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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！
!P)[.K2@Y7ED'k 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。)_ [
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首先我创建MYSQL数据库表。
R;qR[7A$] CREATE TABLE tablename (
1dE4[ I\$X field type(max_length) DEFAULT 'default_value' (NOT) NULLw ZZ4PI3p
}可以使用的SQL语句。
vB%h#^;x#r CREATE TABLE useronline (
'gpy\~3m,Z timestamp int(15) DEFAULT '0' NOT NULL,
n ob0Kr Z r6dR ip varchar(40) NOT NULL,"_!_5a4_PgK
file varchar(100) NOT NULL,)A1sEFh a
PRIMARY KEY (timestamp),6F8X3MY)`7`
KEY ip (ip),[6{/O-J(^C}
KEY file (file)Q-y#a:f Uj"VZt/Y
);下面我们是PHP脚本，首先我定义MYSQL的信息。
a,j?l@K\ t T(Pq $server = "localhost"; //你的服务器
XPF*M$i $db_user = "root"; //你的mysql的用户名
#OB@4T1Zn^;t9e R $db_pass = "password"; //你的mysql的密码Y7DAlV
$database = "users"; //表的名字设置统计的时间(多少秒内在线人数)| ]h}xFU9A1R
$timeoutseconds = 300;取当前时间。j(H Hz
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$timestamp = time();上面的完整代码：
!q1?'x6^m,^!m ^6v <?php?U grRmcnh
$server = "localhost"; //your serveroKm(v w r p
$db_user = "root"; //your mysql database username
%mT:a;ke*_"rE9` $db_pass = "password"; //your mysql database password if any|%Ru1T o1u.\
$database = "users"; //the db name7[mjsy%R:p
$timeoutseconds = 300;//timeoutseconds limit
dxlf]8e //get the current timeH },s:z0]W
$timestamp = time();!r[CQu^
//calculate the lowest timestamp allowed
e)b7e2h+j1@ $timeout = $timestamp-$timeoutseconds;
Fr0Y w,w-~9OG$X^ ?>连接mysql[l;kGCzZ
mysql_connect('localhost', 'username', 'password');也允许使用变量形式。
:c
[c?!q
s mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接
F6A{%U!v mysql_connect($server, $db_user);查询数据库的代码： RJZ*RV?O
mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。
;b;_NP9C2xg#M+K $insert = mysql_db_query($database, "INSERT INTO useronline VALUESy)bM4{Iyy
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");-I x\@z
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如果用户用错误信息的话，这样处理。
yh1PUz if(!($insert)) {
TRp x(i6nn+a'o [4x
print "Useronline Insert Failed > ";D lS:[1b
}然后实现当超过设置的时间就删除该用户记录。
!^mVC6Zj $delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。M!Fp8xm+Q/|F
if(!($delete)) {
$A o[hBPo print "Useronline Delete Failed > "; e8ugC4M.r9}k:z,s
}下面我们解决数据库中不同IP的问题/W.nw0O'a:z}xV
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$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用
/S4cx5kxQ"IS mysql_num_rows(query);来统计用户，代码如下。
R zyI'i ` $user = mysql_num_rows($result);最后关闭数据库。
.d7y},|w!amz mysql_close();显示在线的人数。$Z4}g%Qh/p
if($user == 1) {
B:dE?n!zr0A print("1 user online\n");
^ T Ydy4fS
} else {oO{ Dg6zL#Y(NN
print("$user users online\n");
/^{DIOV }最终把上面代码写成一个PHP文件如下。
'lZ(ymF3BO#j0h*^ <?php1^3Kxm'Q(B
//Put your basic server info herek(~s'AR!P
$server = "localhost"; //normally localhost

e_'l!O,Dn6H $db_user = "root"; //your MySQL database usernameS1daCi
|,m
$db_pass = "password"; //your MySQL database password
*ZM|)h8^ $database = "users";
d6Eo_u,Ew|r1s:v $timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably are
cCc/cbl // offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last
8\ Fi'q
y"{d&Us // $timeoutseconds seconds)
gJ
| }%K u^GD //this is where PHP gets the time
x5T'}qs4N+_ $timestamp = time();
zJD*k3}EL&vU //counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed
]|\ y4A7A:X2? $timeout = $timestamp-$timeoutseconds;V5A L] }#wM
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//connect to database
?&Q lV!c&T5_0?R mysql_connect($server, $db_user);
9_E5Cy6E]['O ] \ //add the timestamp from the user to the online listR AYV^ g:J
$insert = mysql_db_query($database, "INSERT INTO useronline VALUESM
|Z$fl8PV\
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");1G5@/_2o| q(x9TyN;S
if(!($insert)) {
fU9uEAL+k print "Useronline Insert Failed > ";
m*i^5^m }"DM_G jQ z
sk~)_
//delete the peoples which haven't been online/active in the last $timeoutseconds seconds. Y(O |8vj;c%q
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");
:A`n`s,wX%| if(!($delete)) {
2X^y$D1hX*[8B{ print "Useronline Delete Failed > ";&L1l)@"Qq5S)_Y
}
5cI$y*i _p-p[ //select the amount of people online, all uniques, which are online on THIS page)F q?,m-oBH
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");
Lno*BJ$P if(!($result)) {
w9^ e?tdvC print "Useronline Select Error > ";~1zYtqk?/_
}hw
kE"kl$X]L r
//Count the number of rows = the number of people online
i(k.wi L{;I $user = mysql_num_rows($result);L.^;|'eM-F
//spit out the results+Am
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mysql_close();
8A8S%`b*p$tAwz V if($user == 1) { ^8O,ovh.F.i5Is
print("1 user online\n");5O9I ` T3c
} else {J(FoNA#Q`T
print("$user users online\n");
P*Z:QRGG;i }
v'L/q k5xJ*gY j7v4_ ?>V exo]B/Xu
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X C~oQ 以上代码我是在时代互联提供的免费试用主机上测试的，感觉效果还不错，性能很稳定，不信的话你也可以去试试。当然，记得指出我这个程序中的不足先哦。
]?Ztp1T7n 时代互联是行业内最早开始提供PHP 虚拟主机的公司之一，现在已经是的金牌域名注册商和中国互联网客户满意度十佳单位，产品功能已经非常完善 ，特别提一下几个特有用的功能：数据库自动备份、免费集成繁简通简装版、多域名绑定、多子网站支持、GCDN 网站加速器、镜像加速、高级访问统计系统、支持WAP、可选电信/网通/香港机房。!tT9l!a-T"k
我之前建站的时候选的是他们公司标准商务E型，因为这款机型还特别支持ASP.NET3.5(3.0/2.0/1.1)/ASP。$woL&F,j,h9OIo%`
当然啦，这两款主机也是相当不错的。
4U`'@zQa*Sx 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`9e$lU_`W 标准商务B型：Unix /Linux 操作系统+独立网页空间500MB+送800MB邮局空间+60MB MySQL数据库空间=1365元/年#^^ ECQ3VDZ/q$`
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