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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！2dD#m5_8`^9Y
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。
"pA5D \4F 首先我创建MYSQL数据库表。
i,gL7v+c_ CREATE TABLE tablename (Ek"l#_ rQ
field type(max_length) DEFAULT 'default_value' (NOT) NULLQ&S(fY&Eb
}可以使用的SQL语句。n
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CREATE TABLE useronline (v+X(L{OO K.S'N
timestamp int(15) DEFAULT '0' NOT NULL,L!n C8c1q"c
ip varchar(40) NOT NULL,
$o*K2Ul+m \U'c file varchar(100) NOT NULL,!~+~S6tI.`t6|
PRIMARY KEY (timestamp),
,`f6c'?O&d Wh"q KEY ip (ip),Q~
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KEY file (file)
"rz ?"U(j$C5q)b#u );下面我们是PHP脚本，首先我定义MYSQL的信息。:GB&m:U%I9v1Q
$server = "localhost"; //你的服务器W^"xd%TEOH&M
$db_user = "root"; //你的mysql的用户名
NHeW` $db_pass = "password"; //你的mysql的密码
{?9X
EA\u4pk+Z $database = "users"; //表的名字设置统计的时间(多少秒内在线人数)3X5M)M$S0e8fc
$timeoutseconds = 300;取当前时间。
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$timestamp = time();上面的完整代码：{:v;`!g4j
<?php%E` R{Lb&A ]3f
$server = "localhost"; //your server
w_J:\Y#| $db_user = "root"; //your mysql database username6T+V]UN TK
$db_pass = "password"; //your mysql database password if any.Scjd]D6f'Q3M~
$database = "users"; //the db name

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g:C~4Uir $timeoutseconds = 300;//timeoutseconds limit
"EMDH(rgS b //get the current time
"E9vDQ5~Y $timestamp = time();
eU*s+JKK //calculate the lowest timestamp allowed
n5V1{!w n,j8^]E a $timeout = $timestamp-$timeoutseconds;y maE ci:\
?>连接mysql
)O4S5k:Uw mysql_connect('localhost', 'username', 'password');也允许使用变量形式。;sL#c:xt S
mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接
'Go7m K/w mysql_connect($server, $db_user);查询数据库的代码：
k*]hVe mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。
,e&]0Od})I $insert = mysql_db_query($database, "INSERT INTO useronline VALUES
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s$`k ('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");h6Nx:g5r8_&n:O
如果用户用错误信息的话，这样处理。'i%oty1j7Q8t
if(!($insert)) {0f5C5e"D
u\
print "Useronline Insert Failed > ";
-GAAvu(Qd }然后实现当超过设置的时间就删除该用户记录。/q2`|T'JL
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。7]L)NxcEVQyC7h!Qf
if(!($delete)) {
U"b'nLT#T print "Useronline Delete Failed > ";(CG+o9q5Z?+Chq
}下面我们解决数据库中不同IP的问题 zB,i"k5D"R$RR
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用
jc$?%F6xFD
e mysql_num_rows(query);来统计用户，代码如下。
E
o(@+eJ,w8}e8S)e $user = mysql_num_rows($result);最后关闭数据库。8I&b^V7O'V%e#A
mysql_close();显示在线的人数。
V2@t3y+e S)p if($user == 1) {B#xE1c$W J9X/ef(r
print("1 user online\n");
A \e4r"BP%Na } else {
Y T BOcGUo Bv print("$user users online\n");
'U0V,E-ZX }最终把上面代码写成一个PHP文件如下。"R2k!tVU0W3Z
<?php$j&h9lF*O)_v`n"?w0v
//Put your basic server info hereo'UR4gf3?)B
$server = "localhost"; //normally localhost
3Z(a3jgO[ $db_user = "root"; //your MySQL database username
J"s _ Muu*IW $db_pass = "password"; //your MySQL database password
q;o/|(k&k
S2Kt` $database = "users";
:Nk2J#EEVb2x"e $timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably are;V,EElff1e2G
// offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last;{GtJp*h;L6B9tuq0[R
// $timeoutseconds seconds)
S-_*\@9Cx //this is where PHP gets the time
8je5Z#DX&P9\ $timestamp = time(); io}n5z'n0n]
//counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removedT\;t@g
$timeout = $timestamp-$timeoutseconds; d-L!A8nU)US!K
//connect to databaseA$rg0h'_6f!G3v)do
mysql_connect($server, $db_user);V*z.k2w H5[
//add the timestamp from the user to the online list6B-k(v hz#R:s3H,J FD0K
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES
~ n$Hf6|G.g'[Fq ('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");5uS`v0a7Q
if(!($insert)) {
j+b^k5k6{3f0_ print "Useronline Insert Failed > ";-`'esp!v
} B2y]
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//delete the peoples which haven't been online/active in the last $timeoutseconds seconds.{"^2CB6}{~2lQ4Me
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");
Jl3r2dR'L` if(!($delete)) {
'y:_f0EI"A$_,` print "Useronline Delete Failed > ";
zj_l,K0MZ.S q }*\$^G]'x{
//select the amount of people online, all uniques, which are online on THIS page@N _rs
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");;RV!R}9^
if(!($result)) {s D8c \$UE6K3Y
print "Useronline Select Error > ";
%u
dxT?9Q1@ E x5D }jA2Q,vr
//Count the number of rows = the number of people online
3`@\,V&Od.Kuk $user = mysql_num_rows($result);4us|jQ0]+?#|
//spit out the results4_8VXNZ&{
mysql_close(); Px)~W)[f+ZS.B
if($user == 1) {3T~X'P W9R:?/X
X"o k y3S
print("1 user online\n");
x9_R
O,U } else {9gp'Z1G5h:XT5@;O
print("$user users online\n");
2J*Q`K5q7Z] }
\O!rk5vI ?>
`i4i.w#`.u,Qa0]4| [url=http://www.now.cn/vhost/][img]http://b.todayisp.com/bbs/760x90h.gif[/img][/url]
| LQ]0]5W+o_ O4U:o0F 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。
4f0rix }2A^ 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。i"f$}5csJ5@Y#]&g
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。
'cxE7X] 当然啦，这两款主机也是相当不错的。
@"ys[ja 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
m&`w,dP 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0zFGS#eYcb
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]
)N*j!h0N/NlK&j"t 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]
c vY?r 自己加QQ去问吧。

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