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！3VU oL1f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。
CREATE TABLE tablename (
field type(max_length) DEFAULT 'default_value' (NOT) NULL
}可以使用的SQL语句。+]Vnuf1o@
CREATE TABLE useronline (8q*D0P8Z%F4d
timestamp int(15) DEFAULT '0' NOT NULL,#ODr)r-A
ip varchar(40) NOT NULL,
file varchar(100) NOT NULL,aSg l*vX(~.K0a
PRIMARY KEY (timestamp),t+r [G2n%vS(F:i b
KEY ip (ip),
KEY file (file) ?4q7|O,A!i5tx
);下面我们是PHP脚本，首先我定义MYSQL的信息。U4g%{ UZON
$server = "localhost"; //你的服务器m#l A S.Qk
$db_user = "root"; //你的mysql的用户名
$db_pass = "password"; //你的mysql的密码6W/P Sz*C:Fd2x
$database = "users"; //表的名字设置统计的时间(多少秒内在线人数)b6o]0E`.y
$timeoutseconds = 300;取当前时间。2@i ye~D4U/ZK
$timestamp = time();上面的完整代码：~na` jB
<?php2^7o/Py3a:@rP*a
$server = "localhost"; //your server
$db_user = "root"; //your mysql database username4BS6HX3zvA
$db_pass = "password"; //your mysql database password if any
$database = "users"; //the db name
$timeoutseconds = 300;//timeoutseconds limit|0Tdn8BF+}
//get the current time(R vR0x4M
$timestamp = time();
//calculate the lowest timestamp allowed@j*g0[A/J
$timeout = $timestamp-$timeoutseconds;0g&Nv"z-U3N cKD
?>连接mysql
mysql_connect('localhost', 'username', 'password');也允许使用变量形式。2z0[\,o)UB5M"`1{9Y)w
mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接HO*D1X8Y-c^-J
mysql_connect($server, $db_user);查询数据库的代码：.eDu1my d
mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。M him.u PW
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES k$[me z/^8IR
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");b pq oS,yV&Q3|
如果用户用错误信息的话，这样处理。
if(!($insert)) {
print "Useronline Insert Failed > ";z*a:p-q6G a0@
}然后实现当超过设置的时间就删除该用户记录。3n gn+Ce/coHI9N
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");同样给出删除记录出错的处理。U(U p-D a/J6i
if(!($delete)) {
print "Useronline Delete Failed > "; EKZ;?iT
}下面我们解决数据库中不同IP的问题m6^n ?O-|
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用'X]3{ x"x^9L
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。8E/]D*B9h#k
mysql_close();显示在线的人数。
if($user == 1) {9W j)m O C S7K9c
print("1 user online\n");
} else {
print("$user users online\n");
}最终把上面代码写成一个PHP文件如下。T:F |#I_ Q9m
<?php ql k Wa o
//Put your basic server info herejN$g-{5fx
$server = "localhost"; //normally localhostBJ(W?y
$db_user = "root"; //your MySQL database username
$db_pass = "password"; //your MySQL database password
$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
// $timeoutseconds seconds)&a@Brd"y*|KW
//this is where PHP gets the timef.nV&|+v#N
$timestamp = time();
//counts the timeout, all people which have been seen last online in earlier than this timestamp, will get removed
$timeout = $timestamp-$timeoutseconds;
//connect to databasel^;F @.S_"|,T%E)a
mysql_connect($server, $db_user);
//add the timestamp from the user to the online listO ]_ ||&y
$insert = mysql_db_query($database, "INSERT INTO useronline VALUESh U!eR&{0^lcd
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
if(!($insert)) { h2h6X5I:IOt!mU V
print "Useronline Insert Failed > "; O1vmC` h
}
//delete the peoples which haven't been online/active in the last $timeoutseconds seconds.
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");
if(!($delete)) {
print "Useronline Delete Failed > ";
}
//select the amount of people online, all uniques, which are online on THIS pageQ+A:B/oT2\5R9o#NX
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");:RyiZ;j|#\/e
if(!($result)) {
print "Useronline Select Error > ";~ lo R hpd\
}
//Count the number of rows = the number of people online
$user = mysql_num_rows($result);3cqJ+e6}:ui Xd
//spit out the results
mysql_close();
if($user == 1) {:O ltu[ j"I
print("1 user online\n");'yZX:|U1J4d;q
} else {e%B5T*]+w
print("$user users online\n");"_;Q,k#R'~-_
}
?>L@9Q8Jom0J 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。
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。
当然啦，这两款主机也是相当不错的。
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自己加QQ去问吧。
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