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！m3G#uATK5?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。/N T B(J#k ?rDN`
CREATE TABLE tablename (5}n i2d p/_ i(JI1Z
field type(max_length) DEFAULT 'default_value' (NOT) NULL7`Xt2H;L6a.y2Y*z
}可以使用的SQL语句。
CREATE TABLE useronline (
timestamp int(15) DEFAULT '0' NOT NULL,
ip varchar(40) NOT NULL,
file varchar(100) NOT NULL,
PRIMARY KEY (timestamp),9B c c [3B
KEY ip (ip),
KEY file (file)
);下面我们是PHP脚本，首先我定义MYSQL的信息。w [wZA z^"K
$server = "localhost"; //你的服务器
$db_user = "root"; //你的mysql的用户名N6l[R T?
$db_pass = "password"; //你的mysql的密码 F$l6A'^3` i W*D2V1mE;N
$database = "users"; //表的名字设置统计的时间(多少秒内在线人数) t^c ?,h e
$timeoutseconds = 300;取当前时间。
$timestamp = time();上面的完整代码：
<?phpn ^8oO8@ V
$server = "localhost"; //your server kU4P1f X!P
$db_user = "root"; //your mysql database username]:W$ry/e
$db_pass = "password"; //your mysql database password if any
$database = "users"; //the db name
$timeoutseconds = 300;//timeoutseconds limit
//get the current time
$timestamp = time();GC3T gTd1s
//calculate the lowest timestamp allowed8K.^![O _:P
$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, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接$b3`9H3@7U
mysql_connect($server, $db_user);查询数据库的代码：)h"s'I,~ T J
mysql_db_query('database', 'query');我们只要有访客就要增加一条记录。 z;oM C.O+Q3sj_ R
$insert = mysql_db_query($database, "INSERT INTO useronline VALUES
('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')");
如果用户用错误信息的话，这样处理。*y W ` f3}7n7mk
if(!($insert)) {
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<$timeout");同样给出删除记录出错的处理。
if(!($delete)) {*Qt b1v&hwn @_
print "Useronline Delete Failed > ";B-WP.Cg9Q
}下面我们解决数据库中不同IP的问题7g[X%n~
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");使用8VkWB%qxt+p$syST
mysql_num_rows(query);来统计用户，代码如下。9J#ty @'`%a-sG/z
$user = mysql_num_rows($result);最后关闭数据库。
mysql_close();显示在线的人数。
if($user == 1) {T*V lX i0g3wxi
print("1 user online\n");#y4a@&_6[ jq
} else {[g4d$JA`!~
print("$user users online\n");
}最终把上面代码写成一个PHP文件如下。/BeKy ~ ka;x6i
<?php5j ja)y h8ues2B
//Put your basic server info here}+E9Y_k xT
$server = "localhost"; //normally localhost
$db_user = "root"; //your MySQL database username
$db_pass = "password"; //your MySQL database password#X7G"J2h-P/`J
$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)_;jB;qvdi]
//this is where PHP gets the time
$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 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)) {
print "Useronline Insert Failed > ";MB \IAJOB
}
//delete the peoples which haven't been online/active in the last $timeoutseconds seconds.o!L0_j H
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout");$ZC8O k:w VE3O Y
if(!($delete)) {l.kr6f(RSH
print "Useronline Delete Failed > ";
} |D Z@}c E q J7x&U
//select the amount of people online, all uniques, which are online on THIS page&i-p:S$~H0f?/v
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' ");
if(!($result)) {
print "Useronline Select Error > ";$b;]#rb$q@
}
//Count the number of rows = the number of people onlineH7xG1}GOK^BhpR L
$user = mysql_num_rows($result);
//spit out the results
mysql_close();/C,o5d+@j m
if($user == 1) {
print("1 user online\n"); R$O3^2\4@k%E3z
} else {,o-c]k @ Hw
print("$user users online\n");HP&]!zD rb
}
?>
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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。_UF0t)Ma4w Z
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自己加QQ去问吧。
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