struggling with $_POST

Hello, I am having a hard time getting a value sent to via POST.

I have a PHP code which outputs this HTML:

Please select your preferred ADMIN AREA language:
	<!-- beginning of admin language selector drop down menu //-->
		<form action="/?p=menuedit" method="post">
			<script type="text/javascript">var url_full = "/?p=menuedit";</script>
			<img src="/images/flags_iso/24/us.png" style="position:relative;top:7px;" />
			<select name="l_admin" OnChange="this.form.submit();window.location.href=url_full;">
				<option value="en" selected>English</option>
				<option value="it">Italiano</option>
			</select>
		</form>
	<!-- end of admin language selector drop down menu //-->

HTML:

I also tried using just <form action="" method="post"> or even just <form method="post">.

This form resides on the page /?p=menuedit (I am actually generating that part of the HTML with this PHP):

echo '<form action="/?'.$_SERVER['QUERY_STRING'].'" method="post">'; 

PHP:

At the top of the page, for the sake of testing it, I put:

echo $_POST['l_admin']; 

PHP:

But every time I submit the form I get:

Notice: Undefined index: l_admin in /home2/memory/public_html/globals.inc.php on line 26

Code (markup):

In other words, somehow it seems like my form is not submitting the post values... Can somebody help me figure out what I am doing wrong?

Thanks a lot

 

remove these 2 lines from your code and it will work.

1. <script type="text/javascript">var url_full = "/?p=menuedit";</script>
2. window.location.href=url_full;

You will still get the Notice error, but that won't effect your code.

 

The code

echo '<form action="/?'.$_SERVER['QUERY_STRING'].'" method="post">';

PHP:

is vulnerable to XSS, I'd strongly recommend switching to some alternative

 

Thanks for your help. That did definitely help a lot.