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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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u 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。
2MMJs@a4N3B,iK 首先我创建MYSQL数据库表。
)`e${+I.d.w#y CREATE TABLE tablename (
i[5j7]!N._} field type(max_length) DEFAULT 'default_value' (NOT) NULLO4mT&cN[
}可以使用的SQL语句。
4X/@)r {f
An |8A CREATE TABLE useronline (^1A+v6A;k
timestamp int(15) DEFAULT '0' NOT NULL,
-Uz"YSL/d;} ip varchar(40) NOT NULL,
)V\Cj&X5G
Y#~-QLm6M file varchar(100) NOT NULL, G0q8KI{ B1K4Z
PRIMARY KEY (timestamp),f4w!Ac0|rX9y
KEY ip (ip),7sue'r C$Jw$]6a
KEY file (file)tb9o'A!w{
);下面我们是PHP脚本，首先我定义MYSQL的信息。Eq6k]`$X4YbS
$server = "localhost"; //你的服务器ZU[E9e*^O
$db_user = "root"; //你的mysql的用户名n;M"b0l3^ K]l$I
$db_pass = "password"; //你的mysql的密码[8dd2M\x#X6im
$database = "users"; //表的名字设置统计的时间(多少秒内在线人数))?!n2IG?T&Mv
$timeoutseconds = 300;取当前时间。_jV%G P"ysh
$timestamp = time();上面的完整代码：

v;h{$V6By7k}0NK <?php;CfWx;b+b:{
$server = "localhost"; //your server^XH])c a@
$db_user = "root"; //your mysql database username a:R{k2ZFs
$db_pass = "password"; //your mysql database password if any
/VY&L&v2w.d$[Ex $database = "users"; //the db namerYWJ.@Q L1Bi3IO
$timeoutseconds = 300;//timeoutseconds limit8irG6x#i2I$CO
//get the current timeAk#D0rw7_au3dB*Y
$timestamp = time();
q&pNZ `J //calculate the lowest timestamp allowed ~ARC+WP-~
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$timeout = $timestamp-$timeoutseconds;ue#@1H}/h-kl R
?>连接mysql4~/a$_^2Fl$zh
mysql_connect('localhost', 'username', 'password');也允许使用变量形式。C1o9Dj9lu$S
mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接
"I l8m-R:x mysql_connect($server, $db_user);查询数据库的代码： ?JeJ0x;V:Q
mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。

b }Y0Jq@ $insert = mysql_db_query($database, "INSERT INTO useronline VALUESE nhGyZ/N[
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");1f6V0X-@-J)y0Jc-At
如果用户用错误信息的话，这样处理。I4Y3s]ZF,bh!w
if(!($insert)) {
,S Jg9u$a print "Useronline Insert Failed > ";
Y'R/eBhu }然后实现当超过设置的时间就删除该用户记录。
&G x8k{9r $delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。
ale[[ \#S9K if(!($delete)) {*sQ&NC&}9Q
print "Useronline Delete Failed > ";`I)r'[cF
}下面我们解决数据库中不同IP的问题
u_5`-wD4a*N $result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用 b6v)ge,Tn:m|
mysql_num_rows(query);来统计用户，代码如下。#]$tC2tb
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$user = mysql_num_rows($result);最后关闭数据库。
7F(?:om5R1I@Y mysql_close();显示在线的人数。L0Glr8m
if($user == 1) {4Xq0R,I'J
print("1 user online\n");
A^r)q:n.xa } else {
x6K/Z*Y[:m'jgm print("$user users online\n");:Z3q6e}h^ i$_
}最终把上面代码写成一个PHP文件如下。
9\P*c@i#l#Rp!c <?php/C'OrH-C
//Put your basic server info hereO'c*Or#~,A!}Kx#E
$server = "localhost"; //normally localhost
Me_$_ l#K:q;j2t3[/o $db_user = "root"; //your MySQL database usernameFgc,X5]
$db_pass = "password"; //your MySQL database password
Y[:Gc:s'? $database = "users";&Y|o|@\
$timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably areK XQ+Q7D rt%@N7Nf
// offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last"x YSOL5u NpI:_
// $timeoutseconds seconds)
]B8R
}4d!Z:n%PN //this is where PHP gets the time
R!kN?\!F8R $timestamp = time();
5M7LG:u-xZ8quI //counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removedkG.VC!Q&lU|/Y
$timeout = $timestamp-$timeoutseconds;
4V5U X
`YY.z //connect to database
v:B3gwU!S;MS9u mysql_connect($server, $db_user); RnIC\K z!I
//add the timestamp from the user to the online listBU%l P*ZO9Y9z9Ui
$insert = mysql_db_query($database, "INSERT INTO useronline VALUESG{'b P[/wOb
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
+U)O(h8@SN1mm"z if(!($insert)) {
#j]+YLj5_
H#O print "Useronline Insert Failed > ";
qSNzE V~tN }pyb*rd [h
//delete the peoples which haven't been online/active in the last $timeoutseconds seconds.
u"i&g%R/x]py2X $delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout"); LQ MBra
if(!($delete)) {
n:Eo vy(j:M print "Useronline Delete Failed > ";M.wu3K7m8I'H;[
}
L#T\2Y2eE [ F //select the amount of people online, all uniques, which are online on THIS page
\-k1NX] y $result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");
H"Z0[ K z1Rm%S if(!($result)) {
h0IU#O+B!D3D8N print "Useronline Select Error > ";8k0^ Zb/H%jZ
}
~GF1~6a //Count the number of rows = the number of people onlinef%O\ruu(m`%_
$user = mysql_num_rows($result);wSQ:m%p3`
b6D
//spit out the results
wmq0p?(R1k]2i){7A9i mysql_close();
j4Q~7xZ+e_lD if($user == 1) {5H;Z2c)f$j9uRA y
print("1 user online\n");
,a"~0D#g t } else {
hJ ^,|&X;z"{ print("$user users online\n");
kq1HA!s1},g(s }
3wk1RBl.u4Z5B ?>8E)I-a thH
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M)bd-F 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。k0VT'a2Y*X
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。7iZ sUTz;KJ
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。,A%P7w)o*_4n^
当然啦，这两款主机也是相当不错的。
X8Z%h j&r;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k:Y1s#`W-@1O
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 z.r2hK
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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]
\Kw5[cT 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]
4E w-{}AKrM 自己加QQ去问吧。

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