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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！ak3W r0~LR*d
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。M~M[hUD&{
首先我创建MYSQL数据库表。
"UeoH5l CREATE TABLE tablename (A1k0zz/{b @7GA
field type(max_length) DEFAULT 'default_value' (NOT) NULL
_-g7~Xn }可以使用的SQL语句。k1U+} N6h4h&W k5i)At
CREATE TABLE useronline (
:?4|PD.x timestamp int(15) DEFAULT '0' NOT NULL,
CB2QnVn&ia ip varchar(40) NOT NULL,
6H:]1z8k!`a!w file varchar(100) NOT NULL,
Y/yIA b PRIMARY KEY (timestamp),|/k5SD6}Yk
KEY ip (ip),dtB$Zk B
KEY file (file)Z,Qqi&s-?
);下面我们是PHP脚本，首先我定义MYSQL的信息。
A%H(K8e z2]N2S"] $server = "localhost"; //你的服务器^ k p8e9b2r]:^$fS
$db_user = "root"; //你的mysql的用户名2iEZn(l]7|/N/QQB
$db_pass = "password"; //你的mysql的密码
E;o3]-u
_i $database = "users"; //表的名字设置统计的时间(多少秒内在线人数)\6o3M3_Y)v&j%i
$timeoutseconds = 300;取当前时间。
-I ql:OW2F(O%L $timestamp = time();上面的完整代码：
7V!M%I It
e <?phpI7o&r!x/D
$server = "localhost"; //your server5a#^;Pvaij
$db_user = "root"; //your mysql database usernamey,DmY)yN
$db_pass = "password"; //your mysql database password if any
z8M iW!H4hhKZ $database = "users"; //the db nameY.]Z,O;a"?+|&o
$timeoutseconds = 300;//timeoutseconds limit

aO;ea Tw3v //get the current time
] d-d3[8[kZsd $timestamp = time();
0u;PI3@,TF6Fl~z6W //calculate the lowest timestamp allowed
;K(l i9R!eg $timeout = $timestamp-$timeoutseconds;4f JVr@EC
?>连接mysql O+l M^7u+f5_/X0|
mysql_connect('localhost', 'username', 'password');也允许使用变量形式。
g1^6rmk.A mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接-q]F3} Q*v hm
mysql_connect($server, $db_user);查询数据库的代码：I`ZN9Vx#Q'Ho
mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。

CQb6D[ x7?1l3o $insert = mysql_db_query($database, "INSERT INTO useronline VALUES9Y g+a],R'Vl
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");/uz9q;[q-q` f
如果用户用错误信息的话，这样处理。
6{OSniY/I$l(c(\ if(!($insert)) {
!K_TY;D6a print "Useronline Insert Failed > ";y"N"[Dj7E0f.P
}然后实现当超过设置的时间就删除该用户记录。%sJ%~6nd {,il7jd?o
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。n#}!bm!il$gP'D
if(!($delete)) {
,E"fo_S bWI5` print "Useronline Delete Failed > ";
V8bB)zP_ }下面我们解决数据库中不同IP的问题
%v-qe,vr e $result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用'dZHs+U
mysql_num_rows(query);来统计用户，代码如下。
:R7w8BP ~VT $user = mysql_num_rows($result);最后关闭数据库。
6l)_rEN l mysql_close();显示在线的人数。
[5\^ENf1Km:M;W if($user == 1) {"n'FbI0{-X
print("1 user online\n");u?O0f*O4}I2^f
} else {
BT(V T `JlN print("$user users online\n");
)|:[VQ_,qV }最终把上面代码写成一个PHP文件如下。 Y~~.w5Rs,m NKT
<?php
P }!\$H*^ //Put your basic server info here:N4y|[g'w
$server = "localhost"; //normally localhostY A`{/skeV$g9u
$db_user = "root"; //your MySQL database username1ju&s.lrSkQ v
$db_pass = "password"; //your MySQL database password
+P&r i]l*@ $database = "users";{wv)H]B@
$timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably are5FR&T9QwBEy
// offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last
4yb}b'Hs Y1f4? // $timeoutseconds seconds)/G,odgkbBp_
//this is where PHP gets the time[;SkS:[p$@-[ c1p6t
$timestamp = time();
ew.O6A9LA&[ xu7x4P //counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed+Q#XvM4?2i1I1t[-i
$timeout = $timestamp-$timeoutseconds;3UM9~x4u P
//connect to database'K`\pGX
mysql_connect($server, $db_user);&G!VqcW4kX
//add the timestamp from the user to the online list%Z ?k.Z'bw/k`
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES)Tg$`k.^O n,x`6o+@
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
d|sbG?]4{e,` if(!($insert)) {8FtDiX;H;g%?Je
print "Useronline Insert Failed > ";
p&n8J3u2O%td7y }9v0rorZ6TGLI
//delete the peoples which haven't been online/active in the last $timeoutseconds seconds.
;J|(W_L(? $delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");
Yz(~$^$P if(!($delete)) {k"U {^&b/q|g
print "Useronline Delete Failed > ";1\M}f^o1_e4l"O2O
}
$Jz9Z }x8tW&| //select the amount of people online, all uniques, which are online on THIS page
uEE1c3^5a} $result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");&Ls7{cY
if(!($result)) {
8t;lnM,i4]_:~_ print "Useronline Select Error > ";
&g(lO8al }*k*R$|qM | odC)w
//Count the number of rows = the number of people online
'U(` }EX $user = mysql_num_rows($result);
J-{Tw_2y:A,Rj:L"Aa //spit out the results.Z
V8H$p-HJtG`
mysql_close();
7T-T8l4I V6w if($user == 1) { mC ? f4N
print("1 user online\n");H9Ov2LW){.jY
} else {
kqI;KP4d}4o print("$user users online\n");3Oq,U8m)jdIy
}7F'X3l_#c
?>
P`@
Ic(G[? [url=http://www.now.cn/vhost/][img]http://b.todayisp.com/bbs/760x90h.gif[/img][/url]
SI;ZV]`};z 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。-x VR"h5P#Y0IP
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。
gt.ZmJD)w 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。 ?PE dlW3h
当然啦，这两款主机也是相当不错的。

@zuuPqk-V"w3b 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tt)bR2hA
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
H&s;oL"A/j2Me"bm 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] !m.V qhi'_*I
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