Forskel p� ++i og i++?

Tue, 21 Feb 2012 19:25:04 GMT

Hejsa

Jeg er stadig ny i programmerings verdenen og er igang med at l�re c++.

Jeg har set rundt omkring, og selv afpr�vet, at det ikke har nogen funktionel forskel hvis man skriver ++i fremfor i++.

Men har det nogen effektiv forskel? Er ens program en lille bitte smule hurtigere hvis der st�r ++ f�rst? Hvilket jo er meget effektivt hvis det er et program som g�r brug af denne funktion meget.

Er der andre lignende sm� ting som man kan �ndre som g�r ens program hurtigere?

avanceret php/mysql counter

Fri, 30 Dec 2011 16:28:08 GMT

Nu synes jeg selv, at jeg har s�gt nettet tyndt for den helt rigtige php-counter, som passer n�jagtig til mine behov. Det er desv�rre flere �r siden jeg selv har arbejdet med php/mysql, s� jeg er pt. ikke i stand til at kode den selv. Jeg har dog fundet frem til en udm�rket counter, som kan ses p� min side her: passionate.dk.

Den t�ller unikke hits for i dag, i g�r, i ugen, m�neden, �ret og i alt, samt hvor mange der er online. Jeg har egentlig 2 �nsker, til at f� den til at v�re pr�cis til mit behov. Jeg ville gerne have en ekstra funktion, der talte alle hits, dvs. hver gang man opdatere, t�ller den +1 g�ldende for alle. Udover det ville jeg ogs� gerne have, at koden blev adskildt p� den m�de, at statistikkerne g�lder for hele passionate.dk, men at tallene ikke bliver vist p� selve siden, men derimod kun p� en anden privat side, s� tallene ikke er offentlige.

Koden til den nuv�rende counter kan ses her:

PHP kode

 <?
 // edit counter settings here
 
 
 // database configuration
 $counter_host = "localhost";
 $counter_user = "username";
 $counter_password = "password";
 $counter_database = "database";
 
 // http path to the folder containing counter.php and counter.gif (do not forget the / at the end)
 // set http://www.your-homepage.com/ when the counter is in root dir
 $counter_path_http = "http://www.website.com/counter/";
 
 // ip-protection in seconds
 $counter_expire = 600;
 
 
 
 // do not edit from here
 
 // connect to database
 $counter_connected = true;
 $link = @mysql_connect($counter_host, $counter_user, $counter_password);
 if (!$link) 
 {
      // can't connect to database
     $counter_connected = false;
     echo "Counter: " . mysql_error();
 }
 else
 {
     // select database
     $db_selected = @mysql_select_db($counter_database, $link);
     if (!$db_selected) 
     {
         // can't select database
         $counter_connected = false;
         echo "Counter: " . mysql_error();
     }
 }
 
 if ($counter_connected == true) 
 {
    $ignore = false; 
    
    // get counter information
    $sql = "select * from counter_values";
    $res = mysql_query($sql);
    
    // fill when empty
    if (mysql_num_rows($res) == 0)
    {      
       $sql = "INSERT INTO `counter_values` (`id`, `day_id`, `day_value`, `yesterday_id`, `yesterday_value`, `week_id`, `week_value`, `month_id`, `month_value`, `year_id`, `year_value`, `all_value`, `record_date`, `record_value`) VALUES ('1', '" . date("z") . "',  '1', '" . (date("z")-1) . "', '0', '" . date("W") . "', '1', '" . date("n") . "', '1', '" . date("Y") . "',  '1',  '1',  NOW(),  '1')";
       mysql_query($sql);
 
       $sql = "select * from counter_values";
       $res = mysql_query($sql);
       
       $ignore = true;
    }   
    $row = mysql_fetch_assoc($res);
    
    $day_id = $row['day_id'];
    $day_value = $row['day_value'];
    $yesterday_id = $row['yesterday_id'];
    $yesterday_value = $row['yesterday_value'];
    $week_id = $row['week_id'];
    $week_value = $row['week_value'];
    $month_id = $row['month_id'];
    $month_value = $row['month_value'];
    $year_id = $row['year_id'];
    $year_value = $row['year_value'];
    $all_value = $row['all_value'];
    $record_date = $row['record_date'];
    $record_value = $row['record_value'];
    
    $counter_agent = (isset($_SERVER['HTTP_USER_AGENT'])) ? addslashes(trim($_SERVER['HTTP_USER_AGENT'])) : "";
    $counter_time = time();
    $counter_ip = trim(addslashes($_SERVER['REMOTE_ADDR'])); 
    
    // ignorore some bots
    if (substr_count($counter_agent, "bot") > 0)
       $ignore = true;
       
    // delete free ips
    if ($ignore == false)
    {
       $sql = "delete from counter_ips where unix_timestamp(NOW())-unix_timestamp(visit) > $counter_expire"; 
       mysql_query($sql);
    }
       
    // check for entry
    if ($ignore == false)
    {
       $sql = "select * from counter_ips where ip = '$counter_ip'";
       $res = mysql_query($sql);
       if (mysql_num_rows($res) == 0)
       {
          // insert
          $sql = "INSERT INTO counter_ips (ip, visit) VALUES ('$counter_ip', NOW())";
             mysql_query($sql);
       }
       else
       {
          $ignore = true;
          $sql = "update counter_ips set visit = NOW() where ip = '$counter_ip'";
          mysql_query($sql);
       }
    }
    
    // online?
    $sql = "select * from counter_ips";
    $res = mysql_query($sql);
    $online = mysql_num_rows($res);
       
    // add counter
    if ($ignore == false)
    {           
       // yesterday
       if ($day_id == (date("z")-1)) 
       {
          $yesterday_value = $day_value; 
          $yesterday_id = (date("z")-1);
       }
       else
       {
          if ($yesterday_id != (date("z")-1))
          {
             $yesterday_value = 0; 
             $yesterday_id = date("z")-1;
          }
       }
       
       // day
       if ($day_id == date("z")) 
       {
          $day_value++; 
       }
       else 
       {
          $day_value = 1;
          $day_id = date("z");
       }
       
       // week
       if ($week_id == date("W")) 
       {
          $week_value++; 
       }
       else 
       { 
          $week_value = 1;
          $week_id = date("W");
       }
       
       // month
       if ($month_id == date("n")) 
       {
          $month_value++; 
       }
       else 
       {
          $month_value = 1;
          $month_id = date("n");
       }
       
       // year
       if ($year_id == date("Y")) 
       {
          $year_value++; 
       }
       else 
       {
          $year_value = 1;
          $year_id = date("Y");
       }
       
       // all
       $all_value++;
          
       // neuer record?
       if ($day_value > $record_value)
       {
          $record_value = $day_value;
          $record_date = date("Y-m-d H:i:s");
       }
          
       // speichern und aufräumen
       $sql = "update counter_values set day_id = '$day_id', day_value = '$day_value', yesterday_id = '$yesterday_id', yesterday_value = '$yesterday_value', week_id = '$week_id', week_value = '$week_value', month_id = '$month_id', month_value = '$month_value', year_id = '$year_id', year_value = '$year_value', all_value = '$all_value', record_date = '$record_date', record_value = '$record_value' where id = 1";
       mysql_query($sql);  
    }      
 ?>
 <table cellpadding="1" cellspacing="0" style="border:1px solid #000000">
   <tr> 
     <td width="150">
       <b><font face="Arial, Helvetica, sans-serif" size="2"><a href="http://www.compredia.eu/" target="_blank"><img src="<? echo $counter_path_http; ?>counter.gif" alt="Ad" width="16" height="16" border="0" /></a> Visitor Statistics</font></b>
     </td>
   </tr>
   <tr> 
     <td style="border-top:1px solid #000000"> 
       <font face="Arial, Helvetica, sans-serif" size="1">
       &raquo; <? echo $online; ?> Online<br />
       &raquo; <? echo $day_value; ?> Today<br />
       &raquo; <? echo $yesterday_value; ?> Yesterday<br />
       &raquo; <? echo $week_value; ?> Week<br />
       &raquo; <? echo $month_value; ?> Month<br />
       &raquo; <? echo $year_value; ?> Year<br />
       &raquo; <? echo $all_value; ?> Total
       </font>
     </td>
   </tr> 
   <tr> 
     <td style="border-top:1px solid #000000" width="150" align="center">
       <font face="Arial, Helvetica, sans-serif" size="1">
       Record: <? echo $record_value; ?> (<? echo date("d.m.Y", strtotime($record_date)) ?>)<br />
       (<a href="http://www.free-php-couter.com/mysql-counter.php" target="_blank">Free MySQL Counter</a>)
       </font>
     </td>
   </tr> 
 </table>
 <?
 }
 ?>

P� forh�nd mange tak.

Mvh.

Martin

Udvikleren.dk - Seneste [counter] forum tr�de

Forskel p� ++i og i++?

avanceret php/mysql counter