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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！h@.R2st!CL(A
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。.g["kG b6mG!rp+iD
首先我创建MYSQL数据库表。/DhEZ lTi6VTG6O
CREATE TABLE tablename (m:T,?p:per^3J
field type(max_length) DEFAULT 'default_value' (NOT) NULL
p2KUwF1E(o }可以使用的SQL语句。
d/Kwg5k CREATE TABLE useronline (
]
rr*teT7J2C timestamp int(15) DEFAULT '0' NOT NULL,
!t%~/D4Wb ip varchar(40) NOT NULL,
@&[,^%q'LN\\ file varchar(100) NOT NULL,?&YE ei
PRIMARY KEY (timestamp),
jn6X0B:Rlt'l0Z'I KEY ip (ip),
)k'\2v2F-zR(Q_ KEY file (file)
P J.]A^a&A );下面我们是PHP脚本，首先我定义MYSQL的信息。
S2cN+KlZM $server = "localhost"; //你的服务器z._fXp4{w
$db_user = "root"; //你的mysql的用户名g0we"CN.m&x
$db_pass = "password"; //你的mysql的密码
0ek@$d-L:RQ`~v $database = "users"; //表的名字设置统计的时间(多少秒内在线人数)^*P[!X_ SN1?&S4L
$timeoutseconds = 300;取当前时间。qX6~s+BA~
$timestamp = time();上面的完整代码：^R9M6RE7N,F
<?php
_'iB7h` $server = "localhost"; //your server6g$\sDt4_)N9l_
$db_user = "root"; //your mysql database username
:z8j3C.c_`}%N%b $db_pass = "password"; //your mysql database password if anyv2Cy-|4pr
$database = "users"; //the db name4R_ C$Zu2L*E*n9O
$timeoutseconds = 300;//timeoutseconds limit
a/?*bv]luqP~ //get the current time
+N@[g^3@r%A $timestamp = time();
o0~L
ur-v~"cn //calculate the lowest timestamp allowed#pl5I3Zr:x
$timeout = $timestamp-$timeoutseconds;
|E3Dq+D ?>连接mysql
:j$a` |u mysql_connect('localhost', 'username', 'password');也允许使用变量形式。
G0}b|m5ScD mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接
jp5S#^s7Q Z)E7xo mysql_connect($server, $db_user);查询数据库的代码：
C9f7DD-{D*w mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。+Ul'Yc5o6e Q*N
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES
M Of-I@*LK5r0A ('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");dml+u/FX:N
如果用户用错误信息的话，这样处理。
!xme-BO~_/\4Z if(!($insert)) {
"o`"VWDv print "Useronline Insert Failed > ";-CrTI&Z.N!Gp
}然后实现当超过设置的时间就删除该用户记录。
[U b2y\8MQ $delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。
nz9]$c vF if(!($delete)) {
$M5q'f4d3p F)o print "Useronline Delete Failed > ";
#m`:^@t%~b }下面我们解决数据库中不同IP的问题
u }-M(S,S(R"{.[boT $result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用
kg]%UK [$tW mysql_num_rows(query);来统计用户，代码如下。 GlDJ A8^
$user = mysql_num_rows($result);最后关闭数据库。5Og1yzX#u
mysql_close();显示在线的人数。do7q;NjZ]$ks
if($user == 1) {
M&w%y_8c print("1 user online\n");
_5KQ,G#]7I {4j{ } else {:?ex.o6DPv
print("$user users online\n");-p-[
yw%j0u,iHg+_
}最终把上面代码写成一个PHP文件如下。C7RLfIXg0?;t
<?php
2cF,M$AB;Sk //Put your basic server info here(n2J"BM5L[D5Mv
$server = "localhost"; //normally localhost~5f$Dr9|g;`w3S"u$B
$db_user = "root"; //your MySQL database username/]3uQV}
$db_pass = "password"; //your MySQL database password
t9MAZ7z} $database = "users";
$BLT;|BR5G $timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably areF oh"[%H.j
// offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last
P9CV"HE/el*l*[W-~ // $timeoutseconds seconds)
3APVUCzO //this is where PHP gets the time2jLLH(Rl0N?
$timestamp = time();
)Mo?T&QN
K8o //counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed
_"Wf2xTvQ $timeout = $timestamp-$timeoutseconds;Xyx-I }*k1w
O
//connect to database)X2lh2PU)Hq
mysql_connect($server, $db_user);
;@`&T"Z4rm //add the timestamp from the user to the online list
,t~tJ.i It k
M
FD/j $insert = mysql_db_query($database, "INSERT INTO useronline VALUES
Gs^6n J0V0u/wl ('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
t$G)_f.v&w+P if(!($insert)) {KZ)PR![x w8V,h/`$c
print "Useronline Insert Failed > ";$H4xvi9Die2F
}
_+[q._:VJ
o //delete the peoples which haven't been online/active in the last $timeoutseconds seconds.
6A-[:g%I0j}#gf $delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");s9I l|.ugI8M&t1T? q:[
if(!($delete)) {
le'Iq,q print "Useronline Delete Failed > ";
%yn L/If y+qs }#m!?#g4H!{e
//select the amount of people online, all uniques, which are online on THIS pageq9[#T#^:J L1q({{
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");%A0U2k9s+p j)n
if(!($result)) {
(y
g3DV*w5Us print "Useronline Select Error > ";
\;D}7iQv%wMj%k{ }
R H?q1c i:DY //Count the number of rows = the number of people online
tc'a9@&m&O!D5D $user = mysql_num_rows($result);(F*IKr6p:W#M
//spit out the results
Hj+_*uo2e!xnf!j mysql_close();
T'W[P0G2iXX if($user == 1) {
B@\a&O R&S\ print("1 user online\n");
0]!hk?(Yty } else {:S`sq4|/O(p
Tm${
print("$user users online\n");
|(lA+OXd+U%ux }:vZ2nl,C\ qGN
?>
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;[rvjN!JW&T 以上代码我是在时代互联提供的免费试用主机上测试的，感觉效果还不错，性能很稳定，不信的话你也可以去试试。当然，记得指出我这个程序中的不足先哦。
?7c(Z6w P/fi 时代互联是行业内最早开始提供PHP 虚拟主机的公司之一，现在已经是的金牌域名注册商和中国互联网客户满意度十佳单位，产品功能已经非常完善 ，特别提一下几个特有用的功能：数据库自动备份、免费集成繁简通简装版、多域名绑定、多子网站支持、GCDN 网站加速器、镜像加速、高级访问统计系统、支持WAP、可选电信/网通/香港机房。
Z&bI(VP'U 我之前建站的时候选的是他们公司标准商务E型，因为这款机型还特别支持ASP.NET3.5(3.0/2.0/1.1)/ASP。
*V6FOk~H.w 当然啦，这两款主机也是相当不错的。'XB9z'Gc:nJD-\l
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标准商务B型：Unix /Linux 操作系统+独立网页空间500MB+送800MB邮局空间+60MB MySQL数据库空间=1365元/年$Qn8E(K|A
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