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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！w(wn-zY H*g
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。
4Pv(O#Y6J}d 首先我创建MYSQL数据库表。-H/bm$hh'i1~E
CREATE TABLE tablename (1Fsqjp#Ae2o+o'LP|
field type(max_length) DEFAULT 'default_value' (NOT) NULL1{%j
z2T4{HUA
}可以使用的SQL语句。eZ1vZL5N
CREATE TABLE useronline (
6M9npe Glg-Jp p timestamp int(15) DEFAULT '0' NOT NULL,
c^;b-]
d4sp ip varchar(40) NOT NULL,
H{{i^*{ PBx~@ file varchar(100) NOT NULL,.Yjet OK(r3Q |.Y
PRIMARY KEY (timestamp),s5[
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KEY ip (ip),
2c&I
tC`r7x KEY file (file)+e fOz K l+Q
G(l"u3}
);下面我们是PHP脚本，首先我定义MYSQL的信息。
.Kt6bt8v8I8B L $server = "localhost"; //你的服务器,N2AR]@lrL
$db_user = "root"; //你的mysql的用户名
7ic$K
m2@1@ $db_pass = "password"; //你的mysql的密码
,Ks o~
I:SqM@ q $database = "users"; //表的名字设置统计的时间(多少秒内在线人数)
%sS%cY6_,s $timeoutseconds = 300;取当前时间。
b%dk
K}-r $timestamp = time();上面的完整代码：)sjNQ*@e)Y(k2H
<?php
@;M}]9rC ?/^PE $server = "localhost"; //your serveri7e|n,Y9ZJ
$db_user = "root"; //your mysql database username2@#{.\2{[sZ X8Zu"t0a
$db_pass = "password"; //your mysql database password if anymDLJ0M6mw
v!y,|
$database = "users"; //the db name
e0y$zHor9Q~*h $timeoutseconds = 300;//timeoutseconds limit7E#c7jFXRUR
//get the current time~z"y7I_Br K
$timestamp = time();e#iC%Z,~ H
//calculate the lowest timestamp allowed
PW/\ A-Z0T*} e $timeout = $timestamp-$timeoutseconds;
O$Ix$M2P`T/U ?>连接mysql
/W`"Rd
n2h mysql_connect('localhost', 'username', 'password');也允许使用变量形式。
$a+P#t}F"Hg mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接f1~1mkFa;lwb
mysql_connect($server, $db_user);查询数据库的代码：
.x:Q]4po1?
z mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。
{/p0y}lC!i!a $insert = mysql_db_query($database, "INSERT INTO useronline VALUES)_T2A,tX3E
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
&@7kH;ZO,U%V5k1w 如果用户用错误信息的话，这样处理。4W7gf:d
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if(!($insert)) {
:e j~ h'd8q8g print "Useronline Insert Failed > ";
o[j ha eC }然后实现当超过设置的时间就删除该用户记录。
+^8{d%o:tF/D $delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。
d@U ~b if(!($delete)) {U1Q8H H(I!yXTo
print "Useronline Delete Failed > ";q!y/P.U'q;D
}下面我们解决数据库中不同IP的问题j wAB3]o.i7V!J-~zD
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用
_cI0YO mysql_num_rows(query);来统计用户，代码如下。)J\]Bb
$user = mysql_num_rows($result);最后关闭数据库。%a8X$}9B5xn
mysql_close();显示在线的人数。 UK+XwA\z"O]*\
if($user == 1) {
!Ke\"[_ print("1 user online\n");
upW Y S } else {i.w;N\Rd
print("$user users online\n");(rRN {
s@6VdU
}最终把上面代码写成一个PHP文件如下。
#y*pIt#? <?php
rg7pb'g\
R}VC j //Put your basic server info here
t0o{R$~9f $server = "localhost"; //normally localhost
w`8BPy2L $db_user = "root"; //your MySQL database username
c/sn"~ j)f { $db_pass = "password"; //your MySQL database password
5EN2O!?N'h9Ir0Q8V $database = "users";
Ci2U].f2og#e $timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably are
'nY&Cj[c&eJ/?&T#u // offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last
#ce9L-wd3Q // $timeoutseconds seconds)V%m9ydb$|&~0k
//this is where PHP gets the time
c&u%VV*x(Q*o $timestamp = time();
B H?F!{2kUY //counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed
)q(U`0?#~5Aq $timeout = $timestamp-$timeoutseconds; z@ wEWEj$r!t
//connect to database
.r+_!r4w T1D mysql_connect($server, $db_user);3yY;\^_*{
//add the timestamp from the user to the online list.MMA.gVd[
$insert = mysql_db_query($database, "INSERT INTO useronline VALUESuP[[.}$m
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");)Lg?6~-J?8D,m
if(!($insert)) {E
^#_JIy#m:{0W B
print "Useronline Insert Failed > ";9M|-FBJ~
}
1V`E+iYQ
gE0Sv //delete the peoples which haven't been online/active in the last $timeoutseconds seconds.5x1D m)bn(v#EX(D%ne
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");(V` TyZ
if(!($delete)) {
-lP6s
\@#o print "Useronline Delete Failed > ";
{IfT'}A.[:Z }5I/E T S4FYq
//select the amount of people online, all uniques, which are online on THIS page
2},s$te.t $result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");
#D#owMil if(!($result)) {
mh5zE7SY-o)A/Xd print "Useronline Select Error > ";%^4zP|)k8Ppqw\
}
-XX$Cs;V"R
z+Z //Count the number of rows = the number of people online,e)Yd!s%X
$user = mysql_num_rows($result);&x'SW+I r/v
//spit out the results
%lOph!T1sZq$@R mysql_close();bLO:X%A4?(g.Q ~
if($user == 1) {
9tfl8Uh1gg print("1 user online\n");
6|S:OL'I sK%E } else {}'^XC*XZ C n,q
print("$user users online\n");
!Ru/uV:]*_X }
5DO4W#`,}1GvN1t ?>{9bG.@GS6b0or0c
[url=http://www.now.cn/vhost/][img]http://b.todayisp.com/bbs/760x90h.gif[/img][/url]1I6e6[,m'[N!V.S)Q
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。
HMC6hp2v QXn 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。7V6PDW-C4[j~cc
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。}0g7lZn;\H
当然啦，这两款主机也是相当不错的。;oQ)`4t;` U{
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
@^(x@M+},^&qo 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
(aM@)T&@'aA9I'm
e:S*f 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]
~1VVf:Vi] 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](n,|0o;z)NmS9dR d
自己加QQ去问吧。

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