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Saturday, January 28, 2012

[snippet] Users Currently Online

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Database Name:    active_sessions 

            ip        session        date 
        +--------+-----------+---------+ 
NULL    |  NO  |    YES    |  YES  | 
        +--------+-----------+---------+ 
DEFAULT |        |    NULL  |  NULL  | 
        +--------+-----------+---------+ 
        
<?php 
session_start(); 
include"db.php"; # Connect To the database 
$active_sessions = 0; 
$minutes = 5; # period considered active 
if($sid = session_id()) # if there is an active session 
{ 
    # DB connect here 
    $ip = $_SERVER['REMOTE_ADDR']; # Get Users IP address 
    # Delete users from the table if time is greater than $minutes 
    mysql_query("DELETE FROM `active_sessions` WHERE  
    `date` < DATE_SUB(NOW(),INTERVAL $minutes MINUTE)")or die(mysql_error());  
     
    # Check to see if the current ip is in the table 
    $sql = mysql_query("SELECT * FROM active_sessions WHERE ip='$ip'"); 
    $row = mysql_fetch_array($sql); 
    # If the ip isn't in the table add it. 
    if(!$row){ 
        mysql_query("INSERT INTO `active_sessions` (`ip`, `session`, `date`)  
        VALUES ('$ip', '$sid', NOW()) ON DUPLICATE KEY UPDATE `date` = NOW()")or die(mysql_error()); 
    } 
    # Get all the session in the table 
    $sessions = mysql_query('SELECT * FROM `active_sessions`')or die(mysql_error()); 
    # Add up all the rows returned 
    $active_sessions = mysql_num_rows($sessions); } 
    # Print the final result 
    echo'<b>Online Now: </b>'.$active_sessions; ?> 

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