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。#xO&Q4^-`
首先我创建MYSQL数据库表。s$lGTos7G,?
CREATE TABLE tablename (
field type(max_length) DEFAULT 'default_value' (NOT) NULL&O)J)mP7D-O+b
}可以使用的SQL语句。
CREATE TABLE useronline ( tyGj$i5Y
timestamp int(15) DEFAULT '0' NOT NULL,i.J&VE*~@8e5k
ip varchar(40) NOT NULL,W:h_,ki2x'T Ti
file varchar(100) NOT NULL,*`CMt Q6m
PRIMARY KEY (timestamp),
KEY ip (ip),v y$WxK0bMH\
KEY file (file)nS_ h$\*^q&T
);下面我们是PHP脚本,首先我定义MYSQL的信息。
$server = "localhost"; //你的服务器y,zg%n2nf!sL(]
$db_user = "root"; //你的mysql的用户名
$db_pass = "password"; //你的mysql的密码K5vv7uD:s q ]-`
$database = "users"; //表的名字设置统计的时间(多少秒内在线人数);V6eH0Mf
$timeoutseconds = 300;取当前时间。m$Z"F)V[~+krc0s
$timestamp = time();上面的完整代码:/`dr2`Jdi
<?php{Y?2g6by
$server = "localhost"; //your serverzg0t`*oN&r
$db_user = "root"; //your mysql database usernamer%Q+m5~] C_
$db_pass = "password"; //your mysql database password if any3E`,w.lSmjq[[x
$database = "users"; //the db name
$timeoutseconds = 300;//timeoutseconds limitF2Oi9V!X8D
//get the current timeW%{6S3aNn
$timestamp = time();
//calculate the lowest timestamp allowedEJ$a#aZ x.{T;^,M(t
$timeout = $timestamp-$timeoutseconds;3qlV}l`
?>连接mysql IyNO@H%SN
mysql_connect('localhost', 'username', 'password');也允许使用变量形式。AR&yO6Ah(a8H
mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接8t(s0~c5t E a+U
mysql_connect($server, $db_user);查询数据库的代码:
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 VALUES
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
如果用户用错误信息的话,这样处理。 @c-wpcSN+H+Y
if(!($insert)) {3JXq|'a;u8X,o
print "Useronline Insert Failed > ";
}然后实现当超过设置的时间就删除该用户记录。a(y a2k!E*} ip
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。%Ia!kU$q&M[
if(!($delete)) { o2W o8cK}`%I
print "Useronline Delete Failed > ";+E6aMvay
}下面我们解决数据库中不同IP的问题
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用
mysql_num_rows(query);来统计用户,代码如下。
$user = mysql_num_rows($result);最后关闭数据库。cbH jD ji&?f T[
mysql_close();显示在线的人数。F^ R#F)[:~g
if($user == 1) {,] Y.KL2sP~
print("1 user online\n");
} else {ys6X:Yk h
print("$user users online\n"); lY)S3f,]
}最终把上面代码写成一个PHP文件如下。
<?phpZ,G l*N8PYn xp
//Put your basic server info here
$server = "localhost"; //normally localhost uw{5H0Om*VY&Y
$db_user = "root"; //your MySQL database usernameN~,_7?o,e
$db_pass = "password"; //your MySQL database password"y!H].B7n}w
$database = "users";
$timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably are
// offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last(W$i^4r0Jt$S8G
// $timeoutseconds seconds)
//this is where PHP gets the time
$timestamp = time();Vd2T,h`;RfV6{&h
//counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed
$timeout = $timestamp-$timeoutseconds;