Untitled

<html>

<head>
	<title>Title</title>
</head>

<body>
	<?php
	$q = $_SERVER['QUERY_STRING'];
	?>

	<form action="?<?php echo $_SERVER['QUERY_STRING']?>" method="GET">

		<select name="num">
			<option value="1">One</option>
			<option value="2">Two</option>
			<option value="3">Three</option>
		</select>
		<input type="submit" name="submit" id="submit" value="Go" />

		<?php if(isset($_GET['location'])): ?>
			<input type="text" name="location" value="<?php echo $_GET['location']?>" />
		<?php endif ?>
		<br />
		<?php
		foreach($_GET as $k => $v){
			echo "label: ".$k." and value: ".$v."<br />";
		}

		?>
	</form>
</body>
</html>