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lilcy88 发表于 2008-5-28 10:40

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！
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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。
#x$G.J*Q5pQL1i 首先我创建MYSQL数据库表。5x ^f?E8[v
CREATE TABLE tablename (
!mh$KJdc field type(max_length) DEFAULT 'default_value' (NOT) NULL
c!r5GKl[ }可以使用的SQL语句。j {m0Ud
CREATE TABLE useronline ( ZgcV$N2h#G)suY
timestamp int(15) DEFAULT '0' NOT NULL,
F8~cSf;z ip varchar(40) NOT NULL,
'Q\'s8tv~'Tt0C1Sg7A file varchar(100) NOT NULL,a&~yB6X#YE ^d
PRIMARY KEY (timestamp),
8B]0P Voty?P KEY ip (ip),
/~F&`DS&N@8c8C KEY file (file).n;E-j'p1TB:GI5k
);下面我们是PHP脚本，首先我定义MYSQL的信息。
w*V`0u1M{ [,L$X $server = "localhost"; //你的服务器*B(_(Bs6c
$db_user = "root"; //你的mysql的用户名vE\#Q7q+^h"?
$db_pass = "password"; //你的mysql的密码
;t2h
Y x)D8Y"m8lmD $database = "users"; //表的名字设置统计的时间(多少秒内在线人数)
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$timeoutseconds = 300;取当前时间。Z
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$timestamp = time();上面的完整代码：
H+z#q+zT:lW6b Y <?php
b5O.Gw&x9V $server = "localhost"; //your serverV6dH7k-an
$db_user = "root"; //your mysql database username
Ir+tBF/e/c $db_pass = "password"; //your mysql database password if anyq9O"?2Opr_r y8A
$database = "users"; //the db name,R _U o3K
$timeoutseconds = 300;//timeoutseconds limitW/VF1Uui;{f
//get the current time
~9if[1S"|(h/d#^#CC/v $timestamp = time();
&f5W&kv:H%~#U)~
p^;O //calculate the lowest timestamp allowedJ.e(Q@"|q1L_7N.`
$timeout = $timestamp-$timeoutseconds;+YHNI5Z0qMl
?>连接mysql$Y8C`7d&f{
mysql_connect('localhost', 'username', 'password');也允许使用变量形式。
)S+?b1p%h]kW:i3y:xF mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接!k9~Pm#b%mR5t
mysql_connect($server, $db_user);查询数据库的代码：$DXBS-sY
mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。
9qu@UbKYCj;~ $insert = mysql_db_query($database, "INSERT INTO useronline VALUES(sw1v]1C
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");dl1n)AC e
如果用户用错误信息的话，这样处理。
'A/P#X Wd c{ if(!($insert)) {:T%{;z7MO
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print "Useronline Insert Failed > ";
Y.N:c Y'l*L"]"Ke5W }然后实现当超过设置的时间就删除该用户记录。
;i{CV-]*G
pb'r$U,i $delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。

Ol.q5p;Z6L if(!($delete)) {"X|#pSc
print "Useronline Delete Failed > ";tJ:IG:kQ/wa"A/]
}下面我们解决数据库中不同IP的问题*DI:h4ZI m.]
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用WuH+t+[7[6ox
mysql_num_rows(query);来统计用户，代码如下。MI8t"O"f!@o
$user = mysql_num_rows($result);最后关闭数据库。GoH n"W
mysql_close();显示在线的人数。:?;V9QO2s)E0x$a8k
if($user == 1) {:}"_9G,ycU+FO)q
print("1 user online\n");
)w&N.Bk VuGs.i } else {
Cq A7E2i kNN i print("$user users online\n");
\3l1zE"d.s }最终把上面代码写成一个PHP文件如下。w6Q%iai{]x
<?php[ndOF3^&L8rw/i
//Put your basic server info here
i8^1OOen8QQ X%}$F%^ $server = "localhost"; //normally localhostiOgO|A.{\j
$db_user = "root"; //your MySQL database username Yh,k,ma
$db_pass = "password"; //your MySQL database password*d4v/@/k#A.j i
$database = "users";

RE4QJj6C9qJ $timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably are
)Y$E4?:P)q\L+\ // offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last
q!Vo qCT // $timeoutseconds seconds)
Mco
t-[9].w"n R //this is where PHP gets the time_'o/j
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$timestamp = time();8?]xhRO6fpI
//counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed
#J G1}0j!RVG)ZAC $timeout = $timestamp-$timeoutseconds;8_Tr7qKk qVA}3[
//connect to database
9G!~ZS(r#@1c| mysql_connect($server, $db_user);Ff:Dv7~qk
//add the timestamp from the user to the online list
lFt$|%I,BE;|@1N $insert = mysql_db_query($database, "INSERT INTO useronline VALUESky,ly'j8U:y+v/FV
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')"); L)f&U3J?myE
if(!($insert)) {)MA\qfS"i)j V.p
print "Useronline Insert Failed > ";l$]m6^cZK,@)?
},TeW6lp+t bJ
//delete the peoples which haven't been online/active in the last $timeoutseconds seconds.
9a0~7]:O C,M-A,Qe$` $delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");p `{.m|3Qv
if(!($delete)) {1WK$S;l*T/\
print "Useronline Delete Failed > ";2z
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}.l JC&JL2u%t7e3`p
//select the amount of people online, all uniques, which are online on THIS page
$c#`X-G$}+C D $result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");7b!B wV u%H[@8U{?4g
if(!($result)) {
*w!]lr2U:i"G;lQ print "Useronline Select Error > ";
^_(DF!w/F2`\ }"qCyQW%@@n
//Count the number of rows = the number of people online8fwnzj*^Ec
$user = mysql_num_rows($result);H#g]BwU7v_g7V"XI
//spit out the results
{7zjv/c;g mysql_close();
`PN^n if($user == 1) {
};?^;z}*jM5T print("1 user online\n");
5oG5}+rhrr1M!_@f } else { u2V w4Y)L.bV"}`h
print("$user users online\n");
M&Yq|WJ }
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{b{j;@t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。3D-Z1ze },X2Yyo~i
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。
/H:E
ne!@$jM2_ 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。
6f'Yc1mZ/r3N 当然啦，这两款主机也是相当不错的。
g?/{t"NDdr1p 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
5~'sD3p5oj!dF 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(j{!N/Nw [}}a
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o.RT+w+hC;K 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 [url=http://www.now.cn/callcenter/call.net?LineName=55]http://www.now.cn/callcenter/call.net?LineName=55[/url]
1M9BK cgH-J 自己加QQ去问吧。

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