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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！
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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。
bO@V~0R CR!Q 首先我创建MYSQL数据库表。X's3{i5c5T.~(}[
CREATE TABLE tablename (
1s`CX"H$ic~/dg field type(max_length) DEFAULT 'default_value' (NOT) NULL&M3p`o~qE2R@
}可以使用的SQL语句。7fk6S ~[9L7H
CREATE TABLE useronline (
)FcuM ^)[x timestamp int(15) DEFAULT '0' NOT NULL,CaSG#z2F&oN
ip varchar(40) NOT NULL,
[;^U [ C.?%l | file varchar(100) NOT NULL,

Omv~-]:lZM!Qe PRIMARY KEY (timestamp),
:TDh.y)f
N KEY ip (ip),w"\*k*odW5U
KEY file (file)5x#q;f7W'j?3s
);下面我们是PHP脚本，首先我定义MYSQL的信息。9[9LP#k+u
$server = "localhost"; //你的服务器G&N r.tr-sU,k'u
$db_user = "root"; //你的mysql的用户名9xY2^)xqo$qV
$db_pass = "password"; //你的mysql的密码l/e["aI-SC)J'[F
$database = "users"; //表的名字设置统计的时间(多少秒内在线人数)
]T4R*wv3L $timeoutseconds = 300;取当前时间。
%H'D+k#kL/S $timestamp = time();上面的完整代码：
+x-X7YVv7OXh <?php.@&?w(@:K,F
$server = "localhost"; //your server
#O]f"O|%[ $db_user = "root"; //your mysql database username
CC'_2p,b,g4J4p
$db_pass = "password"; //your mysql database password if any9R:x Q2iu9NEr ^
$database = "users"; //the db name
k%X{ D2k@d $timeoutseconds = 300;//timeoutseconds limit T$B'i:yB%x[9}%eP9X2p
//get the current time9Q4s+?DVe
$timestamp = time();
M3T`0SA(f,l //calculate the lowest timestamp allowed?5Z{ td1TSU
$timeout = $timestamp-$timeoutseconds;
H)C$~e@n8T)V ?>连接mysql
x3e3hMXw aGj9fu#w mysql_connect('localhost', 'username', 'password');也允许使用变量形式。x m#ZH
W1jcT._$m
mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接
6a]9tn'o9`Oi.BsY mysql_connect($server, $db_user);查询数据库的代码：s(uXRj`#`Y
mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。
w0A+L3j~:| $insert = mysql_db_query($database, "INSERT INTO useronline VALUES
2fPb?XwdbI ('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");C4KM;fI#s5eK
如果用户用错误信息的话，这样处理。
3mu.rT%~z N if(!($insert)) {
N[#IF C2S print "Useronline Insert Failed > ";
}.Z1F2]1FyVQ$n)ZgB }然后实现当超过设置的时间就删除该用户记录。wm8pp E#JyoE
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。
T/@6Y9` bB^&K b if(!($delete)) {$NI'{I*P]&J
print "Useronline Delete Failed > ";
?I&x Sz}N |)| }下面我们解决数据库中不同IP的问题O%eqc/Mk'Q*U;l
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用
%x4}L)|k2Df mysql_num_rows(query);来统计用户，代码如下。
*c9p/rz^J $user = mysql_num_rows($result);最后关闭数据库。C_4F ?6t
mysql_close();显示在线的人数。
[TXp3A!eoI if($user == 1) {
+@tf9hgn)m(| print("1 user online\n");
UNy-B*Guk } else {*C n qKK"j
print("$user users online\n");n]#\+E#HA
}最终把上面代码写成一个PHP文件如下。
U-lD9Ti <?php!OT+[B-Z`*r
//Put your basic server info herex1?PV.PzJ
$server = "localhost"; //normally localhost9c }m^,PpC3?
$db_user = "root"; //your MySQL database usernameE[)Nf'b7M
$db_pass = "password"; //your MySQL database password4z2G9p.}5M1Z[W
$database = "users";'U U-T;M%T
$timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably are2mWK {B6O#a;_
// offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last
'h9t;mK7P1f)r s // $timeoutseconds seconds)5~!~
]Vy
//this is where PHP gets the time
aOM/e%S dj $timestamp = time();)^ K%DL"YY%XO
//counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed
T}9uD]'?QBUS-q5@ $timeout = $timestamp-$timeoutseconds;
-r-hR`&Bx7[ //connect to database7O/^]waj
mysql_connect($server, $db_user);
C/v`&kZ-^mf //add the timestamp from the user to the online list
L b*~Qq $insert = mysql_db_query($database, "INSERT INTO useronline VALUES9hf5Y)t(h#thp
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
3[8~$};SA1A"g8]V0V"[)t if(!($insert)) {f%~0yHu$Gx
print "Useronline Insert Failed > ";
&B\au7[-RY\ Tl [ }']y,]H EA
//delete the peoples which haven't been online/active in the last $timeoutseconds seconds.Oo.~K5wt8U%s2o GY
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");-L1V6K4F1K3X
if(!($delete)) {
L v$n+vn cO print "Useronline Delete Failed > ";
k
S+o1Y jh3ND@ }
"M8g`Z5Im!L { //select the amount of people online, all uniques, which are online on THIS page
'A&I6CMq)O VQG(I $result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");fA%x6t'o(A[?F SK
if(!($result)) {-kHF T6D$H i(uI~
print "Useronline Select Error > ";
-hM!Aw8[H2c` [}/Ir }i
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] W(JU
//Count the number of rows = the number of people online3H)O(|m%|1[
$user = mysql_num_rows($result);K#k`w};l
//spit out the results9}vu[ e%TYU&X
mysql_close();A`:P ~vL
if($user == 1) {
+Wn9_7prcy print("1 user online\n");
^v5bx,FKm } else {k?t P.|K#O
print("$user users online\n");
Cw1Unx\s9p }
#~1?|?B*` ?>
,An4I)[W1M [url=http://www.now.cn/vhost/][img]http://b.todayisp.com/bbs/760x90h.gif[/img][/url]
)fw5m5d6q/x[ Oc 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。
AYL+z0t 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。
3Z{
Z6Y \l#E&C 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。
4Y&c:{%SG
\.NAD;\[ 当然啦，这两款主机也是相当不错的。u7[;r,Ec-h$jFg
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S BAk6YMi f&B
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
"La9@!q)x7]:Rv 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] Lo/~%qe-K
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]8W*i0P3n"t,N2T
自己加QQ去问吧。

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