PHP实例教程:网南通服务器网,为中文网南通服务器网
可以使用的SQL语句。 Www^Spdns^com
以下为引用的内容: 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) ); |
Www~Spdns~com
下面我们开始使用PHP脚本,首先定义MYSQL的信息。 Spdns^com
$server = "localhost"; //你的服务器 Www_Spdns_com
$db_user = "root"; //你的mysql的用户名 中国南通服务器网
$db_pass = "password"; //你的mysql的密码 Spdns@com
$database = "users"; //表的名字 中.国.南通服务器网
设置统计的时间(多少秒内在线人数) 中.国.南通服务器网
$timeoutseconds = 300; Www@Spdns@com
取当前时间。 中国南通服务器网,为中文网南通服务器网
上面的完整代码: 中.国.南通服务器网
以下为引用的内容: $insert = mysql_db_query($database, "INSERT INTO useronline VALUES ('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')"); |
Www.Spdns.com
连接mysql 中国南通服务器网
mysql_connect('localhost', 'username', 'password'); [南通服务器网]
也允许使用变量形式。 Spdns_com
mysql_connect($server, $db_user, $db_pass); 中国.南通服务器网
如果mysql数据库没有密码的话可以使用下面代码连接(当然建议大家一定要设置好自己的密码,这样起码黑客得要解密啊) 中国.南通服务器网
mysql_connect($server, $db_user); Spdns_com
查询数据库的代码: Www^Spdns^com
mysql_db_query('database', 'query'); 中国南通服务器网
我们只要有访客就要增加一条记录。 南通服务器网
以下为引用的内容: $insert = mysql_db_query($database, "INSERT INTO useronline VALUES ('$timestamp','".$_SERVER['REMOTE_ADDR']."','".$_SERVER['PHP_SELF']."')"); |
Spdns~com
然后我们给出如果用户用错误信息的处理方式。 中国南通服务器网
以下为引用的内容: if(!($insert)) { print "Useronline Insert Failed > "; } |
南通服务器网
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。 Spdns^com
$delete = mysql_db_query($database, "DELETE FROM useronline WHERE timestamp<$timeout"); 中.国.南通服务器网
同样给出删除记录出错的处理。 中国.南通服务器网
以下为引用的内容: if(!($delete)) { print "Useronline Delete Failed > "; } |
中.国.南通服务器网
下面我们显示数据库中有多少个不同的IP 中国.南通服务器网
$result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' "); Spdns~com
我们使用 Www_Spdns_com
mysql_num_rows(query); 中国南通服务器网
来统计用户,代码如下。 Spdns
$user = mysql_num_rows($result); 中国南通服务器网,为中文网南通服务器网
以下为引用的内容: if($user == 1) { print("1 user online\n"); } else { print("$user users online\n"); } |
Spdns
最终把上面代码写成一个PHP文件如下。 Spdns.com
以下为引用的内容:
//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 probbably are // offline or inactive) in $timieoutseconds time (so it actually checks the people that 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 this timestamp, will get removed 中国.南通服务器网 $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 > "; } //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 page $result = mysql_db_query($database, "SELECT DISTINCT ip FROM useronline WHERE file='".$_SERVER['PHP_SELF']."' "); if(!($result)) { print "Useronline Select Error > "; } 中国.南通服务器网 //Count the number of rows = the number of people online $user = mysql_num_rows($result); //spit out the results mysql_close(); if($user == 1) { print("1 user online\n"); } else { print("$user users online\n"); } ?> 中国.南通服务器网
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