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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！tz
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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。r2P5fm,E~k2s4k
首先我创建MYSQL数据库表。
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@2Z CREATE TABLE tablename ( N3}-WL+sQ W_*yB
field type(max_length) DEFAULT 'default_value' (NOT) NULL
W_im8p9` }可以使用的SQL语句。-vG"A@_R
CREATE TABLE useronline (DZ/x o%acy[
timestamp int(15) DEFAULT '0' NOT NULL,
2[_p9cT y ip varchar(40) NOT NULL,d5PU;fi"V:j2e
file varchar(100) NOT NULL,
bcnCB@x1M PRIMARY KEY (timestamp),5c~'be2k
KEY ip (ip),
%UI NzxM"Z KEY file (file)
daV+hs$H"C );下面我们是PHP脚本，首先我定义MYSQL的信息。3u^ M"Jq x.S_%Fu"M
$server = "localhost"; //你的服务器 efV!n.N}#ZZSd
$db_user = "root"; //你的mysql的用户名
v0In"qVr IS $db_pass = "password"; //你的mysql的密码
|*C#coDs-s $database = "users"; //表的名字设置统计的时间(多少秒内在线人数)W-H/j0y:b1oHB h J
$timeoutseconds = 300;取当前时间。
:a(~9~'O6}r $timestamp = time();上面的完整代码： B g$uM1JB-_~P
<?php+leE0?G3F$r0O
$server = "localhost"; //your server)d+aweI'w-r2N
$db_user = "root"; //your mysql database username
4I
l0h8jd $db_pass = "password"; //your mysql database password if any_{1Y0D3K:C3`R
$database = "users"; //the db name
4TO"x%[%?ns $timeoutseconds = 300;//timeoutseconds limit
5g5re#?{s*h5I //get the current time4i gA G g
$timestamp = time();Gbn Y/?i9PJ
//calculate the lowest timestamp allowedH;h@HHwI
$timeout = $timestamp-$timeoutseconds;
5uMixTRk4Yw/Wpc5] ?>连接mysql ut1m zU9K5Ka \
mysql_connect('localhost', 'username', 'password');也允许使用变量形式。
DG,G o7K7C mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接6u$J-GMh
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mysql_connect($server, $db_user);查询数据库的代码：
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x1{4U mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。!m4F q;isG*|(a
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES
0^^0QY Qi^i y ('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");`F#@
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如果用户用错误信息的话，这样处理。
-JJFz }1`+^&l1N if(!($insert)) {
Bd.@F3xb print "Useronline Insert Failed > ";2CbAH-B:\I;[
}然后实现当超过设置的时间就删除该用户记录。CK2]
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$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。
sMg{z0Oi;Z-T%Z if(!($delete)) {
HZ}m6e1H}Y/xN p)m
print "Useronline Delete Failed > ";
_3ZZ"y'H9C8CD3t }下面我们解决数据库中不同IP的问题
r&J#|$S u u $result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用 Gv\Q
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mysql_num_rows(query);来统计用户，代码如下。%bgh5NQ|
$user = mysql_num_rows($result);最后关闭数据库。d#XE"k
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mysql_close();显示在线的人数。
5d$[ Kh0`4Af if($user == 1) {
B\_0p)Ly3?*oS print("1 user online\n");T2xQ-_mfyTE9E
} else {
:G/WYK!Ga7r print("$user users online\n");"Hlsip-^I
}最终把上面代码写成一个PHP文件如下。V#j
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<?php
F.Nw:h?1hBI2]o //Put your basic server info hereM7AXq`
$server = "localhost"; //normally localhostyYia&j2v b
$db_user = "root"; //your MySQL database username(R
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$db_pass = "password"; //your MySQL database passwordyx Ul/n2Z
$database = "users";c-}TO-[
$timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably are
A"F K S;?+A // offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last
%n&I@{E // $timeoutseconds seconds)^7@'Q#i].w1?q1^
//this is where PHP gets the time
5p;H"W0X @@^%c $timestamp = time();SYb4~}3~9G,WJj2P
//counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed
0T%Vf.x8u4X!g $timeout = $timestamp-$timeoutseconds;
D@wGR"]
R //connect to database6E;pKryC;s
mysql_connect($server, $db_user);
!hf,Z0co //add the timestamp from the user to the online list
Kaj^SO.z v"u $insert = mysql_db_query($database, "INSERT INTO useronline VALUESR S&j2zx
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('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");#v
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if(!($insert)) {9|-Pfaoj
print "Useronline Insert Failed > ";Qjz:A5NV+EZ
}w(Y:[2Q {,X7I
//delete the peoples which haven't been online/active in the last $timeoutseconds seconds.z!pX.X Mg
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");*Y&|H F@
if(!($delete)) {
2q:X(lt x%t/m print "Useronline Delete Failed > ";
jf.I#K1B2A
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G/t][qE //select the amount of people online, all uniques, which are online on THIS page
9J(X@[Lus $result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");
s#KG(?-M:g O if(!($result)) {V$?)DoQt*I#\]"o
print "Useronline Select Error > ";s v2h[1z8nSJS4_
}Pe']1WOamQ1F
//Count the number of rows = the number of people online
~;Habx#b $user = mysql_num_rows($result);B#?$|c.t,A
OvZ9qU"qd
//spit out the resultsLq
}8f0rlU
mysql_close();
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if($user == 1) {
D;dDqW(R print("1 user online\n");-S j|;x P.Ssqt
} else {@|{ t7V
print("$user users online\n");
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[url=http://www.now.cn/vhost/][img]http://b.todayisp.com/bbs/760x90h.gif[/img][/url]
d!tOD%` 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。
m9_?(C6T'bum4g6VC 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。
iVD/Z\2XWG.bF 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。9p1]c,y.P-tYRb
当然啦，这两款主机也是相当不错的。(^Tj3[j2]
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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
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^ 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
wg8AD'J J1b 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]
^])AUEK 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]
0L@-[ ?@'_n 自己加QQ去问吧。

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