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！6O-Ns V1}m&@sbp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。
首先我创建MYSQL数据库表。r'`$M7B&z B
CREATE TABLE tablename (?(g o9TU
field type(max_length) DEFAULT 'default_value' (NOT) NULL S nz P'Z7P
}可以使用的SQL语句。Z i0ZBn(Y
CREATE TABLE useronline ([ `T,D(cNG?v
timestamp int(15) DEFAULT '0' NOT NULL,eZE E4f M
ip varchar(40) NOT NULL,
file varchar(100) NOT NULL,
PRIMARY KEY (timestamp),
KEY ip (ip),!o7~R#Y]+IB#_
KEY file (file)
);下面我们是PHP脚本，首先我定义MYSQL的信息。
$server = "localhost"; //你的服务器
$db_user = "root"; //你的mysql的用户名1XPt _1M
$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) j8f0\T"]4X t b n
$timeoutseconds = 300;取当前时间。n^/h)Q#T y)vQ b.d0g
$timestamp = time();上面的完整代码：0s zkx B(Y)F4S
<?phpeu `n5md9A B
$server = "localhost"; //your server7KMx ~p ZS
$db_user = "root"; //your mysql database username u NT;f6vn
$db_pass = "password"; //your mysql database password if any
$database = "users"; //the db nameY|}GCNm"Q/B K"q
$timeoutseconds = 300;//timeoutseconds limitp H\:Acs2u9Z k
//get the current time
$timestamp = time();
//calculate the lowest timestamp allowed6f0p"x|qj"H
$timeout = $timestamp-$timeoutseconds;
?>连接mysql
mysql_connect('localhost', 'username', 'password');也允许使用变量形式。
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：
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 VALUES6QYT+A9L.TC+I
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");D*j-kw X? i Wi
如果用户用错误信息的话，这样处理。 {H~*j\Uk!j |
if(!($insert)) {#GO?9l"l8npK
print "Useronline Insert Failed > ";
}然后实现当超过设置的时间就删除该用户记录。Z6GwL iZA
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。%y[xktb,h_$S |
if(!($delete)) {2Q:oViQ t8q}
print "Useronline Delete Failed > ";2H&O w qh6`6i:G*j ~
}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。!}Ir%G W1e]E
$user = mysql_num_rows($result);最后关闭数据库。
mysql_close();显示在线的人数。
if($user == 1) {T"w+M;r Nm6U l0u ]
print("1 user online\n");
} else {9L e!~7?S \4r&U5[
print("$user users online\n");
}最终把上面代码写成一个PHP文件如下。
<?php
//Put your basic server info here Bl&A ]F#r R
$server = "localhost"; //normally localhostf'P.Q fL"e
$db_user = "root"; //your MySQL database username(riP}A5C
$db_pass = "password"; //your MySQL database password"q1}7k,Z:K)[N o
$database = "users";6KBqfg.HNj6[
$timeoutseconds = 300; //it will delete all people which haven't refreshed(so probbably arerUxV1u6k
// offline or inactive) in $timieoutseconds time (so it actually checks the people that are active in the last tcy0|sj(y
// $timeoutseconds seconds)zEi.{J Z.I
//this is where PHP gets the time
$timestamp = time();[&t U+^3Q/@(hw$F8H
//counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed!s(}do|mM y
$timeout = $timestamp-$timeoutseconds;
//connect to database
mysql_connect($server, $db_user);
//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)) {V&X7Mi?|5F
print "Useronline Insert Failed > ";
}
//delete the peoples which haven't been online/active in the last $timeoutseconds seconds.8o$H'H O9JB
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");0`D5A4@a,[P7?
if(!($delete)) { isUd2r%K
print "Useronline Delete Failed > ";;U"BT,yn E:J4|
}
//select the amount of people online, all uniques, which are online on THIS pageP.F^1[ i } R
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");V2R Z'q W/P}#A
if(!($result)) {
print "Useronline Select Error > ";+g-@1|;fIq j\6?
}
//Count the number of rows = the number of people online
$user = mysql_num_rows($result);
//spit out the results
mysql_close();
if($user == 1) {J(SFs x6N(u9g
print("1 user online\n");
} else {#xCX o4t!WF$Sd4A
print("$user users online\n");0`"lS3O${1Y&s3}%K
}3gX~2E+zf1L$eOq"O
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