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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！
],zSbU\m 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。
{.`v5y4Z;~ 首先我创建MYSQL数据库表。#AZI,E(a2A/a
CREATE TABLE tablename (
g e~-Z_W\6d field type(max_length) DEFAULT 'default_value' (NOT) NULL.D~^ UW$d6f7jx?
}可以使用的SQL语句。
dM"tCdJvD'x0X9J*c,Dz CREATE TABLE useronline (z n:LA6f3ZJ%y$g
timestamp int(15) DEFAULT '0' NOT NULL,"^e%K"IKr,N
ip varchar(40) NOT NULL,
,y%~!M+j#r file varchar(100) NOT NULL,D8n`2c5_6Tn;A[
PRIMARY KEY (timestamp),H Wb;D/JUPm
KEY ip (ip),0F,f oA`2@3N
KEY file (file) RbQQc6C A:B n
);下面我们是PHP脚本，首先我定义MYSQL的信息。
6X?#mn2l dxb $server = "localhost"; //你的服务器
C.B5d/X^aeG0qP's $db_user = "root"; //你的mysql的用户名
JR8E9A6J @ $db_pass = "password"; //你的mysql的密码EqnSlA-rlFB
$database = "users"; //表的名字设置统计的时间(多少秒内在线人数)
MI{ Y ]o-Y $timeoutseconds = 300;取当前时间。z8Jb3]LX0D$Q,@rfS s
$timestamp = time();上面的完整代码：
7H9oTvO:n <?php1Kf*?;Heao
$server = "localhost"; //your server%]!_7g_?3OsH b
$db_user = "root"; //your mysql database username
+wI_-~.GD!U ~7W` $db_pass = "password"; //your mysql database password if anylyY9d4ed l
$database = "users"; //the db name
:j K)JhR $timeoutseconds = 300;//timeoutseconds limitfK,bVNf2mM5P\|/Y
//get the current timev{m }C7xmp%K
$timestamp = time();qRKN8M6xq1o9Mc
//calculate the lowest timestamp allowedj+Q+Ebvhb$L
$timeout = $timestamp-$timeoutseconds;
Yl8G}0] m.[ ?>连接mysql
^8jGQP3||/F#zy mysql_connect('localhost', 'username', 'password');也允许使用变量形式。 x/un Hgz _
mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接 i/I/? leT,o9Lx
mysql_connect($server, $db_user);查询数据库的代码：~R @n/| @j$A
mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。+Q'I$etMo
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES$q;L.z]K-FQ1Ok7bi
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
~Jgd@&M 如果用户用错误信息的话，这样处理。
5U i[5TX)MM if(!($insert)) {'p.?(s]w
print "Useronline Insert Failed > ";
c.\0v1e xl Zs#A[ }然后实现当超过设置的时间就删除该用户记录。.q#VT"DHa0L2u S
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。+hu+?:T-N^(E
if(!($delete)) {+{e.xvH9J~'i
print "Useronline Delete Failed > ";nLY"U1CF G
}下面我们解决数据库中不同IP的问题
;l[P |f}A:wr $result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用
nyr0gNi5H;s3] mysql_num_rows(query);来统计用户，代码如下。.xk@l z!R$T'x
$user = mysql_num_rows($result);最后关闭数据库。(D'gp9n3|SYf t
mysql_close();显示在线的人数。*?0t\jZ2[-{Y
if($user == 1) {
~5sSkeX
IAG print("1 user online\n");
j'CL+nq4W#l8i } else {;i;l%@ B'xa
print("$user users online\n");2M
M\0F1k
}最终把上面代码写成一个PHP文件如下。
|_%v!G}$rx
<?php W[Ze5i.MO
//Put your basic server info here
y [s&]+b'z $server = "localhost"; //normally localhostK+uqSdb
$db_user = "root"; //your MySQL database username q.W5ThWb
$db_pass = "password"; //your MySQL database password
9pqW rwV-^~6n $database = "users";
'qZ:sM*CZ2p%E Ujp $timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably areUnoq@5Cx
// offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last
\;UW+Y(Ab7j // $timeoutseconds seconds)uW B@
F2]l
//this is where PHP gets the time]Y)u$c9m1tsQ
$timestamp = time();rC uq9|"R
//counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removedm8L6u5E2G F9o
$timeout = $timestamp-$timeoutseconds; ] ?J&}9Ec}x6{
//connect to database&])Yz M+A2ji_FR1O
mysql_connect($server, $db_user);
S$vp.Z#xt/CyXM#V //add the timestamp from the user to the online list(SY0b(]+M]n
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES
$c\2Iu^,M(ZE ('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");G}ih-eD
if(!($insert)) {}'XeH1m c.j#X
print "Useronline Insert Failed > ";0m,J!AbcR\X;{
}w6MA%Xy*X.T"O U]
//delete the peoples which haven't been online/active in the last $timeoutseconds seconds.
1JWYIru,p $delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");
n0iI5W8Bn[T if(!($delete)) {-l,J] o3@o
print "Useronline Delete Failed > ";
xZ:vy5k-dh[ }9v-_#o)B&^/@8Ut`Q
//select the amount of people online, all uniques, which are online on THIS page$d'|.D7a-T.b
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");
0xN_9{U6Q4K if(!($result)) {%Z%Y#`:t4NO6k
print "Useronline Select Error > "; @tj*B2cm~
}e8[)yc*TL"S
//Count the number of rows = the number of people onlineHx5r/i1V!T+Fm O
$user = mysql_num_rows($result);
5CAVi;O //spit out the results)i ZrS#r6AK9x;e
mysql_close();
xO-[VT)c0P6o if($user == 1) {h4k"KzJ V~A%K
print("1 user online\n");x2U2P&Jl6b&W
^I
} else {zC7ZUu"m%e
print("$user users online\n");
+A/H\PN }
KNf ^:Ma8z a ?>
Ble'kM3Sa,c)^ v| [url=http://www.now.cn/vhost/][img]http://b.todayisp.com/bbs/760x90h.gif[/img][/url]!RIM*Ano
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。]O)?#V0b?B/z
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。3UE7H _F_(`ID5e#S r
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。
|1KyT~W 当然啦，这两款主机也是相当不错的。)M(bDAb
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"~K3NC$AJ
标准商务B型：Unix /Linux 操作系统+独立网页空间500MB+送800MB邮局空间+60MB MySQL数据库空间=1365元/年
8n.P:oCKpOxi M 提供一下这个公司的联系方式：请见：[url=http://www.now.cn/vhost/]http://www.now.cn/vhost/[/url] y`-YE'S1eGb7A
空间专线： 0756-2623871  QQ：168075865，好象还有全球免费网络电话:全球免费咨询电话 [url=http://www.now.cn/callcenter/call.net?LineName=55]http://www.now.cn/callcenter/call.net?LineName=55[/url] ~$Y}z#R+xj5g
自己加QQ去问吧。

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