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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！
,s:hwmXq,B 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。
3k{` {E\'@6h 首先我创建MYSQL数据库表。#P
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CREATE TABLE tablename (kEm dC3Yi
field type(max_length) DEFAULT 'default_value' (NOT) NULL
e:qVb]mP#E?S }可以使用的SQL语句。X#L
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CREATE TABLE useronline (
j1~{6Q U timestamp int(15) DEFAULT '0' NOT NULL,
)O)? gb7x|(D&ko ip varchar(40) NOT NULL,
?"Hj+~AG file varchar(100) NOT NULL,Q(?J:J%{%z_
PRIMARY KEY (timestamp),
$h0O ]a(F(v KEY ip (ip),
w'A$CS:I'p\ KEY file (file)6[0{Q
}k0S.N
);下面我们是PHP脚本，首先我定义MYSQL的信息。
3}c)~j9{Sy $server = "localhost"; //你的服务器koG{.D)r(l
$db_user = "root"; //你的mysql的用户名]1r3{5v`j,\3v
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$db_pass = "password"; //你的mysql的密码,F?O
ABiz
$database = "users"; //表的名字设置统计的时间(多少秒内在线人数)
5d
d
D|5z1EFm $timeoutseconds = 300;取当前时间。
jC]uc~&?%X:z $timestamp = time();上面的完整代码：.cb(I3F#[G&JV9L2^
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<?php-Z6]t7T2P+~0UwnGr
$server = "localhost"; //your server
qqoW8R&wLk $db_user = "root"; //your mysql database username
?m(Cdb `@ $db_pass = "password"; //your mysql database password if any1h$Zc tOG1z.?$aj
$database = "users"; //the db name
8c ~,IE3v TJu6W#Y $timeoutseconds = 300;//timeoutseconds limit_L3{Zf
//get the current time
8e-i(?:j V"|c^{ $timestamp = time();+Zr*j:~%YTb
//calculate the lowest timestamp allowed/Uw4N0el ZqG[:L
$timeout = $timestamp-$timeoutseconds;
7r UQ7LO2p*ne0\ ?>连接mysql
e#A.G]5t*@ mysql_connect('localhost', 'username', 'password');也允许使用变量形式。
bWm,~dSzV7o mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接
1dnD4N8gZ mysql_connect($server, $db_user);查询数据库的代码：f0@$sc]N
mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。*Q v5l'v ~[J
$insert = mysql_db_query($database, "INSERT INTO useronline VALUESB@s]U
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");-ok j6e_I
如果用户用错误信息的话，这样处理。dTrE
m
if(!($insert)) {
2T| C)}%T5~?-i+L print "Useronline Insert Failed > ";(x+V&O4tu4SDx;W}!v
}然后实现当超过设置的时间就删除该用户记录。
)]P'zi2sZ p $delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。6ty
x0uv#A d5Wq(WX
if(!($delete)) {

P y Kh#ik2H print "Useronline Delete Failed > ";
dkOe
D3I#I7sI]"f }下面我们解决数据库中不同IP的问题4`r&t[Gs8u'Z
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用'nf5vSa/M i+K
mysql_num_rows(query);来统计用户，代码如下。P3?
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$user = mysql_num_rows($result);最后关闭数据库。
z O9Z7\ ke mysql_close();显示在线的人数。&KX~ V3s)a
if($user == 1) {2xs){3G)\
print("1 user online\n");E-@n{ fIy
} else {
qK}9p2C{FOV print("$user users online\n");3x~0Q ]Vb)y%u
}最终把上面代码写成一个PHP文件如下。
-_5JQ4BC5D} <?php3GF5b+p0B|d[
//Put your basic server info here
+}4w3n(z/s,h4k $server = "localhost"; //normally localhost
5O?U5@zt-v5c,I $db_user = "root"; //your MySQL database usernamebzl5f$F ?
$db_pass = "password"; //your MySQL database password w?R!H"y(V;Uu
$database = "users";/XGO:@i` p*y5Zy
$timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably are
o3pat {S // offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last
{)iS#O+Po9dr // $timeoutseconds seconds)
W)FT] L //this is where PHP gets the time
T1d@
@C6gu] k $timestamp = time();&|v&K\W1U
//counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed
+uUaD.V$SO5\#G-l $timeout = $timestamp-$timeoutseconds;
Y(HTO P0m+V,T //connect to database
7M-PZ(Zt'y'}h4Zw mysql_connect($server, $db_user);'wu5W-M5|"UT8j
//add the timestamp from the user to the online list?6KL;bq dPk
$insert = mysql_db_query($database, "INSERT INTO useronline VALUESjlsKsK[#ki:m n
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
3i5\V n GA_ if(!($insert)) {6|7N l.?b
print "Useronline Insert Failed > ";
6gPuu \;h gk }
:_9u]+Xtm //delete the peoples which haven't been online/active in the last $timeoutseconds seconds.
(`"x@9rnz(t'b8z $delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");
^-BI/_$s%x6a%_"S4J(we if(!($delete)) {
lO e,Zfv1YCB print "Useronline Delete Failed > ";
2pAC [cmg1Ai }
s9\,Y6_/|)R?h //select the amount of people online, all uniques, which are online on THIS page-E}V U*^*MDi7x8lq
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");
1qnF7cWT'e~9O if(!($result)) {N6s w!f$K-cP
print "Useronline Select Error > ";
m N4Jt!rbL4E }E&z4lk0g%g1E
//Count the number of rows = the number of people online5|:C8d"o#\PL M
$user = mysql_num_rows($result); oay:DN+vF#@
//spit out the results
&vtk+j?{%Q mysql_close();
.r pz!U3Sy7b_ if($user == 1) {
{a/f7~3^gO print("1 user online\n");
*V$nr
^8X7m/M!QE } else {
9X`T)f&e0c print("$user users online\n");
-gXP Yy oDW-t#x2X&T }
T&R1}J`C ?>-aOZ:I2k|%]&O1v-f!K
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YZ/DTTx#r 以上代码我是在时代互联提供的免费试用主机上测试的，感觉效果还不错，性能很稳定，不信的话你也可以去试试。当然，记得指出我这个程序中的不足先哦。
0~l)a0}(S:e 时代互联是行业内最早开始提供PHP 虚拟主机的公司之一，现在已经是的金牌域名注册商和中国互联网客户满意度十佳单位，产品功能已经非常完善 ，特别提一下几个特有用的功能：数据库自动备份、免费集成繁简通简装版、多域名绑定、多子网站支持、GCDN 网站加速器、镜像加速、高级访问统计系统、支持WAP、可选电信/网通/香港机房。
R a ~Rs 我之前建站的时候选的是他们公司标准商务E型，因为这款机型还特别支持ASP.NET3.5(3.0/2.0/1.1)/ASP。
SN*lg
ez1IN 当然啦，这两款主机也是相当不错的。w)E5e9rt4S*[P;k^%[:N
智强商务B型：Unix /Linux 操作系统+独立网页空间1000MB+送1000MB邮局空间+100MB MySQL数据库空间=1869元/年
o!OT'BU(Qzsn5pn%l 标准商务B型：Unix /Linux 操作系统+独立网页空间500MB+送800MB邮局空间+60MB MySQL数据库空间=1365元/年:F/Psxg8DT
提供一下这个公司的联系方式：请见：[url=http://www.now.cn/vhost/]http://www.now.cn/vhost/[/url]
p3rnG,G9b~R#gQ 空间专线： 0756-2623871  QQ：168075865，好象还有全球免费网络电话:全球免费咨询电话 [url=http://www.now.cn/callcenter/call.net?LineName=55]http://www.now.cn/callcenter/call.net?LineName=55[/url]#D$J3Lx-gJ#T
自己加QQ去问吧。

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