PHP+MYSQL实例
PHP实例教程：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。首先是创建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。CREATE TABLE useronline (timestamp int(15) DEFAULT '0' NOT NULL,ip varchar(40) NOT NULL,file varchar(100) NOT NULL,PRIMARY KEY (timestamp),KEY ip (ip),KEY file (file));下面我们开始使用PHP脚本，首先定义MYSQL的信息。$server = "localhost"; //你的服务器$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)$timeoutseconds = 300;取当前时间。$timestamp = time();上面的完整代码：<?php$server = "localhost"; //your server$db_user = "root"; //your mysql database username$db_pass = "password"; //your mysql database password if any$database = "users"; //the db name$timeoutseconds = 300;//timeoutseconds limit//get the current time$timestamp = time();//calculate the lowest timestamp allowed$timeout = $timestamp-$timeoutseconds;?>连接mysqlmysql_connect('localhost', 'username', 'password');也允许使用变量形式。mysql_connect($server, $db_user, $db_pass);如果mysql数据库没有密码的话可以使用下面代码连接（当然建议大家一定要设置好自己的密码，
这样起码黑客得要解密啊）mysql_connect($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']."')");然后我们给出如果用户用错误信息的处理方式。if(!($insert)) {print "Useronline Insert Failed > ";}然后我们得实现当超过我们设置的时间我们就要删除该用户记录。$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(!($delete)) {print "Useronline Delete Failed > ";}下面我们显示数据库中有多少个不同的IP$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='"
.$_SERVER['PHP_SELF']."' ");我们使用mysql_num_rows(query);来统计用户，代码如下。$user = mysql_num_rows($result);最后我们要关闭数据库。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。<?php//Put your basic server info here$server = "localhost"; //normally localhost$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 probbab
ly are// offline or inactive) in $timieoutseconds time (so it actually checks the people th
at are active in the last// $timeoutseconds seconds)//this is where PHP gets the time$timestamp = time();//counts the timeout, all people which have been seen last online in earlier than thi
s timestamp, will get removed$timeout = $timestamp-$timeoutseconds;//connect to databasemysql_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 > ";}//delete the peoples which haven't been online/active in the last $timeoutseconds sec
onds.$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout"
);if(!($delete)) {print "Useronline Delete Failed > ";}//select the amount of people online, all uniques, which are online on THIS page$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='"
.$_SERVER['PHP_SELF']."' ");if(!($result)) {print "Useronline Select Error > ";}//Count the number of rows = the number of people online$user = mysql_num_rows($result);//spit out the resultsmysql_close();if($user == 1) {print("1 user online\n");} else {print("$user users online\n");}?> 很使用！不错 收藏一下 谢谢楼主分享 不错我在找写php资料
不过太乱了这 真的很實用 架設網站需要用到
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