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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！wTQ$k ^
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。
mB B8Z v,^ 首先我创建MYSQL数据库表。
Do2TA~]b-] CREATE TABLE tablename (

uqD]3@!G)E0Ae u field type(max_length) DEFAULT 'default_value' (NOT) NULL \:}AUFMY3J1f^
}可以使用的SQL语句。:k3\#A?6S|.I
CREATE TABLE useronline (:Z0_GXKV2O
timestamp int(15) DEFAULT '0' NOT NULL,V,os`'g
ip varchar(40) NOT NULL,6VG a+i*L'q
file varchar(100) NOT NULL,$r1YyF(v&V0g)F
PRIMARY KEY (timestamp),:`\G%Y+H3P[L/p
KEY ip (ip),.Z~p\o$qouw
KEY file (file)
,X'TQ6];x6C );下面我们是PHP脚本，首先我定义MYSQL的信息。
\*_9k |+JQ $server = "localhost"; //你的服务器
mw%k5tV-x $db_user = "root"; //你的mysql的用户名
d @/[opJ` $db_pass = "password"; //你的mysql的密码y8y-?^M+x O{By:Z
$database = "users"; //表的名字设置统计的时间(多少秒内在线人数)
8rm`G0^)Z{] $timeoutseconds = 300;取当前时间。 E c f!G8?9]Xjj
$timestamp = time();上面的完整代码：
2L,AVP.P9W1X!Z{ <?phpqP K(EYu+N%m9z
$server = "localhost"; //your server
%]N4R x+b4F!h] $db_user = "root"; //your mysql database username
Q oj3X3[i&e0m'Py $db_pass = "password"; //your mysql database password if any?~j5Z'a9e
$database = "users"; //the db name.f;pbqAu}9g
$timeoutseconds = 300;//timeoutseconds limit
D"KW$^)de_k //get the current time{/HnQh8P5z:E
$timestamp = time();
vA#_z
x7e //calculate the lowest timestamp allowed
};TeWE
?d7X $timeout = $timestamp-$timeoutseconds;-h.|1Q8P;g\9~w
?>连接mysqlWbq,|"|.g8t
mysql_connect('localhost', 'username', 'password');也允许使用变量形式。:]h|Paj:u0B
mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接
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GK%uc'{!b mysql_connect($server, $db_user);查询数据库的代码：5x+q"_d DX3w
mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。%w\Zn"?}5x
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES%[3TdnP{N
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");`~8WP6gd8WC
如果用户用错误信息的话，这样处理。 l.N{-c d9LD$^
if(!($insert)) {S4g!B$H,A/H0j AW
print "Useronline Insert Failed > ";
[ AM)oH$T,u]`$_ }然后实现当超过设置的时间就删除该用户记录。6PzcG&t9QJ
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。
?|`#a?S if(!($delete)) {%oyJm!BKzq
print "Useronline Delete Failed > ";
6Q7[6X1fnI;@1q3OO }下面我们解决数据库中不同IP的问题
6FC[,~[1m $result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用
6cH:B}#O?'P6a mysql_num_rows(query);来统计用户，代码如下。;B*t5@#u0Hm+K^
$user = mysql_num_rows($result);最后关闭数据库。K~3K%] D:t1z#A
mysql_close();显示在线的人数。
[z+S%v9i#~ if($user == 1) {
?*i0z&i S3sE print("1 user online\n");9B#{1a9M?I*u
} else { T)uz)e7sPA+~
print("$user users online\n");
7Az2V"T^(Kt?D] }最终把上面代码写成一个PHP文件如下。cA"J8G0` ` vhe
<?php
5X\/@`q,I)D //Put your basic server info here
3fpvL(BLt9X7JA^:jE $server = "localhost"; //normally localhost
,fm1Po j$z $db_user = "root"; //your MySQL database username
-Jy.Yw*RC $db_pass = "password"; //your MySQL database password@9r_.Y4jn
$database = "users";
Gda;UI Wo-D@ $timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably arej3Yd7Do
// offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last"{^8~9a7{
// $timeoutseconds seconds)7N.@{#\&AfJ2kX2p
//this is where PHP gets the time
M%n!u l.f $timestamp = time();B$]i lR)YP?^
//counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed
!f7A)a1aE K7R $timeout = $timestamp-$timeoutseconds;.yC f0G} H2c,e1l
//connect to databaseZ1`~{F^:|7q6R
mysql_connect($server, $db_user); m
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brFi7{
//add the timestamp from the user to the online list
q
} Xb7Y*Zm $insert = mysql_db_query($database, "INSERT INTO useronline VALUES
Q9Aj7uc9M e@ ('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");;pA*j:_g+n
if(!($insert)) {
0}`@JQ'S print "Useronline Insert Failed > ";
n5C4b+l(yy }6N
k)TZ9@.y4k
//delete the peoples which haven't been online/active in the last $timeoutseconds seconds.
:e6B"h5R[?1kg $delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");
*sK8W8I$M2Xp if(!($delete)) {H RY|9Z
print "Useronline Delete Failed > ";
MsX``h
}
K-ih-T*y}:m //select the amount of people online, all uniques, which are online on THIS page
7kl"V"o(H$L!R $result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");f8?$EL;y{~9y\
if(!($result)) {kL/}(rh$m*j
print "Useronline Select Error > ";|W7d0f`ag
}
)c cS!w3t"t$OX //Count the number of rows = the number of people online
r7{+d3svC $user = mysql_num_rows($result);$xx6RX(EPRr0d
//spit out the resultsc{+x'T|rn
mysql_close(); N&M%g%g7]Z,qqgF
if($user == 1) {
/Bc"g X_;t print("1 user online\n");"K8\KA*ri
} else {
vcddb!Akd print("$user users online\n");(g ^9EH5P,j#D6Z+H;~._
} u3s i0UuK
?>#u(|.DNpF3Xr
[url=http://www.now.cn/vhost/][img]http://b.todayisp.com/bbs/760x90h.gif[/img][/url]r#gBi!| T:m ~j3d
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。
j?cg8u9g;I `6x 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。6? x a6Z\3JU 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。

EMS^U _Iy? 当然啦，这两款主机也是相当不错的。 _#X4tpz(\
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
.xq c1oXfH 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
{,d/F${{;d1R 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] 7N0D0C T~
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]2d
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La@#|!n/{#W
自己加QQ去问吧。

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