What is a loop?

function duedates($programStartDate, $month, $request) {
    if ($request == "accelarate")
    {
     $weakcycle = '2';
    }
    else if ($request == "deaccelerate")
    {
     $weakcycle = '4';
    }
    else
    {
     $weakcycle = '4';
    }
    $db = new databasemanager();
    $unixtime = strtotime($programStartDate);

    switch($month)
    {
     case'2':
     $date[] = calculateenddate(1,$weakcycle,7,$unixtime);
     break;
     case'3':
     $date[] = calculateenddate(1,$weakcycle,7,$unixtime);
     $date[] = calculateenddate(2,$weakcycle,7,$unixtime);
     break;
     case'4':
     $date[] = calculateenddate(1,$weakcycle,7,$unixtime);
     $date[] = calculateenddate(2,$weakcycle,7,$unixtime);
     $date[] = calculateenddate(3,$weakcycle,7,$unixtime);
     break;
     case '5':
     $date[] = calculateenddate(1,$weakcycle,7,$unixtime);
     $date[] = calculateenddate(2,$weakcycle,7,$unixtime);
     $date[] = calculateenddate(3,$weakcycle,7,$unixtime);
     $date[] = calculateenddate(4,$weakcycle,7,$unixtime);
     break;
     case '6':
     $date[] = calculateenddate(1,$weakcycle,7,$unixtime);
     $date[] = calculateenddate(2,$weakcycle,7,$unixtime);
     $date[] = calculateenddate(3,$weakcycle,7,$unixtime);
     $date[] = calculateenddate(4,$weakcycle,7,$unixtime);
     $date[] = calculateenddate(5,$weakcycle,7,$unixtime);
     break;
     case '7':
     $date[] = calculateenddate(1,$weakcycle,7,$unixtime);
     $date[] = calculateenddate(2,$weakcycle,7,$unixtime);
     $date[] = calculateenddate(3,$weakcycle,7,$unixtime);
     $date[] = calculateenddate(4,$weakcycle,7,$unixtime);
     $date[] = calculateenddate(5,$weakcycle,7,$unixtime);
     $date[] = calculateenddate(6,$weakcycle,7,$unixtime);
     break;
     case '8':
     $date[] = calculateenddate(1,$weakcycle,7,$unixtime);
     $date[] = calculateenddate(2,$weakcycle,7,$unixtime);
     $date[] = calculateenddate(3,$weakcycle,7,$unixtime);
     $date[] = calculateenddate(4,$weakcycle,7,$unixtime);
     $date[] = calculateenddate(5,$weakcycle,7,$unixtime);
     $date[] = calculateenddate(6,$weakcycle,7,$unixtime);
     $date[] = calculateenddate(7,$weakcycle,7,$unixtime);
     break;
     case '9':
     $date[] = calculateenddate(1,$weakcycle,7,$unixtime);
     $date[] = calculateenddate(2,$weakcycle,7,$unixtime);
     $date[] = calculateenddate(3,$weakcycle,7,$unixtime);
     $date[] = calculateenddate(4,$weakcycle,7,$unixtime);
     $date[] = calculateenddate(5,$weakcycle,7,$unixtime);
     $date[] = calculateenddate(6,$weakcycle,7,$unixtime);
     $date[] = calculateenddate(7,$weakcycle,7,$unixtime);
     $date[] = calculateenddate(8,$weakcycle,7,$unixtime);
     break;
     case '10':
     $date[] = calculateenddate(1,$weakcycle,7,$unixtime);
     $date[] = calculateenddate(2,$weakcycle,7,$unixtime);
     $date[] = calculateenddate(3,$weakcycle,7,$unixtime);
     $date[] = calculateenddate(4,$weakcycle,7,$unixtime);
     $date[] = calculateenddate(5,$weakcycle,7,$unixtime);
     $date[] = calculateenddate(6,$weakcycle,7,$unixtime);
     $date[] = calculateenddate(7,$weakcycle,7,$unixtime);
     $date[] = calculateenddate(8,$weakcycle,7,$unixtime);
     $date[] = calculateenddate(9,$weakcycle,7,$unixtime);
     break;
     case '11':
     $date[] = calculateenddate(1,$weakcycle,7,$unixtime);
     $date[] = calculateenddate(2,$weakcycle,7,$unixtime);
     $date[] = calculateenddate(3,$weakcycle,7,$unixtime);
     $date[] = calculateenddate(4,$weakcycle,7,$unixtime);
     $date[] = calculateenddate(5,$weakcycle,7,$unixtime);
     $date[] = calculateenddate(6,$weakcycle,7,$unixtime);
     $date[] = calculateenddate(7,$weakcycle,7,$unixtime);
     $date[] = calculateenddate(8,$weakcycle,7,$unixtime);
     $date[] = calculateenddate(9,$weakcycle,7,$unixtime);
     $date[] = calculateenddate(10,$weakcycle,7,$unixtime);
     break;
     case '12':
     $date[] = calculateenddate(1,$weakcycle,7,$unixtime);
     $date[] = calculateenddate(2,$weakcycle,7,$unixtime);
     $date[] = calculateenddate(3,$weakcycle,7,$unixtime);
     $date[] = calculateenddate(4,$weakcycle,7,$unixtime);
     $date[] = calculateenddate(5,$weakcycle,7,$unixtime);
     $date[] = calculateenddate(6,$weakcycle,7,$unixtime);
     $date[] = calculateenddate(7,$weakcycle,7,$unixtime);
     $date[] = calculateenddate(8,$weakcycle,7,$unixtime);
     $date[] = calculateenddate(9,$weakcycle,7,$unixtime);
     $date[] = calculateenddate(10,$weakcycle,7,$unixtime);
     $date[] = calculateenddate(11,$weakcycle,7,$unixtime);
     break;
    }
    return $date;
  }

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