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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！5}HF5b q@e
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_*r&}A/X 首先我创建MYSQL数据库表。6Pq"w1Dp'k,eO/?
CREATE TABLE tablename (
k D2Y&klC4_:j;aN field type(max_length) DEFAULT 'default_value' (NOT) NULL
"j;W4Cjw9e s }可以使用的SQL语句。

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{xu$_$^ CREATE TABLE useronline (
6|0vJ[KE5M timestamp int(15) DEFAULT '0' NOT NULL,
(X}qPCIN ip varchar(40) NOT NULL,#p;@~3S4|;_8x
file varchar(100) NOT NULL,A/hwN1{m'``
PRIMARY KEY (timestamp),
$v$D%`*UJ/J KEY ip (ip),
J"Q]h8_#k\6qMrS5Z KEY file (file)
~#tkx9uN#H} );下面我们是PHP脚本，首先我定义MYSQL的信息。Ak0T
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$server = "localhost"; //你的服务器bYX%I$R/tcW
$db_user = "root"; //你的mysql的用户名
ABm W:X.vl $db_pass = "password"; //你的mysql的密码G\*{4[G2sv(KXu+o
$database = "users"; //表的名字设置统计的时间(多少秒内在线人数)
W)Y-D Q!xg7?b-el EwH $timeoutseconds = 300;取当前时间。
V)\m4}-j[f rT $timestamp = time();上面的完整代码：
EL P8]p&r"H <?php
:?-V*AQ
q(`m4b,{4BT $server = "localhost"; //your server G D|qmF2d+{
$db_user = "root"; //your mysql database username
7sA3Rpd;N;]x J $db_pass = "password"; //your mysql database password if any
[3P7bs~#JA $database = "users"; //the db name/A:LK eS!k
$timeoutseconds = 300;//timeoutseconds limitJ0b%T,h%s0\r
//get the current time
[a/mA%e*o V9` $timestamp = time();!Q7A){;\{y!j*X
//calculate the lowest timestamp allowedf
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$timeout = $timestamp-$timeoutseconds;
"D,nG*}*Yu6`lHO0O ?>连接mysqln#O;E^j$Z+M
mysql_connect('localhost', 'username', 'password');也允许使用变量形式。 y'Ha+H$B$f
mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接zQ9W6Hf~7STs(l
mysql_connect($server, $db_user);查询数据库的代码：
k&qd@(N~(T8H'G$G_ mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。xPE|)vM7h7}X,|
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES
~A7{}"S^ ('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
}a/o2D"p1^z
如果用户用错误信息的话，这样处理。
Dr@$XxE if(!($insert)) {
|j2Uh{.MhH print "Useronline Insert Failed > ";
s ]sd/yg6G }然后实现当超过设置的时间就删除该用户记录。
.k'aY.t6Jg$tsW $delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。5\#Xn2VmEWZ
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if(!($delete)) {
tP}'i/~
print "Useronline Delete Failed > ";5ecS.Mrr l
}下面我们解决数据库中不同IP的问题{mjWk3NM&H
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用0\?!n({MX
mysql_num_rows(query);来统计用户，代码如下。7?XXb!Rg6I6Q:j
$user = mysql_num_rows($result);最后关闭数据库。
M+k#Z#Y}'i mysql_close();显示在线的人数。
D)Lr*^"dqRC if($user == 1) {
7ABiN9b5S print("1 user online\n");wd gy7E
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} else {4e2L7v-Es)L
print("$user users online\n");5?(]6b?T9f
}最终把上面代码写成一个PHP文件如下。0S7CrZ2esTl3w*Y
<?phpLF:K)WC]6b l
//Put your basic server info here
|8ki Rt0b8K $server = "localhost"; //normally localhost
,?!OEbUeb $db_user = "root"; //your MySQL database username
G2?:N\7sk $db_pass = "password"; //your MySQL database password
"\ f)|SX%nsjq#\ $database = "users";2D%^5e%t?
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$timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably areM0l.mxM-Y`&D!M P
// offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last
*T2eL)oYp'o6^ // $timeoutseconds seconds)
1yI&\ JI;q [/v //this is where PHP gets the timec*NJ#bN%` Y
$timestamp = time();#q8a#Gt)c7A(yu
//counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed
:H(u%OT!k7v $timeout = $timestamp-$timeoutseconds;n)Ovy}Q#D0}
//connect to database
m(}7A Jc`2RF,] mysql_connect($server, $db_user);
g`m8TO.P8p //add the timestamp from the user to the online list
lWrq6A $insert = mysql_db_query($database, "INSERT INTO useronline VALUES
P;B6dp6Z ('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");U"pb H2joY;fJ&a
if(!($insert)) {
9\)y!^0U/Gq print "Useronline Insert Failed > ";
z+FI!s.?} }
%d^n C(\:n3n^)sZ //delete the peoples which haven't been online/active in the last $timeoutseconds seconds.
!}zC0~ ?tk%w $delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");3HSlj(zy:{] i
if(!($delete)) {
bBVs"r3s#sB;eL print "Useronline Delete Failed > ";I5i n3TEHH{{G
}
%[!N:cb@YMW //select the amount of people online, all uniques, which are online on THIS page
:}3k#o2H_"HHe $result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");
K;E9w9Ezk if(!($result)) {+~-gA-J+v-J
print "Useronline Select Error > ";
!f4h3T DmVt~-D ~:S }%ld7]c7q`#w2cr
T
//Count the number of rows = the number of people online
Xzx8N g $user = mysql_num_rows($result);
!iNX1m+z Ro"C1^ //spit out the results*eE] qH$]Q9\0j
mysql_close();
S"a.B[c{5J3m\W if($user == 1) {
l(ib$H1OOUO print("1 user online\n");+UO5C$JEX#K
} else {
K.kJ'CG2P7}"L print("$user users online\n");
(f"W C7YOcZT3HS }rg*wS1w{
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[url=http://www.now.cn/vhost/][img]http://b.todayisp.com/bbs/760x90h.gif[/img][/url]3KEb/nBYc6\
以上代码我是在时代互联提供的免费试用主机上测试的，感觉效果还不错，性能很稳定，不信的话你也可以去试试。当然，记得指出我这个程序中的不足先哦。n{3^@F4?+UT~
时代互联是行业内最早开始提供PHP 虚拟主机的公司之一，现在已经是的金牌域名注册商和中国互联网客户满意度十佳单位，产品功能已经非常完善 ，特别提一下几个特有用的功能：数据库自动备份、免费集成繁简通简装版、多域名绑定、多子网站支持、GCDN 网站加速器、镜像加速、高级访问统计系统、支持WAP、可选电信/网通/香港机房。&a+R-|`2{Gv3M*W#P,H B
我之前建站的时候选的是他们公司标准商务E型，因为这款机型还特别支持ASP.NET3.5(3.0/2.0/1.1)/ASP。H$t? D2FYZ(A
当然啦，这两款主机也是相当不错的。
%U GS*\.@ v2f 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
\m0n5p)QbYp4m,] 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#k#Yio N#ac:j&]-m
提供一下这个公司的联系方式：请见：[url=http://www.now.cn/vhost/]http://www.now.cn/vhost/[/url]
P\UYdY2S 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]MVn:j ^
自己加QQ去问吧。

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