Blätterbarer Kalender mit PHP und JavaScript

 31 )
{
  $day = 31;
}
 
// Aktueller Monat
$month = intval( $get_date[1] );
if( $month < 10 && strlen( $month ) < 2 )
{
  $month = '0'. $month;
}
if( $month > 12 )
{
  $month = 12;
}
 
// Name des aktuellen Monats
$month_name_array = array(
  $lang['general']['jan'],
  $lang['general']['feb'],
  $lang['general']['mar'],
  $lang['general']['apr'],
  $lang['general']['may'],
  $lang['general']['jun'],
  $lang['general']['jul'],
  $lang['general']['aug'],
  $lang['general']['sept'],
  $lang['general']['oct'],
  $lang['general']['nov'],
  $lang['general']['dec']);
$month_name = $month_name_array[$month-1];
 
// Aktuelles Jahr
$year = date('Y');
if( isset( $get_date[0] ) && $get_date[0] != '' )
{
  $year = intval( $get_date[0] );
}
 
// Vorheriger Monat
$prev_month = intval( $month - 1 );
if( $prev_month == 0 )
{
  $prev_month = 12;
}
else
{
  if( $prev_month < 10 && strlen( $prev_month ) < 2 )
  {
    $prev_month = '0'. $prev_month;
  }
}
 
// Vorheriges Jahr
$prev_year  = intval( $year - 1 );
 
// Naechster Monat
$next_month = intval( $month + 1 );
if( $next_month < 1 )
{
  $next_month = 12;
}
elseif( $next_month > 12 )
{
  $next_month = '01';
}
else
{
  if( $next_month < 10 && strlen( $next_month ) < 2 )
  {
    $next_month = '0'. $next_month;
  }
}
 
// Naechstes Jahr
$next_year  = intval( $year + 1 );
 
// Anzahl der Tage des aktuellen Monats
$current_month_days = date("t", mktime(0, 0, 0, $month, $day, $year));
 
// Anzahl der Tage des vergangenen Monats
$prev_month_days = date("t", mktime(0, 0, 0, $prev_month, $day, $year));
 
// Erster Tag des aktuellen Monats
$current_month_1st_day = date("w", mktime(0, 0, 0, $month, 1, $year));
 
// Anzahl der Tage des Vormonats bis zum ersten Tag dieses Monats
if( $current_month_1st_day == 0 )
{
  $skip_days = 6;
}
else
{
  if( $current_month_1st_day != 1 )
  {
    $skip_days = ( $current_month_1st_day - 1 );
  }
  else
  {
    $skip_days = 0;
  }
}
 
// Anzahl der vollen Wochen und verbleibenden Tage des aktuellen Monats
if( $skip_days != 0 )
{
  $full_weeks = floor( ( $current_month_days - ( 7 - $skip_days ) ) / 7 );
  $days_remaining = ( $current_month_days - ( $full_weeks * 7 ) - ( 7 - $skip_days ) );
}
else
{
  $full_weeks = floor( ( $current_month_days ) / 7 );
  $days_remaining = ( $current_month_days - ( $full_weeks * 7 ) );
}
 
?>
 
<div id="datepicker_popup">
 
<div>
    <a class="close" href="javascript:close_calendar();"></a>
 
<table border="0" cellspacing="0">
<tbody>
<tr class="options">
<td class="prev_month"><a href="javascript:open_calendar('&lt;?php if( $month == '01' ) { echo $prev_year; } else { echo $year; } ?&gt;-&lt;?php echo $prev_month; ?&gt;-01');">&lt;&lt;</a></td>
<td class="center" colspan="5"></td>
<td class="next_month"><a href="javascript:open_calendar('&lt;?php if( $month == 12 ) { echo $next_year; } else { echo $year; } ?&gt;-&lt;?php echo $next_month; ?&gt;-01');">&gt;&gt;</a></td>
</tr>
<tr>
<th>Mo</th>
<th>Di</th>
<th>Mi</th>
<th>Do</th>
<th>Fr</th>
<th>Sa</th>
<th>So</th>
</tr>
<tr>
<span><a href="javascript:insert_date(\''. $year .'\', \''. $month .'\', \''. $day .'\');">'. $prev_month_days_tmp .'</a></span>
 
'."\n";
    }
    else
    {
      $counter_new = $counter - $skip_days;
 
      $day = $counter_new;
      if( strlen( $counter_new ) &lt; 2 )
      {
        $day = '0'. $counter_new;
      }
 
      $class_day = '';
      $table_end = "\n";
      if( $i == 6 )
      {
        $class_day = ' saturday';
      }
      elseif( $i == 7 )
      {
        $class_day = ' sunday';
        $table_end = '</tr>
<tr>'."\n";
      }
 
      echo '
<td class="current'. $class_day .'"><span><a href="javascript:insert_date(\''. $year .'\', \''. $month .'\', \''. $day .'\');">'. $counter_new .'</a></span></td>
'. $table_end;
    }
  }
}
 
$counter = ( $counter_new + 1 );
$counter_tmp = ( $full_weeks * 7 + $counter - 1);
 
$rise = 0;
for( $i = $counter; $i &lt;= $counter_tmp; $i++ )
{
  $day = $i;
  if( strlen( $i ) &lt; 2 )
  {
    $day = '0'. $i;
  }
 
  $rise++;
  if( ( $i - $counter + 1 ) % 7 == 0 )
  {
    echo '
<td class="current sunday"><span><a href="javascript:insert_date(\''. $year .'\', \''. $month .'\', \''. $day .'\');">'. $i .'</a></span></td>
</tr>
<tr>'."\n";
    $rise = 0;
  }
  elseif( $rise == 6 )
  {
    echo '
<td class="current saturday"><span><a href="javascript:insert_date(\''. $year .'\', \''. $month .'\', \''. $day .'\');">'. $i .'</a></span></td>
'."\n";
  }
  else
  {
    echo '
<td class="current"><span><a href="javascript:insert_date(\''. $year .'\', \''. $month .'\', \''. $day .'\');">'. $i .'</a></span></td>
'."\n";
  }
}
 
if( $days_remaining &gt; 0 )
{
  $count_up = 0;
  for( $n = 1; $n &lt;= 7; $n++  )
  {
    if( $n &lt;= $days_remaining )
    {
      $day = $i;
      if( strlen( $i ) &lt; 2 )
      {
        $day = '0'. $i;
      }
 
      $class_day = '';
      if( $n == 6 )
      {
        $class_day = ' saturday';
      }
      echo '
<td class="current'. $class_day .'"><span><a href="javascript:insert_date(\''. $year .'\', \''. $month .'\', \''. $day .'\');">'. $i .'</a></span></td>
'."\n";
      $i++;
    }
    else
    {
      $count_up++;
 
      $day = $count_up;
      if( strlen( $count_up ) &lt; 2 )
      {
        $day = '0'. $count_up;
      }
 
      $class_day = '';
      if( $n == 6 )
      {
        $class_day = ' saturday';
 
      }
      elseif( $n == 7 )
      {
        $class_day = ' sunday';
      }
 
      echo '
<td class="gray'. $class_day .'"><span><a href="javascript:insert_date(\''. $year .'\', \''. $month .'\', \''. $day .'\');">'. $count_up .'</a></span></td>
'."\n";
    }
  }
}
 
?&gt;</tr>
</tbody></table>
</div>
 
</div>