crear calendario desde una fecha inicio una final

[chalchis]

tengo este script que genera del mes actual

Código PHP:

<?php
//This gets today's date 
$date =time () ;  //This puts the day, month, and year in seperate variables  
$day = date('d', $date) ;  
$month = date('m', $date) ;  
$year = date('Y', $date) ;  
//Here we generate the first day of the month  
$first_day = mktime(0,0,0,$month, 1, $year) ;   //This gets us the month name  
$title = date('F', $first_day) ; 
$day_of_week = date('D', $first_day) ; 
switch($day_of_week)
{  
    case "Sun": $blank = 0; 
    break;  
    case "Mon": $blank = 1; 
    break;  
    case "Tue": $blank = 2; 
    break;  
    case "Wed": $blank = 3; 
    break;  
    case "Thu": $blank = 4; 
    break;  
    case "Fri": $blank = 5; 
    break;  
    case "Sat": $blank = 6;
     break;  
}  //We then determine how many days are in the current month 
$days_in_month = cal_days_in_month(0, $month, $year) ; 
 
echo "<table border=1 width=294>"; 
echo "<tr><th colspan=7> $title $year </th></tr>"; 
echo "<tr><td width=42>S</td><td width=42>M</td><td width=42>T</td><td width=42>W</td><td width=42>T</td><td width=42>F</td><td width=42>S</td></tr>";  //This counts the days in the week, up to 7 
$day_count = 1;  
echo "<tr>"; //first we take care of those blank days 
while($blank > 0 )  
{  
    echo "<td>-</td>";  $blank = $blank-1;  
    $day_count++; 
} 
 
$day_num = 1;  //count up the days, untill we've done all of them in the month 
while ( $day_num <= $days_in_month )  
{  
    echo "<td>".$day_num."*</td>"; 
 
    
    $day_num++;  $day_count++;  //Make sure we start a new row every week 
    if ($day_count > 7) 
    { 
        echo "</tr><tr>"; $day_count = 1; 
    } 
} 
 
//Finaly we finish out the table with some blank details if needed 
while ( $day_count >1 && $day_count <=7 )  
{  
    echo "<td>-</td>";  $day_count++;  
}  
echo "</tr></table>"; 
?>
 

mi pregunta es como puedo generar mas filas y columnas si en caso de que la fecha termino llegara hasta el siguiente mes por ejmplo dia:5 del siguiete mes

como podria aumentar la caudricula hasta llegar esa fecha tope


saludos espero sus comentarios

gracias