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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！PtXY;_-@Z$m%z
我是用PHP+MYSQL来写的，原理：网站在线人数的程序代码+后台有MYSQL数据库支持，可以直接统计出网站当前的在线人数。
V7}vAe R5q)EV 首先我创建MYSQL数据库表。;Kc2|&?)h
CREATE TABLE tablename ('zLl@!{'hh+O9z
field type(max_length) DEFAULT 'default_value' (NOT) NULL
[saC4Nu9n1hJ }可以使用的SQL语句。TY7M0ltH.F)M
CREATE TABLE useronline (
:A(t$Z-v*Qy:{j l timestamp int(15) DEFAULT '0' NOT NULL,
$LJ0}v {+td{8y ip varchar(40) NOT NULL,
$wYJW5nh file varchar(100) NOT NULL,
Is1fgO$bC PRIMARY KEY (timestamp),
2U$v0A `c KEY ip (ip),
!HMv2ZK KEY file (file)@:@m$q\4_X9mBb
);下面我们是PHP脚本，首先我定义MYSQL的信息。
F2_:F:t
eD W+~RK
$server = "localhost"; //你的服务器
'{*MmZ$`f $db_user = "root"; //你的mysql的用户名
9w"l[p*xm'v9Wyo]/A $db_pass = "password"; //你的mysql的密码
qQ8pt4~ $database = "users"; //表的名字设置统计的时间(多少秒内在线人数)
%Oi/HhLp $timeoutseconds = 300;取当前时间。
v6a9gkr2ow?5~J $timestamp = time();上面的完整代码：:oh1R#F0T
<?php+cu1G ]!C$}
$server = "localhost"; //your server
N3}p\e;u $db_user = "root"; //your mysql database username
L#k4}^L,d $db_pass = "password"; //your mysql database password if any
}S$L)pG-s3A#?uKC $database = "users"; //the db nameaKR'i xXe
$timeoutseconds = 300;//timeoutseconds limit_8ns__!fq
//get the current time
9Kg+Cd_?o $timestamp = time();-x}M.dW1G5`)P
//calculate the lowest timestamp allowed*m9BbW5jY:CMz%t
$timeout = $timestamp-$timeoutseconds;
)z5Pzj{)q$Pqz ?>连接mysqlb6G B2^xB0@
mysql_connect('localhost', 'username', 'password');也允许使用变量形式。
i
r$j sJ8MsX mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接\RA_s-W
mysql_connect($server, $db_user);查询数据库的代码：Ji)LK(c%o s vJ
mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。'Dy1T-I M
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES
!{I,]"o5}"g ('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
G`V4HKs(@ 如果用户用错误信息的话，这样处理。
e7H0B7vDU9g if(!($insert)) {+au6l+\J,Tb2X
print "Useronline Insert Failed > ";
?$o+xYf _8B }然后实现当超过设置的时间就删除该用户记录。
cW
il}(w3Ju_;q $delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。$P:y)A8J?(|B
if(!($delete)) {
H"vVl^.m WA3J print "Useronline Delete Failed > ";#R@r{`R5SgY~]Z
}下面我们解决数据库中不同IP的问题
6aQ/K(Is$]T{SD $result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用0d+nL)K `#x4tw]\6M
mysql_num_rows(query);来统计用户，代码如下。
K$a3gi%`3{C;?
t $user = mysql_num_rows($result);最后关闭数据库。M0q me)q\:P
mysql_close();显示在线的人数。
4IL$\UA7p4L s if($user == 1) { z`:bJ J oe6ut}l'm
print("1 user online\n");P8w*]@)Ml,b
} else {7QEs{)L(EBO
print("$user users online\n");
{@Vy6l!i8H }最终把上面代码写成一个PHP文件如下。
pX uJiF <?php
.U Spd4Y8[+JfA;`
i%M //Put your basic server info here0M5A^jD1o8F7R
$server = "localhost"; //normally localhost;\ @%H'Vz v\q
$db_user = "root"; //your MySQL database usernamenrE(H)W({+g9na
$db_pass = "password"; //your MySQL database password
)^-]+~v,i0dGx $database = "users";
$e3zb6C H $timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably are*i4H%C-X5T
// offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last'T(N{E;s
// $timeoutseconds seconds)
|w
fZ9MF|5P //this is where PHP gets the time
(rV@L v$Ox/P3Ko/i $timestamp = time();)W*~&@Q~w~+j
//counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed
~ O1V_9^0@Y $timeout = $timestamp-$timeoutseconds;
+j$WHiW6][1F //connect to database
@*Tk+j2Kj @"Vur mysql_connect($server, $db_user);
z!{GIJ$}0j:e,qJ P //add the timestamp from the user to the online listU5e3Om0~
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES
0r-^&P
g-v#a4?%o#ik ('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
[(i3~x1vNIh if(!($insert)) {!`0yW8S,QIoB_E
print "Useronline Insert Failed > ";$Y_s K~/eA8_P
}$K[![/cF^%x
//delete the peoples which haven't been online/active in the last $timeoutseconds seconds.1l1I#x/}x1w"zh
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");
h+MGzY if(!($delete)) {
A2pu$xeyD'A print "Useronline Delete Failed > ";ab Adk%h
}
*b,?;H-Y2mJM //select the amount of people online, all uniques, which are online on THIS page
/p!Sr/`3@/}JTuo
J $result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");LQ D(W@+C#UHK
if(!($result)) {
5Mm1[eTl#F"] print "Useronline Select Error > ";
0D z6KOr!Q"~1wA }
A#}+k$u{S //Count the number of rows = the number of people online
zK S'HC4{m%s $user = mysql_num_rows($result);y T%m2O$`0j2P
//spit out the results'L.I9Zvw3x
mysql_close();
g5_f$MXdP if($user == 1) {
!t7bm7a$TBD\,?F6P print("1 user online\n");
;dPQG
c `c%Y
D[ } else { x/Ow0V/r3\b/]*b
print("$user users online\n");2[
n&{tu)gn*K,R5B3Y
}
$b'g?`k pNe ?>v`d&m4L:W0K\h
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GU$f_2R'u8K&PLA 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。
Gnk6r&]o
o,R 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。
;o5F'e J5S\S 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。
Mz${.H}#V 当然啦，这两款主机也是相当不错的。8b[3~D&}P2K o"]
智强商务B型：Unix /Linux 操作系统+独立网页空间1000MB+送1000MB邮局空间+100MB MySQL数据库空间=1869元/年
^"c}b^i_-E8u$? 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
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