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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！
T @ G$I)@` {+|yp 我是用PHP+MYSQL来写的，原理：网站在线人数的程序代码+后台有MYSQL数据库支持，可以直接统计出网站当前的在线人数。
Qka,@j.H3[ 首先我创建MYSQL数据库表。
*Ny0[0aj
xb9] CREATE TABLE tablename (SuN6YJ"a Z%eza/p
field type(max_length) DEFAULT 'default_value' (NOT) NULL UA\pV$c
}可以使用的SQL语句。4O"pe1_d_+p(m.\
CREATE TABLE useronline (
:OUZy%Y timestamp int(15) DEFAULT '0' NOT NULL,Uo|o _*H5Lst
ip varchar(40) NOT NULL,0F
gJF5[YD^;r
N
file varchar(100) NOT NULL,
j T5X'W%p.v4UMA-zB PRIMARY KEY (timestamp),|_%f)_ f_ Y.T
KEY ip (ip),
QR&q z4azr KEY file (file)'\SB+xrt-KE3`X
);下面我们是PHP脚本，首先我定义MYSQL的信息。
,|4{:Q5j5H $server = "localhost"; //你的服务器2S8bZ0j|wU(M
$db_user = "root"; //你的mysql的用户名
/}9gPwC*j X
g $db_pass = "password"; //你的mysql的密码w1`Zi,]p
$database = "users"; //表的名字设置统计的时间(多少秒内在线人数)
V[~Oy.K6kM $timeoutseconds = 300;取当前时间。
? V!wYn?^ $timestamp = time();上面的完整代码：
p3e)R~,} <?php
Z9fYA#g+] $server = "localhost"; //your serverY"K }uxa
$db_user = "root"; //your mysql database usernameC*C}%i+_*X)]
$db_pass = "password"; //your mysql database password if any#l2W GoQ)]o U,q
$database = "users"; //the db name
6dO|,F
}N $timeoutseconds = 300;//timeoutseconds limit
Ht}TA'm*VWbT*} J //get the current time
T:U5[3X:G(U4A;} $timestamp = time();
3Q"H$_'y].Si //calculate the lowest timestamp allowed
r8{cx.VZ q
y`P $timeout = $timestamp-$timeoutseconds;GZ_ p(f[
?>连接mysqlK7}G/hHb?na;w
mysql_connect('localhost', 'username', 'password');也允许使用变量形式。
L_/D)m)c!q mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接
p.{6U8x_y*c
\UI mysql_connect($server, $db_user);查询数据库的代码：%}@|K5rE.r%Z/s
mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。
7o:l4S*f/~G\ $insert = mysql_db_query($database, "INSERT INTO useronline VALUES
'z@;i(Oi,^!i$VC ('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
!RK$mPy5Uq 如果用户用错误信息的话，这样处理。
YV`i I;[ t0[ if(!($insert)) {
)d/drargeu print "Useronline Insert Failed > ";
Gc wd G4zit1` M }然后实现当超过设置的时间就删除该用户记录。*PC@HH4_%?fH4b
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。
&ND+V%w'H*n DU/^&xG if(!($delete)) {,{P u!kL$P/WRC@
print "Useronline Delete Failed > ";
d)v7C+e!N)V:Z }下面我们解决数据库中不同IP的问题
8Sqm"Im-G $result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用 eG%ES8{ ]x
mysql_num_rows(query);来统计用户，代码如下。
K [AXpvf $user = mysql_num_rows($result);最后关闭数据库。H-aV!^2O'a}c7?$B
mysql_close();显示在线的人数。
8e0b3xAN#@ if($user == 1) {
Y/N~j-ld'By'O print("1 user online\n");+q-h{k.ld4P
} else {XXk6DC2pdg;A4\
print("$user users online\n");
}fYt(?e }最终把上面代码写成一个PHP文件如下。
*z+O C
u+[8hrJ <?php
/yf9K*T*_%p^&J //Put your basic server info here]E,qh)K?^,Lz/j mS{A
$server = "localhost"; //normally localhost
5K5Lp+W0pi'^wvJ{ $db_user = "root"; //your MySQL database username5H|.qgHuX.pQ]Z
$db_pass = "password"; //your MySQL database password
1W8zK }N3_ $database = "users";s*~@ aT[6z
$timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably are
%S"egC
S_{!u // offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last
f9G8};H']*~/q.E*R| // $timeoutseconds seconds)B(\'Q:t*kU
//this is where PHP gets the time
o5o*S'O@)zO1K,a $timestamp = time();
,Wy;JN{hJ!t //counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed9AxNYiE&OK7w5PWJ
$timeout = $timestamp-$timeoutseconds;Ok-Y-lh
//connect to databasegU+y-~A
k.Sm}
mysql_connect($server, $db_user); U,G&K(?%t%j;Qr
//add the timestamp from the user to the online list%m*g6`/|3[3w*{z
$insert = mysql_db_query($database, "INSERT INTO useronline VALUESf
i"fQ[(AB*}
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
&I$Y}(zE!H X5c"g;k if(!($insert)) {1Yz*O}6^
print "Useronline Insert Failed > ";
X#A?rBL{eY_(d }
7c.I:D_%P5SO //delete the peoples which haven't been online/active in the last $timeoutseconds seconds.
,H8aN*T,H:I9Iubv $delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");
$cX
`d'Q9Oe
_T if(!($delete)) {
8\,KNan!m @s7`,`B%~ print "Useronline Delete Failed > ";S]#qABYas/o$F
}
!@1},CZ
{ UI //select the amount of people online, all uniques, which are online on THIS page
r4E_ v4`e $result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");)@8J6b.kD
if(!($result)) {I#x4Dhq:]Z#YH
print "Useronline Select Error > ";R%g;\^!u5s)S
}9~ SE
\yM0^O Tw
//Count the number of rows = the number of people onlinep4BF
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$user = mysql_num_rows($result);
E$x#fS/w!l4r //spit out the resultsT"J0kao"N
mysql_close();
Ad![7y/S/|T if($user == 1) {6Xvwxq0w(vD2i
print("1 user online\n");
$ep|^!zp } else {F5i!@`U-h9@(h
print("$user users online\n");
LvX4D@B
m }G+R:` m2S/M M(zG
?>
9l(j{Ehp`E"U@ W [url=http://www.now.cn/vhost/][img]http://b.todayisp.com/bbs/760x90h.gif[/img][/url]*A1[,{VJ(L{
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。
,ES#@u{9{'r7c 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。Lq5ln&v{
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。
*XZdLl4m"\4sF6h 当然啦，这两款主机也是相当不错的。
6W(qwz-o/~9@"[&vK 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
!rl!E{"m7h6[HEk 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
2m.^9AwN6b} 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]
&W V|nI&l8| 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]
:tts$ryS6b 自己加QQ去问吧。

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