Calendar script

[sonicfusion]

<?php
$month = 10;
$year = 2006;

$date = mktime(12,0,0,$month,1,$year);

//number of days
$dnd = date('t', $date);
//start day
$dsd = date('w', $date);
$days = array('Mon','Tue','Wed','Thu','Fri','Sat','Sun');

echo '<h1>'.date('F Y', $date).'</h1>';
echo '<table>';
echo '<tr>';
foreach($days as $day){
  echo '<th>'.$day.'</th>';
}
echo '</tr>';
$tr = 0;
//offset
for($i = $dsd-1; $i > 0; $i--){
  if($tr == 0){
    echo '<tr>';
  }
  $tr++;
  //offset cell
  echo '<td>&nbsp;</td>';
  if($tr == 7){
    echo '</tr>';
    $tr = 0;
  }
}
//days
for($i = $dnd; $i > 0; $i--){
  if($tr == 0){
    echo '<tr>';
  }
  $tr++;
  //day number
  $dn++;
  echo '<td>'.$dn.'</td>';
  if($tr == 7){
    echo '</tr>';
    $tr = 0;
  }
}
//fill
for($i = $tr; $i < 7; $i++){
  if($tr == 0){
    echo '<tr>';
  }
  $tr++;
  //fill cell
  echo '<td>&nbsp;</td>';
  if($tr == 7){
    echo '</tr>';
  }
}
echo '</table>';
?>

Please let me know of anyway to improve this script and why your method is better. I am very keen to improve my coding.

Thank you all in advance.

[rikmoncur]

There's an error in this code but thanks to forum user Shrike for fixing it:
$dsd = date('w', $date);
should be:
$dsd = date('N', $date);