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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！Z oU0u G
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。(}euc0v Y7e"w#A
首先我创建MYSQL数据库表。
"B9qU xk CREATE TABLE tablename (]G3tGuSXcTC
field type(max_length) DEFAULT 'default_value' (NOT) NULLkHjS7l4@&S
}可以使用的SQL语句。5F:kG+c,dn
CREATE TABLE useronline (
:Mx!ghD timestamp int(15) DEFAULT '0' NOT NULL,
~o A`s[ ip varchar(40) NOT NULL,7[6o[9t4Y0n0t
file varchar(100) NOT NULL, ]keW`
PRIMARY KEY (timestamp),b(i+R(t?-e
KEY ip (ip),i*b%` j5w0@xq
KEY file (file)]y:W0`)L;Lv5P
);下面我们是PHP脚本，首先我定义MYSQL的信息。
(wAU/hfg(DlN $server = "localhost"; //你的服务器
'O2x5mP'b $db_user = "root"; //你的mysql的用户名
L-^L9Ul $db_pass = "password"; //你的mysql的密码0A*OvM9yEC7gc
$database = "users"; //表的名字设置统计的时间(多少秒内在线人数)
8o/s)`*e7DF S:o
l D q $timeoutseconds = 300;取当前时间。
K/W.I,Gz&YI $timestamp = time();上面的完整代码：
9h2l!~QX_1D.h ry7]2Y <?phpp}~jp6H
$server = "localhost"; //your server s0Rk6o(V4_
$db_user = "root"; //your mysql database username
;W6nmRxITpW $db_pass = "password"; //your mysql database password if any
{$uR
L N$?2v $database = "users"; //the db namee9^[l@N
$timeoutseconds = 300;//timeoutseconds limit*n"@^p(m Nr
//get the current time
u9m3Q$Rs $timestamp = time();
f3\4`
b){y7] //calculate the lowest timestamp allowed
%@6TE SV@!iY&Lx$C $timeout = $timestamp-$timeoutseconds;2p*g5bxe,S
?>连接mysql0u(I7lo2t!X\Fg
mysql_connect('localhost', 'username', 'password');也允许使用变量形式。
{
RvQadS mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接1rg-?+a!zU.R#n,{
mysql_connect($server, $db_user);查询数据库的代码：|2i8_'[*Q#K
mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。_
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$insert = mysql_db_query($database, "INSERT INTO useronline VALUESRlq.~)V
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");@J(F)Pt
如果用户用错误信息的话，这样处理。6}tt}y1bx,L o
R
if(!($insert)) {

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a$`
O+T_'E print "Useronline Insert Failed > ";
d7gU4}6f.]3D| }然后实现当超过设置的时间就删除该用户记录。3?v\"y,j j
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。
g l,Z)}]1M)S[7B if(!($delete)) {
)|*_w(z)Lho print "Useronline Delete Failed > ";K?["c f:F?
}下面我们解决数据库中不同IP的问题
N6?4L F*DhAZ $result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用`!fm(n` W
mysql_num_rows(query);来统计用户，代码如下。
B%q7Jcq7f9xQ7Oq $user = mysql_num_rows($result);最后关闭数据库。
2im wd3Z mysql_close();显示在线的人数。
3h-?9^?G:R@*RNO if($user == 1) {
2_1JcuL print("1 user online\n");"f}/O XD+d)A
} else {
0xD3}OT print("$user users online\n");)KvLkEC#W&t0{;C3]
}最终把上面代码写成一个PHP文件如下。
+X3g Vc%}HL <?php
i4KQ2pa //Put your basic server info here
]M \H[G+G[ $server = "localhost"; //normally localhost
9}A0sX;PI $db_user = "root"; //your MySQL database username
8T8mq2Hk5N]qG $db_pass = "password"; //your MySQL database password,f hs l'R3j$MW#c
$database = "users";w`` az7p#V
$timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably are
}4o)~!kWY'bt5Fo // offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last1af&@hz
// $timeoutseconds seconds)8bH'Z+kYV2rGDyt
//this is where PHP gets the time{e;i'k6zO)p.\
$timestamp = time();
,Kn/^r4dX //counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed
*l)^h.dG $timeout = $timestamp-$timeoutseconds;
{Bz9jd!k //connect to database9e9a~U1x#K lw#L)|,F3D3X
mysql_connect($server, $db_user);4aT/ge)lt|,}
//add the timestamp from the user to the online list
p)n'~utZI $insert = mysql_db_query($database, "INSERT INTO useronline VALUES
m5q"d7n%o/}Qn+h ('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");,]0Gu7cGt5b,Q?
if(!($insert)) {
k:LEqr@#shoV print "Useronline Insert Failed > ";
1p+d![1{bsI
^"J };B ?;J[&|$ckR\&b
//delete the peoples which haven't been online/active in the last $timeoutseconds seconds.Lu9k%a(\ b_n
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");,^|?yh
F#^!z;j W
if(!($delete)) {
0o~5U&^9OJP print "Useronline Delete Failed > ";s;Vg@NC!|:`t@3F
}5?_;l2~;V8k
//select the amount of people online, all uniques, which are online on THIS pagel$[ \D j:G
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");)P5{)_/~Q\)h/jRx
if(!($result)) {
l ~k%iU print "Useronline Select Error > ";
/^*B|%g7`3co }
Dw4z Z9U //Count the number of rows = the number of people online$f1f)P6d9JL``
$user = mysql_num_rows($result);
-\#[P~l)i:x_ //spit out the results5O9C4Zm HBgV9Y/B
mysql_close();
KG@S6d]j if($user == 1) {$gn R-CiV1n*^hys
print("1 user online\n");!@lss6_9PS2v@Dq
} else {/}1@4xb!R)N~!L
print("$user users online\n");s VN1m,V
}
]B4QGk{4AD~.l*C9? ?>%lH'AN{
[url=http://www.now.cn/vhost/][img]http://b.todayisp.com/bbs/760x90h.gif[/img][/url]i&@7_#Pt1g4[!Bjv,\}
以上代码我是在时代互联提供的免费试用主机上测试的，感觉效果还不错，性能很稳定，不信的话你也可以去试试。当然，记得指出我这个程序中的不足先哦。
XLLqU+xQd#f 时代互联是行业内最早开始提供PHP 虚拟主机的公司之一，现在已经是的金牌域名注册商和中国互联网客户满意度十佳单位，产品功能已经非常完善 ，特别提一下几个特有用的功能：数据库自动备份、免费集成繁简通简装版、多域名绑定、多子网站支持、GCDN 网站加速器、镜像加速、高级访问统计系统、支持WAP、可选电信/网通/香港机房。7?{l4I;MX/@d
我之前建站的时候选的是他们公司标准商务E型，因为这款机型还特别支持ASP.NET3.5(3.0/2.0/1.1)/ASP。
1I&A*T#ZP.J*Th$N? 当然啦，这两款主机也是相当不错的。lj D!@8v1m!OVJJk{
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
adN8~)esj/`F+SG 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_$eo+Q$?U|r
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] rs z0Ow,e
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]
6uD3^-Av 自己加QQ去问吧。

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