PHP Classes Ex. #2: Multiple Select Field Objects

<?php
    $browsers = array('None', 'Firefox', 'Chrome', 'Internet Explorer', 'Safari', 'Opera', 'Other');
	$speeds = array('Unknown', 'DSL', 'T1', 'Cable', 'Dialup', 'Other');
	$os = array('Windows', 'Linux', 'Macintosh', 'Other');
	class Select {
		private $name;
		private $value;
		
		//Setter
		public function setName($name) {
			$this->name = $name;
		}
		public function setValue($value) {
			// is_array($value) ? 'Array' : 'not an Array';    OR
			if (!is_array($value)) {
				die ("Error: value is not an array.");
			}
			$this->value = $value;
		}
		
		//Getter
		public function getName() {
			return $this->name;
		}
		public function getValue() {
			return $this->value;
		}
		
		public function makeSelect() {
		echo "getName()."\">";
			$this->makeOptions($this->getValue());
		echo "";
		}
		public function makeOptions($val) {
			foreach($val as $va) {
				$this->options($va);
			}
		}
		public function options($v) {
			echo "".ucfirst($v)."";
		}
		public function __destruct() {
			//echo 'Object was just destroyed ';
		}
	}
	
	if( !isset($_POST['submit']) ) {
		echo "<h2>User Registration<br /></h2>";
		echo "<form action=\"test.php\" method=\"POST\">";
		echo "Name: <input type=\"text\" name=\"name\"  size=\"60\" /><br/>";
		echo "Username: <input type=\"text\" name=\"username\"  size=\"60\" /><br/>";
		echo "Email: <input type=\"text\" name=\"email\"  size=\"60\" /><br/>";
		echo "<p><strong>Work Access</strong></p>";
		echo "Primary Browser: ";
			$browser_work = new Select;
			$browser_work->setName('browser_work');
			$browser_work->setValue($browsers);
			$browser_work->makeSelect();
		echo "<br />Connection Speed: ";
			$speed_work = new Select;
			$speed_work->setName('speed_work');
			$speed_work->setValue($speeds);
			$speed_work->makeSelect();
		echo "<br />Operating System: ";
			$os_work = new Select;
			$os_work->setName('os_work');
			$os_work->setValue($os);
			$os_work->makeSelect();
		echo "<p><strong>Home Access</strong></p>";
		echo "Primary Browser: ";
			$browser_home = new Select;
			$browser_home->setName('browser_home');
			$browser_home->setValue($browsers);
			$browser_home->makeSelect();
		echo "<br />Connection Speed: ";
			$speed_home = new Select;
			$speed_home->setName('speed_home');
			$speed_home->setValue($speeds);
			$speed_home->makeSelect();
		echo "<br />Operating System: ";
			$ops_home = new Select;
			$ops_home->setName('os_home');
			$ops_home->setValue($os);
			$ops_home->makeSelect();
		echo "<br />";
		echo "</form>";
	} else {
		$input_local = array($_POST['name'], $_POST['username'], $_POST['email']);
		$work_access = array($_POST['browser_work'], $_POST['speed_work'], $_POST['os_work']);
		$home_access = array($_POST['browser_home'], $_POST['speed_home'], $_POST['os_home']);
		
		echo "<p>The following data has been saved for $input_local[0]: </p>\n";
		echo "<p>Username: $input_local[1]<br />\n";
		echo "Email: $input_local[2]</p>\n";
		
		echo "Work Access";
		echo "<ul>";
			foreach($work_access as $value) {
				echo "<li>".$value ."</li>";
			}
		echo "</ul>";
		echo "Hom Access";
		echo "<ul>";
			foreach($home_access as $value) {
				echo "<li>".$value ."</li>";
			}
		echo "</ul>";
	}
	?>

I've written everything from scratch while just following the instruction. Not a piece of code was borrowed from the solution script, so this baby is kinda unique. I've thrown a few CSS line to somewhat beautify the fields. Here's the complete code:

<?php
	$browserList=array('None','Firefox','Chrome','Internet Explorer','Safari','Opera','Other');
	$speedList=array('Unknown','DSL','T1','Cable','DialUp','Other');
	$osList=array('Windows','Linux','Macintosh','Others');
	
	class selections {
		public $selectionName;
		public $optionList;
		
		function __construct ($name, $optList){
			$this->selectionName=$name;
			$this->optionList=$optList;
		}		
		function setName($name){
			$this->selectionName=$name;
		}		
		function getName(){
			return $this->selectionName;
		}		
		function setValue($optList){
			if (is_array($optList))
			$this->optionList=$optList;
			else echo "<br/><em>Problem occured while pulling option list.</em><br/>";
		}
		function getValue(){
			return $this->optionList;
		}
		function createSelections(){
			echo "<select name=\"$this->selectionName\" multiple='yes' size='6'>";
			$this->createOptions($this->optionList);
			echo "</select>";
		}
		function createOptions($optList){		
			foreach($optList as $option){
				echo "<option value=\"$option\">".strtoupper($option)."</option>";
			}
		}	
	}
	
	function showSelected($keyWord){
		if (isset($_POST[("browser$keyWord")])) echo "<li>".$_POST[("browser$keyWord")]."</li>";
		if (isset($_POST[("speed$keyWord")])) echo "<li>".$_POST[("speed$keyWord")]."</li>";
		if (isset($_POST[("os$keyWord")])) echo "<li>".$_POST[("os$keyWord")]."</li>";
	}
?>
<html>
<head>
<title>Jose Palayen - PHP Ground Zero</title>
<style>
.selectBox {float: left; position: relative;}
.clearBox {clear: both;}
.userInfo {width: 250px;}
label {float: left;}
.userInfo input {float: right;}
</style>
</head>
<body>
	<?php		
		if (isset($_POST['nameReal']) && isset($_POST['nameUser']) && isset($_POST['email'])){
			echo "You entered this information: <br/>";
			echo "Name is: <em>".$_POST['nameReal']."</em><br/>";
			echo "UserName is: <em>".$_POST['nameUser']."</em><br/>";
			echo "email is: <em>".$_POST['email']."</em><br/>";
			//Show selection list
			echo "<br/> Work Internet Access Details:";
			echo "<ul>";
			showSelected("SelectWork");
			echo "</ul>";
			echo "<br/> Home Internet Access Details:";
			echo "<ul>";
			showSelected("SelectHome");
			echo "</ul>";
		}
		else {
		echo "Please Fill The Form: <br/>";	
		echo "<form action='{$_SERVER['PHP_SELF']}' method='POST'>";	
		echo "<div class='userInfo'>";
		echo"<label for='nr'>Name:</label><input name='nameReal' type='text' maxlength='30' id='nr'/> <br/>";
		echo"<label for='nu'>UserName:</label><input name='nameUser' type='text' maxlength='30' id='nu'/> <br/>";
		echo"<label for='mail'>Email:</label><input name='email' type='text' maxlength='100' id='mail'/> <br/>";
		echo"</div>";
			echo "<br/ class='clearBox'>Work Access:</em><br/>";
			echo "<div class='selectBox'>";
			echo " Primary Browser:";
			$selectField = new selections("browserSelectWork", $GLOBALS['browserList']);
			$selectField->createSelections();			
			unset($selectField);
			echo "</div>";
			echo "<div class='selectBox'>";
			echo " Speed:<br/>";
			$selectField = new selections("speedSelectWork", $GLOBALS['speedList']);
			$selectField->createSelections();
			unset($selectField);
			echo "</div>";
			echo "<div class='selectBox'>";
			echo " OS:<br/>";
			$selectField = new selections("osSelectWork", $GLOBALS['osList']);
			$selectField->createSelections();
			unset($selectField);
			echo"</div>";
			
			echo "<br/ class='clearBox'>Home Access:";			
			echo "<div class='selectBox'>";
			echo " Primary Browser:";
			$selectField = new selections("browserSelectHome", $GLOBALS['browserList']);
			$selectField->createSelections();
			unset($selectField);
			echo "</div>";
			echo "<div class='selectBox'>";
			echo " Speed:<br/>";
			$selectField = new selections("speedSelectHome", $GLOBALS['speedList']);
			$selectField->createSelections();
			unset($selectField);
			echo "</div>";
			echo "<div class='selectBox'>";
			echo " OS:<br/>";
			$selectField = new selections("osSelectHome", $GLOBALS['osList']);
			$selectField->createSelections();
			unset($selectField);
			echo "</div>";
			echo "<br/ class='clearBox'>";
		echo "</form>";}
	?>
</body>
</html>

First of all I am new in developing and this site rocks!!! I would like someone to explain why using the unset function after every list.Is there any reason why do I have to destroy the variables? Aren't they being destroyed every time someone fills the form?