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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！
r_+Q-U9y c 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。)RG&Y1G(?B F
首先我创建MYSQL数据库表。
e\*GHL'D)Q CREATE TABLE tablename (W*]"Q Lw_Ij.F
field type(max_length) DEFAULT 'default_value' (NOT) NULLd:B T4zmOJk
}可以使用的SQL语句。4`|;o!Y!S
CREATE TABLE useronline (qF'CU-T od9i
timestamp int(15) DEFAULT '0' NOT NULL,
(xI S y9] ip varchar(40) NOT NULL,)v4FQ2]"j/i(C b
file varchar(100) NOT NULL,
)R2^K)N@6l7j:r|(q PRIMARY KEY (timestamp),
A{iT!x2t%MM| KEY ip (ip),G#d6Q!_;p `{9}M
KEY file (file)
[(~&^"h | d );下面我们是PHP脚本，首先我定义MYSQL的信息。
%n$Q;Y9Q*q6w*F5rP+L $server = "localhost"; //你的服务器~XjPZ/wb`
$db_user = "root"; //你的mysql的用户名
}V#@+M6e],?_ $db_pass = "password"; //你的mysql的密码w$UE+E?~c f
$database = "users"; //表的名字设置统计的时间(多少秒内在线人数)
*t2v'Jo] hMI{V3f $timeoutseconds = 300;取当前时间。
3M,Og@!I2JqX*b_ $timestamp = time();上面的完整代码：
v7T;BF/K\t^ <?phpDa'tZ7O
p3|B
$server = "localhost"; //your servera!\V"yJ-ghU
$db_user = "root"; //your mysql database username
fU VC1x2x5i3i $db_pass = "password"; //your mysql database password if any
N&W5c?G/B $database = "users"; //the db name
2h
UT?+TM&E $timeoutseconds = 300;//timeoutseconds limit/R3lG+{U}0U(X
//get the current timeN!K2?7|:N4C7iVq'sq
$timestamp = time();
0Nn#kZeR+SvWc //calculate the lowest timestamp allowedh*|3B;[u
$timeout = $timestamp-$timeoutseconds;
^^?#P4b.T2c4qbG ?>连接mysql[!qvV*T$^3Y}3T
mysql_connect('localhost', 'username', 'password');也允许使用变量形式。hB5Cj];zU
mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接
R3bw/ZI};g6a mysql_connect($server, $db_user);查询数据库的代码：
T/i3tgm&J mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。
+T/_-Y^,xuAiCS $insert = mysql_db_query($database, "INSERT INTO useronline VALUES$Q ClE/TQ1p
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
'J KQNu 如果用户用错误信息的话，这样处理。
{#DoaiK{Adiu if(!($insert)) {
1N_ KI
p$ZT h+D print "Useronline Insert Failed > ";6aXc] `pr%M5e+L4c
}然后实现当超过设置的时间就删除该用户记录。ALa[s4L!i3Y
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。-hr L$Q%A6s3O
t;e
if(!($delete)) {
Y:dPSTS n print "Useronline Delete Failed > ";h5nt R\ \"T
}下面我们解决数据库中不同IP的问题
K_2|Y?V$C!cdu j $result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用h'[2l,N2u,k]\
mysql_num_rows(query);来统计用户，代码如下。
{0\0MirO+W $user = mysql_num_rows($result);最后关闭数据库。T T[W6A/~+H1s&@4E
mysql_close();显示在线的人数。
Wwl%~ r\ G T*o5G.W if($user == 1) {
z,f9Cp`.bw print("1 user online\n");:nZg]Wu/u+v
v
} else {Dz0b4Uw(I!Q K5N
print("$user users online\n");
;V1Ac!pW6D&P }最终把上面代码写成一个PHP文件如下。
%A|-s%j2t5U <?phpU!@)f?u1g,F&t
//Put your basic server info hereF3[nrgGX{
$server = "localhost"; //normally localhost
en}1Qsev;W/i $db_user = "root"; //your MySQL database usernamehc+tVP&ZM
m"R
$db_pass = "password"; //your MySQL database passwordZkB7]8y;`Y`
$database = "users";
H*|h!B!q"sUC&Q $timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably are
&HjQ/WJ/z2RV // offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last2?{-X
{@me/x
// $timeoutseconds seconds)
aG4pg-b-LZ?1w} //this is where PHP gets the time(`'Q:Dln
$timestamp = time();
dN$mRF$a Qd //counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed
`TDK&t1[bk $timeout = $timestamp-$timeoutseconds;
k/b%Unh*C-E6D //connect to databaseE0hef1g[oa k
mysql_connect($server, $db_user);/fI5@,kC.T,w
//add the timestamp from the user to the online list
lI v#Q
PX $insert = mysql_db_query($database, "INSERT INTO useronline VALUES9{g:?].xh3U
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
V }8bM1c*f if(!($insert)) {k nw*I1v)dbp
print "Useronline Insert Failed > ";
nC[v"j }
Q/tB4^Fijj,R //delete the peoples which haven't been online/active in the last $timeoutseconds seconds.
;jg-pcqU $delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");
w%s
X8J7nD.R6e if(!($delete)) {!m,ISz;ukk
print "Useronline Delete Failed > ";
4x?4ZY*?Y+\&w }
Ld;y&X9J //select the amount of people online, all uniques, which are online on THIS page
F G:W)a5eAXI $result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");

B-i:W
fUc#P if(!($result)) { rPM:H!r6TP
print "Useronline Select Error > ";
;p(l/FN:r^Q!?@,ECg }
J6I;e;r x"@ //Count the number of rows = the number of people onlinepT7x USp'WU[
$user = mysql_num_rows($result);
J'I#J(Z'Jq
e@:o //spit out the results?+SuM
D,O~
mysql_close();
%bLfU-I6t$B if($user == 1) {QL1`Ge,a8Qsp
print("1 user online\n");
oz)za&K#g#xD$M } else {)U-N:@ p[(h!B;`
print("$user users online\n");Tf8I4{#UqS$KRZ
}%t.QTaM
?>%s Z3[*WhDVK$~"P
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/v DU/AA:_k 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。IE7DmpQUa
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。
h)rwH-c'tZ\ 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。0d6n
lT`'`.Z5o
当然啦，这两款主机也是相当不错的。
9ATW4Q${.l&I.O D 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/uhl4Y I7S8[lfk
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L.h4U{%B8\Z*wC
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ACz
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