<?php

  /* File: counter.php
   * Written by: Dennis Albregtse (dennis@albregtse.net)
   * Version: 0.3
   *
   * Features:
   * - Counts all hits
   * - Browser recognition
   * - Own frontend and use of variables on source site
   * - No need for a (mysql) database
   *
   * Installation instructions
   * - Place this file somewhere on your webserver
   * - include this file on every php file you wish to be counted. i.e. include("counter.php");
   * - make sure the directory where counter.php is placed is writable by the www user
   * - use on of the following variables to show the hits
   *   $hits : all hits
   *   $hits_ie: all hits by internet explorer
   *   $hits_ns: all hits by netscape or mozilla
   *   $hits_konq: all hits by konqueror
   *   $hits_opera: all hits by opera
   *   $hits_unk: all hist by an unknown browser
   *   ie, this is the line I use on my site echo $hits." Hits | ie: ".$hits_ie." | ns: ".$hits_ns." | Konq: ".$hits_konq." | op: ". $hits_opera." | unk: ".$hits_unk;
   * - To show the frontend point your browser to counter.php?action=view
   * - I'm sorry but the rest of the comments are in dutch...
   */
   
if (isset($action))
  {
   if($action == "view")
   {
     if($fp = @fopen("counter.txt", "r+"))
    {
      $numbers =Leesbestand($fp);
     
      $html = '<table>';
      $html .= '<tr><td>Hits:</td><td>'.$numbers[0].'</td></tr>';
      $html .= '<tr><td>Internet Explorer</td><td>'.$numbers[1].'</td></tr>';
      $html .= '<tr><td>Netscape</td><td>'.$numbers[2].'</td></tr>';
      $html .= '<tr><td>Konqueror</td><td>'.$numbers[3].'</td></tr>';
      $html .= '<tr><td>Opera</td><td>'.$numbers[4].'</td></tr>';
      $html .= '<tr><td>Onbekend</td><td>'.$numbers[5].'</td></tr>';
      $html .= '</table>';
      echo "$html";
    }
    else
    {
      $html = 'Kan file niet openen';
      echo "$html";
    }
  }
}  
else
{
  if($fp = @fopen("counter.txt", "r+"))
  {
    // File bestaat, dus lees de file en tel er 1 bij op
    $numbers= leesBestand($fp);
      
     /* Array ziet er als volgt uit:
     * plaats 0 hits
     * plaats 1 ie
     * plaats 2 ns
     * plaats 3 konq
     * plaats 4 opera
     * plaats 5 onbekend */
  
    $browser = checkBrowser();
    if ($browser == "ie")
    {
      $numbers[1] = $numbers[1] + 1;
    }
    elseif ($browser == "ns")
    {
      $numbers[2] = $numbers[2] + 1;
    }
    elseif ($browser == "konq")
    {
      $numbers[3] = $numbers[3] + 1;
    }
    elseif ($browser == "opera")
    {
      $numbers[4] = $numbers[4] + 1;
    }
    elseif ($browser == "onbekend")
    {
      $numbers[5] = $numbers[5] + 1;
    }
  
    // Tel 1 hit erbij
    $numbers[0] = $numbers[0] + 1;
    
    rewind($fp);
  
    $i = 0;
    while ($i <= 5) 
    {
      fwrite($fp, $numbers[$i]."\n");
      $i++;
    }
    // maak van de array begrijpbare variabelen zodat ze op de site gebruikt kunnen worden
    $hits = $numbers[0];
    $hits_ie = $numbers[1];
    $hits_ns = $numbers[2];
    $hits_konq = $numbers[3];
    $hits_opera = $numbers[4];
    $hits_unk = $numbers[5];
  }
  else
  {
    // File bestaat niet
    $fp = fopen("counter.txt", "w");
   
    // Vul array $numbers
    $i = 0;
    while ($i <= 5)
    {
      $numbers[$i] = 0;
      $i++;
    }
  
    $browser = checkBrowser();
    if ($browser == "ie")
    {
      $numbers[1] = 1;
    }
    elseif ($browser == "ns")
    {
      $numbers[2] = 1;
    }
    elseif ($browser == "konq")
    {
      $numbers[3] = 1;
    }
    elseif ($browser == "opera")
    {
      $numbers[4] = 1;
    }
    elseif ($browser == "onbekend")
    {
      $numbers[5] = 1;
    }
  
    // 1 hit er bij
    $numbers[0] = 1;
  
    $i = 0;
    while ($i <= 5) 
    {
      fwrite($fp, $numbers[$i]."\n");
      $i++;
    }
  }
}

function leesBestand($fp)
{
  $i = 0;
  while (!feof ($fp)) 
  {
    $count = fgets($fp,4096);
    $numbers[$i] = str_replace ("\n", "", $count);
    $i++;
  }
  return $numbers;
}

function checkBrowser()
{
  // Functie zoekt uit welke browser een surfer gebruikt
  $useragent = getenv("HTTP_USER_AGENT");
  if (preg_match ("/MSIE/i", $useragent))
  {
    // Internet exploder
    $browser = "ie";
    return $browser;
  }
  elseif (preg_match ("/Gecko/i", $useragent))
  {
    // Iets met een gecko engine waarschijnlijk Mozilla of netscape
    $browser = "ns";
    return $browser;
  }
  elseif (preg_match ("/Konqueror/i", $useragent))
  {
    // Konqueror
    $browser = "konq";
    return $browser;
  }
  elseif (preg_match ("/Opera/i", $useragent))
  {
    // Opera
    $browser = "opera";
    return $browser;
  }
  else 
  {
    // Onbekende browser
    $browser = "onbekend";
    return $browser;
  }
}
// Sluit file af
fclose($fp);
?>