Variables, classes, methods, functions, LOST!

[ppowell]

The following class is supposed to produce a series of HTML dropdowns and HTML text fields based solely upon variable names for month, day and year passed into it. Those variable names will correspond to actual variables with values that are passed into the preSelect() function inside the methods (that function is called from an outside parent script included). However, upon careful inspection the global function does not globalize anything within any method.

Can someone look at this and tell me what I did wrong?

Thanx
Phil

// USE THIS CLASS TO GENERATE A SERIES OF DROPDOWNS AND TEXT FIELDS PERTAINING TO MONTH / DAY / YEAR
class DropdownGenerator {
var $hasMonth, $hasDay, $hasYear,
$monthVar, $dayVar, $yearVar,
$yearFieldLength,
$monthArray;

function DropdownGenerator($monthVar = '', $dayVar = '', $yearVar = '', $yearFieldLength = 4) {		

	$this->yearFieldLength = $yearFieldLength;
	foreach (array('month', 'day', 'year') as $key => $val) {
	 $this->{$val . 'Var'} = ${$val . 'Var'};
	 $this->{'has' . ucfirst($val)} = (strlen($this->{$val . 'Var'}) > 0) ? 1 : 0;
	 if (strlen($this->{$val . 'Var'}) > 0) global ${$this->{$val . 'Var'}};
	}

	$this->monthArray = array('01' => 'January',
				  '02' => 'February',
				  '03' => 'March',
				  '04' => 'April',
				  '05' => 'May',
				  '06' => 'June',
				  '07' => 'July',
				  '08' => 'August',
				  '09' => 'September',
				  '10' => 'October',
				  '11' => 'November',
				  '12' => 'December'
				 );

}

function getMonthDropdown() { // STRING "METHOD" TO PRODUCE MONTH DROPDOWN
 global ${$this->monthVar};	 

 if (!$this->hasMonth) return '';
 $html = $this->monthVar . ' = ' . ${$this->monthVar} . '<select size="1" name="' . $this->monthVar . '">';
 foreach ($this->monthArray as $key => $val) 
  $html .= '<option value="' . $key  . '"' . preSelect(${$this->monthVar}, $key) . '>' . $key . ' - ' . $val . '</option>';
 $html .= '</select>';
 return $html;
}

function getDayDropdown() { // STRING "METHOD" TO PRODUCE DAY DROPDOWN
 global ${$this->dayVar};

 if (!$this->hasDay) return '';
 $html = '<select size="1" name="' . $this->dayVar . '">';
 for ($i = 1; $i <= 31; $i++) {
  $myDay = ($i < 10) ? '0' . $i : $i;
  $html .= '<option value="' . $myDay . '"' . preSelect(${$this->dayVar}, $myDay) . '>' . $myDay . '</option>';
 }
     $html .= '</select>';
 return $html;
}

function getYearText() { // STRING "METHOD" TO PRODUCE YEAR TEXT FIELD
 global ${$this->yearVar};

 if (!$this->hasYear) return '';
 $html = '<input type="text" name="' . $this->yearVar . '" value="' . ${$this->yearVar} . '" size="' . $this->yearFieldLength . '">';
 return $html;
}

}