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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!%aZ4Xt?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。5DRGe v!Ki*a6H2m
首先我创建MYSQL数据库表。'iE4F;B \ ~ X
CREATE TABLE tablename (!`%x#b p9\,a
field type(max_length) DEFAULT 'default_value' (NOT) NULL:\C)?+nt#qR~]
}可以使用的SQL语句。
6asP%{j!B A CREATE TABLE useronline ("I ZY Z3aqz H$Y
timestamp int(15) DEFAULT '0' NOT NULL,
.SsN/Sv2R@J ip varchar(40) NOT NULL,o+Sq"P|1m-{GP?
file varchar(100) NOT NULL,
9w-Q_1uX4bR PRIMARY KEY (timestamp),4t,ZvR%~_
KEY ip (ip),
r!V d3Tk1^*a KEY file (file)
L*R Mt0kCSm );下面我们是PHP脚本,首先我定义MYSQL的信息。
,l7? Cz(B;]V:f $server = "localhost"; //你的服务器
1`3grl+J)@ $db_user = "root"; //你的mysql的用户名
#s d't*kE^O $db_pass = "password"; //你的mysql的密码
!U;z/{7haM{~(n $database = "users"; //表的名字设置统计的时间(多少秒内在线人数)
pA$f*GW $timeoutseconds = 300;取当前时间。Mt.W7d_Jf"r+H
$timestamp = time();上面的完整代码:
nt.|6K0\,u <?php
X4lx4t(_ D5o $server = "localhost"; //your server^s|&? UQJ
$db_user = "root"; //your mysql database username5Hx3b8}z0{6u
$db_pass = "password"; //your mysql database password if any3Az4{0W0aN |
$database = "users"; //the db name
K!nR2h/O $timeoutseconds = 300;//timeoutseconds limitk~0z#^x{%du
//get the current time
&[M!K#O.O $timestamp = time();H |B [m@^V
//calculate the lowest timestamp allowed
S.L:k+nI J $timeout = $timestamp-$timeoutseconds;)vT8|]#qZ
?>连接mysql
ixML_ mysql_connect('localhost', 'username', 'password');也允许使用变量形式。4zu2pq4fdycB^'J9h
mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接 kE#s5f(d7O L\
mysql_connect($server, $db_user);查询数据库的代码:bF6v/_V)MR
mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。
4@zfTk ~$v $insert = mysql_db_query($database, "INSERT INTO useronline VALUESD [a6^o?
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");OYt4W1t1?FT `$l
如果用户用错误信息的话,这样处理。
~ N+X-UX U if(!($insert)) { j)Q0^"OE C5Ft
print "Useronline Insert Failed > ";0MXiw0T
}然后实现当超过设置的时间就删除该用户记录。Y:r&JECi!]Q-q
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。`XWsA)?x0Tr
if(!($delete)) {%EV"`D9[-T
print "Useronline Delete Failed > ";
!Xf n,~q }下面我们解决数据库中不同IP的问题7n D-f z4t
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用 ]/t$c ]_
mysql_num_rows(query);来统计用户,代码如下。
u8c^}%KD.c $user = mysql_num_rows($result);最后关闭数据库。~'i'@ T9p] u r#k
mysql_close();显示在线的人数。
W-y)IOrv if($user == 1) {
p*r#?%Zw#X*RM/b print("1 user online\n");G"R/W"G^d6Y
} else {
l8R8@Y u6gv print("$user users online\n");'qr^g r'H,w3_7@
}最终把上面代码写成一个PHP文件如下。&@)c3A(_y]/hO(^
<?php
/N |got.TU //Put your basic server info here
5flTjg{4[%@J $server = "localhost"; //normally localhost
5t Kv!h-t2cV $db_user = "root"; //your MySQL database username
9OG}_/y7zM-ta $db_pass = "password"; //your MySQL database password
*jJ o T,k%f%XA $database = "users";FO3CE\$j.r"e[
$timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably are
k-dCG!Wt_'o // offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last
u7mm]%S3{#J?(o // $timeoutseconds seconds)
#q~"W |B1Q9Q //this is where PHP gets the time
},Q s|h-~ n $timestamp = time();
~k:w rm\0g5q\u,u //counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed
8b8h0`.`(?6] $timeout = $timestamp-$timeoutseconds;
YF(F u)u&F{ //connect to database*\9RWg D;iQXEg
mysql_connect($server, $db_user);
|ey,aW!L6g^s //add the timestamp from the user to the online list
?Nb N.oY $insert = mysql_db_query($database, "INSERT INTO useronline VALUES[pb~VZ`0n ~%t
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");w;S8o BS'n/gP
if(!($insert)) {8x&eq ^%s-|-@
print "Useronline Insert Failed > ";
,`J.^4Q:`|s:s }
(p\b&hld7N //delete the peoples which haven't been online/active in the last $timeoutseconds seconds.'GW\FgM:G
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout"); e T'D |(L0\7Q
if(!($delete)) {
l DN| @ print "Useronline Delete Failed > ";
*NEY3vX6{!\!k| }
D _ @!| ZW)O*GD //select the amount of people online, all uniques, which are online on THIS page w%NR{.hg:l6j p
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");
.ndv"{N} if(!($result)) { vA:} ^LgT
print "Useronline Select Error > ";#QA0j{9G^
}
&d"d5V)Y:r //Count the number of rows = the number of people online\.W'pfW8x
$user = mysql_num_rows($result);H t N9q6l\e5O
//spit out the results
5E)YVF7v3A%g1] mysql_close();
&hxq5u p q,v7dJJ if($user == 1) {
2}Bt)nWE_P\t0N6Z_ print("1 user online\n"); t1a k3q~:u:P-@
} else {
%r1x5S9WW print("$user users online\n");
-b3m8z_f9j }
3w_M[E _ ?>!LW%Z D K)aUma
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[ W'S.JQ n9J 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。
Z+M z'qx+R8Ao_4}$u'r&[ 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。
U'tV1Uq/m\@"F 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。v.l:iay0W:fx
当然啦,这两款主机也是相当不错的。
-LgB6X@~6uV(X!mz 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
%^E4A4rD7Yy'M 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
D*tW;@/v%qk 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] &cas(C&q.bP0}
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G9X4w)d%J1{p 自己加QQ去问吧。

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