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！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。2{;R/Y7c [6GFI3Y
首先我创建MYSQL数据库表。 u$T Aiv lW
CREATE TABLE tablename (
field type(max_length) DEFAULT 'default_value' (NOT) NULL
}可以使用的SQL语句。
CREATE TABLE useronline ( Hd*O;Z%eAC
timestamp int(15) DEFAULT '0' NOT NULL,
ip varchar(40) NOT NULL,
file varchar(100) NOT NULL,
PRIMARY KEY (timestamp),s [)^?,p*F u
KEY ip (ip),
KEY file (file)xvUv}jJ2x
);下面我们是PHP脚本，首先我定义MYSQL的信息。
$server = "localhost"; //你的服务器X-N@ MO"{i6|#E
$db_user = "root"; //你的mysql的用户名
$db_pass = "password"; //你的mysql的密码
$database = "users"; //表的名字设置统计的时间(多少秒内在线人数)s'J0L0V0dj
$timeoutseconds = 300;取当前时间。c(i6g4cnn9E S:Z OF},\
$timestamp = time();上面的完整代码：
<?php
$server = "localhost"; //your serverS*|?g UIY
$db_user = "root"; //your mysql database usernameR x5kWVb ^
$db_pass = "password"; //your mysql database password if any
$database = "users"; //the db name.V y tGd yj
$timeoutseconds = 300;//timeoutseconds limit(G"c`&U ? H-dvN!E
//get the current time6La z.fI
$timestamp = time();
//calculate the lowest timestamp allowedJ+x3j~ n` L1r
$timeout = $timestamp-$timeoutseconds;&_hCBc*x
?>连接mysqly Z ?p FneB;Jot
mysql_connect('localhost', 'username', 'password');也允许使用变量形式。5q bZ/Tm-a:]m
mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接
mysql_connect($server, $db_user);查询数据库的代码：!PX6RW0@ p2w#U
mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES8{_H"i5Wv;J)?9b
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
如果用户用错误信息的话，这样处理。 [R7rtW
if(!($insert)) {'q IF,P-_!h{y
print "Useronline Insert Failed > ";
}然后实现当超过设置的时间就删除该用户记录。
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。p"U @(p4qI
if(!($delete)) {
print "Useronline Delete Failed > ";
}下面我们解决数据库中不同IP的问题 G7m X*Kb$U^
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用ll C T/L
mysql_num_rows(query);来统计用户，代码如下。W y6~,m&{
$user = mysql_num_rows($result);最后关闭数据库。
mysql_close();显示在线的人数。
if($user == 1) {
print("1 user online\n");
} else {
print("$user users online\n");
}最终把上面代码写成一个PHP文件如下。t:O)u5Fg8r#h
<?php+y]{|)L/_)E:A
//Put your basic server info here `3r)yT0zg Gm9C
$server = "localhost"; //normally localhostz$[q5AF [
$db_user = "root"; //your MySQL database username
$db_pass = "password"; //your MySQL database password)r1`0|1gp
$database = "users"; SA;X%xHT3Ob R
$timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably are Lx Xe#K[(~2?@W
// offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last0C/l:z0SZ)uV
// $timeoutseconds seconds)
//this is where PHP gets the time#h B PO U0Sc%a
$timestamp = time();
//counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed ] K4v#m&EI7|h4D `
$timeout = $timestamp-$timeoutseconds;
//connect to databaseeB _BHah#l
mysql_connect($server, $db_user); i fs:Zm;[
//add the timestamp from the user to the online list
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
if(!($insert)) { lFw$H%G0d g
print "Useronline Insert Failed > ";
} ^ bDK[+y4f,bP{
//delete the peoples which haven't been online/active in the last $timeoutseconds seconds.
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout"); EY}!{)E w
if(!($delete)) {FE y:{8Hc ~
print "Useronline Delete Failed > ";
}
//select the amount of people online, all uniques, which are online on THIS page
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");
if(!($result)) {
print "Useronline Select Error > ";
}
//Count the number of rows = the number of people online{| m4i/H'} |
$user = mysql_num_rows($result);
//spit out the results
mysql_close();
if($user == 1) { I;kLl.zK`*w8r
print("1 user online\n");
} else {
print("$user users online\n");
} w e K.boq*p
?>
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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。v2g [XG
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。
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。 p H@2m/oE
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自己加QQ去问吧。
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