Buongiorno
Ho bisogno di un altro aiuto. vorrei capire perchè in questo calendario il mese di dicembre, ossia l'ultimo mese dell'anno è indicato nella barra degli indirizzi con numero 13 anzichè 12, di conseguenza anche novembre che anzichè essere 11 è 12, ottobre 11 anzichè 10 ecc.. e gennaio, il primo mese dell'anno è segnato come il numero 2 anzichè 1. come devo fare per sistemare meglio questo script in modo tale che i mesi vengano numerati correttamente?

Codice PHP:
<?   
require_once("includes/config.php");  

if(!isset(
$installed))  
{  
    
header("Location: install.php");  
    exit;  
}  
else  
{  
    if(
file_exists('install.php'))  
    {  
        
header("Location: install.php");  
        exit;  
    }  
}  

$db_connection mysql_connect ($DBHost$DBUser$DBPass) OR die (mysql_error());    
$db_select mysql_select_db ($DBName) or die (mysql_error());  
$db_table $TBL_PR "events";  

function 
getmicrotime(){   
    list(
$usec$sec) = explode(" ",microtime());   
    return ((float)
$usec + (float)$sec);   
}   

$time_start getmicrotime();  

IF(!isset(
$_GET['year'])){  
    
$_GET['year'] = date("Y");  
}  
IF(!isset(
$_GET['month'])){  
    
$_GET['month'] = date("n")+1;  
}  

$month addslashes($_GET['month'] - 1);  
$year addslashes($_GET['year']);  

$query "SELECT event_id,event_title,event_day,event_time FROM $db_table WHERE event_month='$month' AND event_year='$year' ORDER BY event_time";  
$query_result mysql_query ($query);  
while (
$info mysql_fetch_array($query_result))  
{  
    
$day $info['event_day'];  
    
$event_id $info['event_id'];  
    
$events[$day][] = $info['event_id'];  
    
$event_info[$event_id]['0'] = substr($info['event_title'], 012);;  
    
$event_info[$event_id]['1'] = $info['event_time'];  
}  

$todays_date date("j");  
$todays_month date("n");  

$days_in_month date ("t"mktime(0,0,0,$_GET['month'],0,$_GET['year']));  
$first_day_of_month date ("w"mktime(0,0,0,$_GET['month']-1,1,$_GET['year']));  
$first_day_of_month $first_day_of_month 1;  
$count_boxes 0;  
$days_so_far 0;  

IF(
$_GET['month'] == 13){  
    
$next_month 2;  
    
$next_year $_GET['year'] + 1;  
} ELSE {  
    
$next_month $_GET['month'] + 1;  
    
$next_year $_GET['year'];  
}  

IF(
$_GET['month'] == 2){  
    
$prev_month 13;  
    
$prev_year $_GET['year'] - 1;  
} ELSE {  
    
$prev_month $_GET['month'] - 1;  
    
$prev_year $_GET['year'];  
}  


?>  
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">  
<html>  
<head>  
<title>PHPCalendar</title>  
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">  
<link href="images/cal.css" rel="stylesheet" type="text/css">  
<script language="JavaScript" type="text/JavaScript">  
<!--  
function MM_jumpMenu(targ,selObj,restore){ //v3.0  
  eval(targ+".location='"+selObj.options[selObj.selectedIndex].value+"'");  
  if (restore) selObj.selectedIndex=0;  
}  
function MM_openBrWindow(theURL,winName,features) { //v2.0  
  window.open(theURL,winName,features);  
}  
//-->  
</script>  
</head>  

<body>  
<div align="center"><span class="currentdate"><? echo date ("F Y"mktime(0,0,0,$_GET['month']-1,1,$_GET['year'])); ?></span>
  
</div>  
<div align="center">
  
  <table width="700" border="0" cellspacing="0" cellpadding="0">  
    <tr>   
      <td><div align="right">[url="<? echo "]">[img]http://images-1.findicons.com/files/icons/1688/web_blog/48/arrow_left.png[/img][/url]</div></td>  
      
<td width="200" style="border: 1px solid #F2F2F2"><div align="center">  
              
          <
select name="month" id="month" onChange="MM_jumpMenu('parent',this,0)">  
            <?  
            for (
$i 1$i <= 12$i++) {  
                
$link $i+1;  
                IF(
$_GET['month'] == $link){  
                    
$selected "selected";  
                } ELSE {  
                    
$selected "";  
                }  
                echo 
"<option value=\"index.php?month=$link&year=$_GET[year]\" $selected>" date ("F"mktime(0,0,0,$i,1,$_GET['year'])) . "</option>\n";  
            }  
            
?>  
          </select>  
          <select name="year" id="year" onChange="MM_jumpMenu('parent',this,0)">  
          <?  
          
for ($i 2009$i <= 2015$i++) {  
              IF(
$i == $_GET['year']){  
                
$selected "selected";  
            } ELSE {  
                
$selected "";  
            }  
              echo 
"<option value=\"index.php?month=$_GET[month]&year=$i\" $selected>$i</option>\n";  
          }  
          
?>  
          </select>  
        </div></td>  
      <td><div align="left">[url="<? echo "]">[img]http://images-2.findicons.com/files/icons/1688/web_blog/48/arrow_right.png[/img][/url]</div></td>  
    
</tr>  
  </
table>  
  
  
</
div>  
<
table width="1050" border="0" align="center" cellpadding="0" cellspacing="0">  
  <
tr>  
    <
td><table border="0" width="100%" cellpadding="0" cellspacing="1" bgcolor="#DDDDDD">  
        <
tr class="topdays">   
          <
td><div align="center">Domenica</font></div></td>  
          <
td><div align="center">Lunedì</div></td>  
          <
td><div align="center">Martedì</div></td>  
          <
td><div align="center">Mercoledì</div></td>  
          <
td><div align="center">Giovedì</div></td>  
          <
td><div align="center">Venerdì</div></td>  
          <
td><div align="center">Sabato</div></td>  
        </
tr>  
        <
tr valign="top" bgcolor="#FFFFFF">   
        <?  
        for (
$i 1$i <= $first_day_of_month-1$i++) {  
            
$days_so_far $days_so_far 1;  
            
$count_boxes $count_boxes 1;  
            echo 
"<td width=\"100\" height=\"100\" class=\"beforedayboxes\"></td>\n";  
        }  
        for (
$i 1$i <= $days_in_month$i++) {  
               
$days_so_far $days_so_far 1;  
                
$count_boxes $count_boxes 1;  
            IF(
$_GET['month'] == $todays_month+1){  
                IF(
$i == $todays_date){  
                    
$class "highlighteddayboxes";  
                } ELSE {  
                    
$class "dayboxes";  
                }  
            } ELSE {  
                IF(
$i == 1){  
                    
$class "highlighteddayboxes";  
                } ELSE {  
                    
$class "dayboxes";  
                }  
            }  
            echo 
"<td width=\"100\" height=\"100\" class=\"$class\">\n";  
            
$link_month $_GET['month'] - 1;  
            echo 
"<div align=\"right\"><span class=\"toprightnumber\">\n<a style=\"color: #222222\"  href=\"java-script:MM_openBrWindow('event_add.php?day=$i&month=$link_month&year=$_GET[year]','','width=500,height=300');\">$i</a></span></div>\n";  
            IF(isset(
$events[$i])){  
                echo 
"<div align=\"center\"><span class=\"eventinbox\">\n";  
                while (list(
$key$value) = each ($events[$i])) {  
                    echo 
"
<table class=\"corner\"><tr><td><a href=\"java-script:MM_openBrWindow('event.php?id=
$value','','width=500,height=200');\" style=\"color: #3D3D3D; font-size: 13px; text-decoration: none; text-shadow: 0px 1px 1px #FFF;\">" $event_info[$value]['1'] . " - " $event_info[$value]['0']  . "</a></td></tr></table>\n
\n"
;  
                }  
                echo 
"</span></div>\n";  
            }  
            echo 
"</td>\n";  
            IF((
$count_boxes == 7) AND ($days_so_far != (($first_day_of_month-1) + $days_in_month))){  
                
$count_boxes 0;  
                echo 
"</TR><TR valign=\"top\">\n";  
            }  
        }  
        
$extra_boxes $count_boxes;  
        for (
$i 1$i <= $extra_boxes$i++) {  
            echo 
"<td width=\"100\" height=\"100\" class=\"afterdayboxes\"></td>\n";  
        }  
        
$time_end getmicrotime();  
        
$time round($time_end $time_start3);  
        
?>  
        </tr>  
      </table></td>  
  </tr>  
</table>  
</body>  
</html>
snapshot per farvi capire:http://img508.imageshack.us/img508/6063/calendariob.png