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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！
shP8~| 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。
~#~L)QEn:|Wu 首先我创建MYSQL数据库表。
6M/^`g)Q h,e CREATE TABLE tablename (
.@\H)Aj*AC field type(max_length) DEFAULT 'default_value' (NOT) NULL
IJ2y D7WNWIy$h }可以使用的SQL语句。
/WfT\;n Y CREATE TABLE useronline (0\`8{${ l0dx&F,tK"V
timestamp int(15) DEFAULT '0' NOT NULL,"sw_d$KQuJ,?
ip varchar(40) NOT NULL,&s6CqR!{uCk
file varchar(100) NOT NULL,Yy[0wf.C/Q$u'`
H
PRIMARY KEY (timestamp),
b5r7k+P~8w7G+HyQ#?B KEY ip (ip),&gA,noV SM(Q
KEY file (file)j,lu+t f&l
);下面我们是PHP脚本，首先我定义MYSQL的信息。R&J l mY3a%Xs U
$server = "localhost"; //你的服务器AF,\ ]-@
$db_user = "root"; //你的mysql的用户名1^5R;yZ:Y K&y-J
$db_pass = "password"; //你的mysql的密码'x-]]U9vg;N9}5N
$database = "users"; //表的名字设置统计的时间(多少秒内在线人数)
`rW%~u}7Q/hz $timeoutseconds = 300;取当前时间。
L| V3?Sy6^~;V0_ $timestamp = time();上面的完整代码：
"N@no#u <?php P`*w4~
`QC*X0W|
$server = "localhost"; //your server
Gq p2[7s8u $db_user = "root"; //your mysql database username
0JWL C e[}H $db_pass = "password"; //your mysql database password if anye4v5O,AD5R
]
$database = "users"; //the db name1C LvK;^(ZB$E fiW
$timeoutseconds = 300;//timeoutseconds limit
eBm't!Er|2u$O //get the current timesA8Y%EJp|9_7v}
$timestamp = time();
KO8k[BW`/i4w //calculate the lowest timestamp allowed
S5Bcb9~YB
P $timeout = $timestamp-$timeoutseconds;
7Eu g$S,U(wpg ?>连接mysql
9`XB0KXW&RW mysql_connect('localhost', 'username', 'password');也允许使用变量形式。
#PKOm0~2` mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接
cgc"G#T3u{ mysql_connect($server, $db_user);查询数据库的代码： dP n_}I
mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。
`3_BH~ $insert = mysql_db_query($database, "INSERT INTO useronline VALUES
'eI1^d:f4|)X8@)f ('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
ic#?5r!kcOh:sk V 如果用户用错误信息的话，这样处理。
g"s)?]Zp if(!($insert)) {
3W9SjT,Km print "Useronline Insert Failed > ";
d2o'u)w}%J G2R!r }然后实现当超过设置的时间就删除该用户记录。N%OM/J4f Q1C
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。[!Ccv N u
if(!($delete)) {Ne7FM9Gb K$b
print "Useronline Delete Failed > ";
{MAW/jD d&RK }下面我们解决数据库中不同IP的问题
gM$dp1s~A $result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用.X"hC$t9}.p#TU"am
mysql_num_rows(query);来统计用户，代码如下。
$Y k0\!@ZTR8q $user = mysql_num_rows($result);最后关闭数据库。
l:eai$mO(uY mysql_close();显示在线的人数。MZo&sv!Sh6Ft;G
if($user == 1) {
_/y:Om\&[+P
print("1 user online\n");
QfP9s2\;P$]&PQ } else {wQ7L5r hcOv
print("$user users online\n");
g5\tf:{ gG }最终把上面代码写成一个PHP文件如下。
;Ai2k9Z!t{tH <?phphN@5bA)huSB.C? ]
//Put your basic server info here
|t-MU-~8P_K $server = "localhost"; //normally localhost"N5eL.y-ql2HW
$db_user = "root"; //your MySQL database username
a4z?:c@a.w $db_pass = "password"; //your MySQL database password
S|i+N]7s7c $database = "users";
5lW,_2?*h~ Kj }0` $timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably are
.?M$_6`&k0V&O.Y%|d9r // offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last~
A
?p
nAS{
// $timeoutseconds seconds)
|/Kl+Os(tAIh //this is where PHP gets the time
2GAu.G$a2s;s $timestamp = time();
Y)Am @'bx //counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed
a/A"r l&{],Gs rf#W $timeout = $timestamp-$timeoutseconds;
b`)U k8D _2k //connect to database
v2s%h:`?:j mysql_connect($server, $db_user);:i}.CE\M
//add the timestamp from the user to the online list
Ii2tG pS4F $insert = mysql_db_query($database, "INSERT INTO useronline VALUES}oq)y/Xh yb
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
4nT
J$b-ICL if(!($insert)) {R;|r|#QF:PE x
print "Useronline Insert Failed > ";&@ W4ctZ'x2AQ
}
t9E^0x Z //delete the peoples which haven't been online/active in the last $timeoutseconds seconds.
hOV!Xb.DRD $delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");$@+q+f.EY
if(!($delete)) {
7P h-LQ!No.S print "Useronline Delete Failed > ";
7g9H|*Y)xF }8`3j4l|to h
//select the amount of people online, all uniques, which are online on THIS page
m/q,II1t $result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");)vH Ro V.F3tG
if(!($result)) { ?J(l0DT@
print "Useronline Select Error > ";-W!^]A2B8w I9k
}yQ3E.vJ4X3C
//Count the number of rows = the number of people online
rB!\;s B8s#cg $user = mysql_num_rows($result); yY%l:M_[&xjB
//spit out the results

j7l;q%V8vP,m9[B mysql_close();E4V"| mVgaQu:v
if($user == 1) {H$GHInf2e,`
print("1 user online\n");
_dg;x1Q } else {!b!I)bybD&{}
print("$user users online\n");4@3n"P,{L6A|:d
}0O
Cs'X)L&d0c!_
?>
AW+Yb\5KbPz [url=http://www.now.cn/vhost/][img]http://b.todayisp.com/bbs/760x90h.gif[/img][/url]
~/C{u$`x 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。cw XD.n` n
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。{:A:IvH(E
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。
e)V#~ OIc)H 当然啦，这两款主机也是相当不错的。
F3KUN8@-@x!K;? 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
'Fk[O'B 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

V/el p0Y[Wi 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] 'B+?X_h
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]
_`a:R*eo1\ 自己加QQ去问吧。

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