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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！1s/f's)YRn
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。%`R'eE:jT
首先我创建MYSQL数据库表。
C$g"OZ$kZ4C CREATE TABLE tablename (
,A Px%GX&_[&z0C field type(max_length) DEFAULT 'default_value' (NOT) NULLL!xGmT$R]%GAS
}可以使用的SQL语句。sE7t
c6~*K9x!EH#i
CREATE TABLE useronline (
ora4W_ps1S5?Y timestamp int(15) DEFAULT '0' NOT NULL,
"[*g:GnT?3l6a$A ip varchar(40) NOT NULL,
iv3]z!Oqv,? h,]r(X file varchar(100) NOT NULL,
Qyn Z)t?v PRIMARY KEY (timestamp),6DNQ+g7egK;U
KEY ip (ip),I FJ d
s O
KEY file (file)eq]|C&C5m}e
);下面我们是PHP脚本，首先我定义MYSQL的信息。(f{&[{!QWG
$server = "localhost"; //你的服务器Z1O8a*D.cN
$db_user = "root"; //你的mysql的用户名
R {/U5?Xn6od $db_pass = "password"; //你的mysql的密码
L&v'poufS_ Pg $database = "users"; //表的名字设置统计的时间(多少秒内在线人数)
qf+v:W2D~?mB $timeoutseconds = 300;取当前时间。
Rn'_g"?'_J3b4^ $timestamp = time();上面的完整代码：8B9oA1sJb#{X({
<?phpR{ y8s+WH2KQ#]f
$server = "localhost"; //your serverGI[Z;t!M1u
$db_user = "root"; //your mysql database usernameOB/Zh|b/{qyM
$db_pass = "password"; //your mysql database password if any
?5p:ewx(S-\6D $database = "users"; //the db namel+EpxJF
$timeoutseconds = 300;//timeoutseconds limit+f3hi cw R
//get the current time
J6u:Nsw)@d-e $timestamp = time();
7lE#mYc`ns q //calculate the lowest timestamp alloweda Q H+hGr[`5X-c
$timeout = $timestamp-$timeoutseconds;$c h\Oe
?>连接mysql`sA2{ueU%\(X
mysql_connect('localhost', 'username', 'password');也允许使用变量形式。
A&h ]n])R$GN\{YY mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接
j^Z;On+e0B#YS mysql_connect($server, $db_user);查询数据库的代码：7vg
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mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。
^-yG??` $insert = mysql_db_query($database, "INSERT INTO useronline VALUES
}
y8L8T1R1@`.Y ('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");%F A | Bx(w-yK(a
如果用户用错误信息的话，这样处理。
8}JjS:U7\q{ if(!($insert)) {
Q{X9}yDp\ print "Useronline Insert Failed > ";"O%b p g8SE nl
}然后实现当超过设置的时间就删除该用户记录。)e'M!e)AF4j&f1G,|v
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。3Ks4n]#rc
if(!($delete)) {E `:Q ?\9F@z+}c
print "Useronline Delete Failed > ";:g0[#ly"u T
}下面我们解决数据库中不同IP的问题
,z YHI&t(r $result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用
/V1Zx'dweV _ mysql_num_rows(query);来统计用户，代码如下。_N Q*K?Ed
$user = mysql_num_rows($result);最后关闭数据库。A'n+lE s0f{,t&PU
mysql_close();显示在线的人数。
/FB"Bn(?MS$hF8f if($user == 1) {
`K4wgD print("1 user online\n");
U4E9G*] N E S } else {
JE.o7E[ j @+?R print("$user users online\n");7?`,Iy1Fi%m#r&m7l*D
}最终把上面代码写成一个PHP文件如下。
;J})Vr&H <?phpN&g]M Z3eo
//Put your basic server info here
E!y Gv;C)l | $server = "localhost"; //normally localhost
@e3j4S/k ?ma-j%E $db_user = "root"; //your MySQL database username
Gm3S-I L5lN$f $db_pass = "password"; //your MySQL database password
%p0Z t-OCmk $database = "users";
,}-RFz|B|N $timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably are)j'Y1TH0]b7y
// offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last
V0zP6E m W // $timeoutseconds seconds)
;v&Kyj;r //this is where PHP gets the timep/pJ5lx
$timestamp = time();
A0?/n @7m'Z^ //counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed+Qb7By.A,c(bL,GAX{ U
$timeout = $timestamp-$timeoutseconds;
k:V]B0c5| e //connect to database'zBF$H3G*tM
mysql_connect($server, $db_user);
3}#tmpX{d3d //add the timestamp from the user to the online list
IUW5p)J9L $insert = mysql_db_query($database, "INSERT INTO useronline VALUES
] lAD)IbP ('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");4_?,y/TZ d,_/?^
if(!($insert)) {i7A#T6d[F'Oo
print "Useronline Insert Failed > "; Dt*xGN3Wx
}
Bz!Q!Xs //delete the peoples which haven't been online/active in the last $timeoutseconds seconds.
9flo UV $delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");/g1F'RK hY8]f
if(!($delete)) {
wipw6W$] ^ print "Useronline Delete Failed > ";
/yD\-_Pkg }q*\Q/B6UgUo Q
p
//select the amount of people online, all uniques, which are online on THIS page
&~*o.q0{,s,Gqz!d+P $result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");*S$~*A'mc/Q G%i!~)]y\fc
if(!($result)) {
lt%MS}X2}| print "Useronline Select Error > ";@6_
e#o9ut
}
&s,v6SlOz //Count the number of rows = the number of people online7k0Vs st
$user = mysql_num_rows($result);m3OF0o hV&x
//spit out the results
g8W!Y!N4eQgJHE?p mysql_close();f.[!t R}h t
if($user == 1) {3x5BxH)COI
print("1 user online\n");3Hr v5O/tC
} else {
#e3P3r0^l(vCr4_*] print("$user users online\n");G'W'x]\;F}#r
}+v*c h-@9Z f
?>*y e4l-R/jl8y~0n
[url=http://www.now.cn/vhost/][img]http://b.todayisp.com/bbs/760x90h.gif[/img][/url]*G[6xXL$h"GP1|
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。
nhi:C)g(@ 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。D.ua3E,z S_
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。H#U;Z3zcd&`
当然啦，这两款主机也是相当不错的。
#J?Oet(QX@ 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C^ i9b1]
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
"^;{.Qg;cx6`%[yDk%z 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] 4jiG)i\*Wk
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]
8W/S1S2~6yL3m 自己加QQ去问吧。

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