Set more variables to URL

[Earliboy]

Well okay, i made some changes and the problem is may the overgiving of the URL.
Yes, i messed the code a littlebit up but i get my outputs that tells me that everything should be allright.

	$newURL = $_SERVER["REQUEST_URI"];
	echo $newURL;
	
	$_GET['limit_rows'] = 500;

Sets the actualy URL and output it, also sets the limit rows to 500 (to test)
Output:

/echelon/clientdetails.php?id=2

next parts:

	$newURL .= "&limit_rows=".$_GET['limit_rows'];
	
	echo $newURL;
	echo "<br>";
	
	if(isset($_GET['limit_rows']))
	{
		$newURL .= "&limit_rows=".$_GET['limit_rows'];

		echo isset($newURL) ? htmlspecialchars($newURL) : '';
	}

Outputs:

/echelon/clientdetails.php?id=2&limit_rows=500
/echelon/clientdetails.php?id=2&limit_rows=500&limit_rows=500

Even the second line works fine if i set it manually to the url.

Actually Form:

	<center>
		<h5>Enter number of lines you want to see.</h5>
		<!--<form action="<?//=$_SERVER["REQUEST_URI"]?>" method="get">-->
		<form action="<?php $newURL ?>" method="get">
			<input type="text" name="limit_rows" value="<?php echo $limit_rows?>" onblur="if(this.value == ''){ this.value = '<?php echo $limit_rows?>'; }" onfocus="if(this.value == '<?php echo $limit_rows?>'){ this.value = '';}" />
				<br/>
			<input type="submit" value="Refresh" />
		</form>
	</center>
	<br>

So the URL is fine, the overgive of the URL should be fine, the old one should output the same. Idk whats wrong at here, i still get redirected to clients.php if i click on the refresh button.

Any ideas?

And btw, I'm working now 3 hours on this error ^^