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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！Q%{/K*]!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。`XB _Ff
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首先我创建MYSQL数据库表。
ST,Gf7jl CREATE TABLE tablename (%G3W7vVF.`"j/|
field type(max_length) DEFAULT 'default_value' (NOT) NULLI,c:~jT8\ I"M
}可以使用的SQL语句。4sG8Z*BCZi}
CREATE TABLE useronline (
'ZVP9k'Hc!~ timestamp int(15) DEFAULT '0' NOT NULL,(lvz6r(ZA2?Nm9E
ip varchar(40) NOT NULL,
#],k"mVRnA
]YI file varchar(100) NOT NULL,
FH4@N*so R,k\q8S PRIMARY KEY (timestamp),
/k%C#{xl f,lp'E:? KEY ip (ip),
rN%g/o oDY KEY file (file)
7[E2e$K$W1^ );下面我们是PHP脚本，首先我定义MYSQL的信息。
7T8Z%n(C
pZQ
k $server = "localhost"; //你的服务器G4RKwu3H
$db_user = "root"; //你的mysql的用户名
L4V,M-t7?Ft $db_pass = "password"; //你的mysql的密码
.@)R)U;{ jL $database = "users"; //表的名字设置统计的时间(多少秒内在线人数)
eK5J^%m(k $timeoutseconds = 300;取当前时间。1QC(F(d`@
$timestamp = time();上面的完整代码：
t G"i8fWc <?php
n}#PC^Q $server = "localhost"; //your server
}"N2Z[F-G_ $db_user = "root"; //your mysql database username
ju\T TE$~xVP
$db_pass = "password"; //your mysql database password if any PSr[DS],f+DC
$database = "users"; //the db name3Ufh2eh!a@3W~
$timeoutseconds = 300;//timeoutseconds limit5d*N y&A5xj
//get the current timeS-^p Ht'm%L&HA"Z
$timestamp = time(); U#M c2c_:mODd
//calculate the lowest timestamp allowed
a-~'k;x%i1E $timeout = $timestamp-$timeoutseconds;
&@g-v0b!C ?>连接mysql;pL;[v#~'J
mysql_connect('localhost', 'username', 'password');也允许使用变量形式。#_?9KI]
mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接
N/JR'q@'R"k s mysql_connect($server, $db_user);查询数据库的代码： MX0D?(l:Lm+h,@u7Q*f
mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。+Wj'ao+_M,~\m
$insert = mysql_db_query($database, "INSERT INTO useronline VALUESs;wD+cJs}lb%i*S D
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
)\`L2aa
mB+s:w 如果用户用错误信息的话，这样处理。+c#W.R r_paXT
if(!($insert)) {
$A
Q l0}$xU print "Useronline Insert Failed > ";
$h:n Lg%m }然后实现当超过设置的时间就删除该用户记录。)M:No
\+ckf
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。
{4|^V {tbFd if(!($delete)) {[0Te5W#B/J`
print "Useronline Delete Failed > ";
\FD@}"?mb*_P }下面我们解决数据库中不同IP的问题

G_Kzm $result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用
d3vqtB9R mysql_num_rows(query);来统计用户，代码如下。/?L(I8x1p2_
$user = mysql_num_rows($result);最后关闭数据库。.oZH3IMZR5hYb\
mysql_close();显示在线的人数。2DM&G9sy$]H
if($user == 1) {
ADN[D print("1 user online\n");}-O6o-c+Ki*y
} else {
Gc&H7vd^ print("$user users online\n");
o!CdG B(jL }最终把上面代码写成一个PHP文件如下。7qK2? s
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<?php}? Z8G\ z-lq0s5l^$n ~
//Put your basic server info hereP
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$server = "localhost"; //normally localhost
h+Pw} J,}"A2]S $db_user = "root"; //your MySQL database username
,ar$qh0B |m.n $db_pass = "password"; //your MySQL database password
3IB;OJ&PuFK D $database = "users";/] `N,?5AO
$timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably arec#qex9g'Io
// offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the lastdo{!W^$P'nm/}7V
// $timeoutseconds seconds)
|,CpF6\&b/Ni.l)M //this is where PHP gets the timerS{}A/nPy
$timestamp = time();
#a$W~iZox //counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed!A:_&stZ
$timeout = $timestamp-$timeoutseconds;r|*^{)I5DmS0d
//connect to databaseX7G/\8j;zNK;^X
mysql_connect($server, $db_user);"n'`%l5|"N!R
//add the timestamp from the user to the online list
+|l(B U9D#]| $insert = mysql_db_query($database, "INSERT INTO useronline VALUES+R2T"b;C/{C0G
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
7Q(?:k/lSrk.s k(qd.?m if(!($insert)) {8Mg%w^0a9a
print "Useronline Insert Failed > ";
"~n]| l)C*R,F'gr })~2H#{)R!yi%[0G
//delete the peoples which haven't been online/active in the last $timeoutseconds seconds.#}:R-AJ/g-Z5xD
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");
)n&Dh Uo6R if(!($delete)) {
!JC-?X`"F:Q print "Useronline Delete Failed > ";
2WZ(zcnGS2F }
w?1g&j$hv
//select the amount of people online, all uniques, which are online on THIS pageqyz(c6H3j5\;s
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");

tIpU)g2zW if(!($result)) {

B6^6Z'mLO print "Useronline Select Error > ";f"S7r\*X
}

Czif^x\
L3W%L f //Count the number of rows = the number of people online*E;c-l+KEXj;U
$user = mysql_num_rows($result);-k ej.s,yZ3c.o?
//spit out the results
[5Fz R`u b'v#D mysql_close();
&IQF7i
r0J)H if($user == 1) {Q;w2Lfq
print("1 user online\n");vMy!_&[
} else {P(Q9w&D7Af
print("$user users online\n"); Qxo(zVtqW
}0D1fY_*Oiil,X-Vv
?>
hCj|9D't7m{ [url=http://www.now.cn/vhost/][img]http://b.todayisp.com/bbs/760x90h.gif[/img][/url];X$R1b@+VnEk:^
以上代码我是在时代互联提供的免费试用主机上测试的，感觉效果还不错，性能很稳定，不信的话你也可以去试试。当然，记得指出我这个程序中的不足先哦。
8d?0]
K*^ 时代互联是行业内最早开始提供PHP 虚拟主机的公司之一，现在已经是的金牌域名注册商和中国互联网客户满意度十佳单位，产品功能已经非常完善 ，特别提一下几个特有用的功能：数据库自动备份、免费集成繁简通简装版、多域名绑定、多子网站支持、GCDN 网站加速器、镜像加速、高级访问统计系统、支持WAP、可选电信/网通/香港机房。&aN%wtGxU-e
我之前建站的时候选的是他们公司标准商务E型，因为这款机型还特别支持ASP.NET3.5(3.0/2.0/1.1)/ASP。"sqbOg`H*e@%mD/V
当然啦，这两款主机也是相当不错的。
\/BH$t(j$U 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/f,].yjg6K
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.R3r0@|N&{,k
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+gt-a'xr"`.R 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]EYi(}%_
自己加QQ去问吧。

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