ineedtutorials.com » visitors online http://www.ineedtutorials.com Information made easy Thu, 14 May 2009 15:17:16 +0000 en hourly 1 http://wordpress.org/?v=3.0.1 how many visitors online – PHP tutorial http://www.ineedtutorials.com/code/php/how-many-visitors-online-php-tutorial http://www.ineedtutorials.com/code/php/how-many-visitors-online-php-tutorial#comments Thu, 20 Dec 2007 19:58:25 +0000 Gertjan http://www.ineedtutorials.com/articles/how-many-visitors-online-php-tutorial Ever wonderd how to display how many visitors you have online. In this tutorial i will show you an easy but effective way to display the amount of online visitor’s.

The database table used by the tutorial

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CREATE TABLE `counter` (
  `id` int(10) unsigned NOT NULL auto_increment,
  `ip` varchar(100) NOT NULL,
  `lastvisit` varchar(100) NOT NULL,
  PRIMARY KEY  (`id`)
);

Next we will be creating a class VisitorCounter:

The variable session time in min is the amount of time has to pass before the script will clear the visitor from the counter.

** The script only clears the visitor if he has not taken any action for sessionTimeInMin amount of time.

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  <?php
class VisitorCounter {
 
	var $sessionTimeInMin = 5;
}
?>

Step2: Creating the class contructor

The contructor will clean the database for timed out visitor’s and add/ update visitor’s.

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 public  function VisitorCounter()
      {
          $ip = $_SERVER['REMOTE_ADDR'];
          $this->cleanVisitors();
 
        if ($this->visitorExists($ip))
          {
              $this->updateVisitor($ip);
          } else
          {
              $this->addVisitor($ip);
          }
      }

Step 3: Creating the cleanVisitors() function:

This function will clear all visitor’s from the database that were inactive for x amount of time.

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private  function cleanVisitors()
      {
 
          $sql = "select * from counter";
          $res = mysql_query($sql);
          while ($row = mysql_fetch_array($res))
          {
              if (time() - $row['lastvisit'] >= $this->sessionTimeInMin * 60)
              {
                  $dsql = "delete from counter where id = $row[id]";
                  mysql_query($dsql);
              }
          }
      }

Step4: Creating the visitorExists function:

This function will check if the given visitor is already in the database, if he’s not the function will return false.

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 public function visitorExists($ip)
    {
        $sql = "select * from counter where ip = '$ip'";
        $res = mysql_query($sql);
        if (mysql_num_rows($res) > 0)
        {
            return true;
        } else
            if (mysql_num_rows($res) == 0)
            {
                return false;
            }
    }

Step5: creating the updateVisitor function:

This function will update the visitor if he’s in the database.

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private  function updateVisitor($ip)
    {
 
        $sql = "update counter set lastvisit = '" . time() . "' where ip = '$ip'";
        mysql_query($sql);
    }

Step6: creating the addVisitor function:

This function will add the visitor if he’s not yet in the database.

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 private  function addVisitor($ip)
    {
        $sql = "insert into counter (ip ,lastvisit) value('$ip', '" . time() . "')";
        mysql_query($sql);
    }

Step7: getAmountVisitors() function:

This function will return the amount of visitor’s in the database (online at the site).

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 public  function getAmountVisitors()
    {
        $sql = "select count(id) from counter";
        $res = mysql_query($sql);
        $row = mysql_fetch_row($res);
        return $row[0];
    }

Step8: show() function:

This function will display the actual counter how many online visitors on the webpage.

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  public function show()
    {
        echo '<div style="padding:5px; margin:auto; background-color:#fff"><b>' .
            $this->getAmountVisitors() . 'visitors online</b></div>';
    }

file: class.visitorcounter.inc.php

The complete how many visitor’s class:

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 <?php
class VisitorCounter
{
	var $sessionTimeInMin = 5; // time session will live, in minutes
 
  public  function VisitorCounter()
    {
        $ip = $_SERVER['REMOTE_ADDR'];
        $this->cleanVisitors();
 
        if ($this->visitorExists($ip))
        {
            $this->updateVisitor($ip);
        } else
        {
            $this->addVisitor($ip);
        }
 
 
    }
 
   public function visitorExists($ip)
    {
        $sql = "select * from counter where ip = '$ip'";
        $res = mysql_query($sql);
        if (mysql_num_rows($res) > 0)
        {
            return true;
        } else
            if (mysql_num_rows($res) == 0)
            {
                return false;
            }
    }
 
  private  function cleanVisitors()
    {
        $sessionTime = 30;
        $sql = "select * from counter";
        $res = mysql_query($sql);
        while ($row = mysql_fetch_array($res))
        {
            if (time() - $row['lastvisit'] >= $this->sessionTimeInMin * 60)
            {
                $dsql = "delete from counter where id = $row[id]";
                mysql_query($dsql);
            }
        }
    }
 
 
  private  function updateVisitor($ip)
    {
 
        $sql = "update counter set lastvisit = '" . time() . "' where ip = '$ip'";
        mysql_query($sql);
    }
 
 
  private  function addVisitor($ip)
    {
        $sql = "insert into counter (ip ,lastvisit) value('$ip', '" . time() . "')";
        mysql_query($sql);
    }
 
  public  function getAmountVisitors()
    {
 
        $sql = "select count(id) from counter";
        $res = mysql_query($sql);
        $row = mysql_fetch_row($res);
        return $row[0];
    }
 
 
   public function show()
    {
 
        echo '<div style="padding:5px; margin:auto; background-color:#fff"><b>' .
            $this->getAmountVisitors() . 'visitors online</b></div>';
 
    }
 
}
?>

Impleting the how many visitor’s counter on your website:

Now we can easily add this counter to our website using only 3 lines of code.

** Don’t forget to include the connection to the database !!

file: dbconnect.inc.php

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<?php
define("HOST", "localhost");
// Database user
define("DBUSER", "");
// Database password
define("PASS", "");
// Database name
define("DB", "");
 
############## Make the mysql connection ###########
$conn = mysql_connect(HOST, DBUSER, PASS);
if (!$conn)
{
    // the connection failed so quit the script
    die('Could not connect !<br />Please contact the site\'s administrator.');
}
$db = mysql_select_db(DB);
if (!$db)
{
    // cannot connect to the database so quit the script
    die('Could not connect to database !<br />Please contact the site\'s administrator.');
}
?>

Now let’s include the visitor counter into the mainpage:

file: index.php

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<?php
 require "dbconnect.inc.php"; // db connection
 require "class.visitorcounter.inc.php"; // the counter class itself
 $counter = new VisitorCounter; // make a new counter
//content here
$counter->show(); // show the counter
// and here
?>
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