"; //your mysql database usernames.J T6A9H`s
$db_pass = "password"; //your mysql database password if any
$database = "users"; //the db name
$timeoutseconds = 300;//timeoutseconds limit
//get the current time
$timestamp = time();Fp dn8P)vv
//calculate the lowest timestamp allowed$VqMA*} ? n6l
$timeout = $timestamp-$timeoutseconds;
?>连接mysqlo tjm_'h
mysql_connect('localhost', 'username', 'password');也允许使用变量形式。
mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接 \ s%G ~0~ D
mysql_connect($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。'c-bJ"DSS"wm?W*G
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')"); NKVQ.C [/JM
如果用户用错误信息的话，这样处理。
if(!($insert)) {rc'YO"O
print "Useronline Insert Failed > ";
}然后实现当超过设置的时间就删除该用户记录。 ^0Xir7v8l o!@ qg
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。-C6RX j&@]c-\ K
if(!($delete)) {
print "Useronline Delete Failed > ";Pl)f b k1z { \S]
}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*_J l7h-T O G p
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。+[4t @t~7j0S8H.AGX
mysql_close();显示在线的人数。
if($user == 1) {
print("1 user online\n");
} else { V r9I QT t
print("$user users online\n");yv j_(NxF ? D"K2f
}最终把上面代码写成一个PHP文件如下。
<?php"Fr G iA1u
//Put your basic server info here\7}*m O&M}*z;_
$server = "localhost"; //normally localhost%gq`%N)VA
$db_user = "root"; //your MySQL database username
$db_pass = "password"; //your MySQL database passwordzB'c!s3_^,o
$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
// $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 database
mysql_connect($server, $db_user);
//add the timestamp from the user to the online list
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
if(!($insert)) {
print "Useronline Insert Failed > ";
} PuWe.Cs2la(b0s1I
//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)) { P T k2Dh$Ts;t
print "Useronline Delete Failed > ";7N#M!N/Y,F#O%n*}'m8j
}
//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='".$_SERVER['PHP_SELF']."' ");
if(!($result)) {6Z,n2KA R
print "Useronline Select Error > "; m.|0EN G
} br5C R#m'e/nTG
//Count the number of rows = the number of people online#dri bD ^@.Wz
$user = mysql_num_rows($result);
//spit out the results
mysql_close();
if($user == 1) {
print("1 user online\n");
} else {
print("$user users online\n");
}ODy%|s6tb {#`w
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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。.T"v*u x1G ki `
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。$pv{"F0i5JS y
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。#@4kt s!nKY w"e
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
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自己加QQ去问吧。
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