Small foreach question

Hi there!

I want to do a htmlspecialchars over each value in the $_POST array after posting a form. I came up with this:

foreach($_POST as $key => $value)
	{
	$value = htmlspecialchars($value, ENT_QUOTES);
	}

But it doesn't seem to work. I know that it might be stupid, but does someone know what I'm doing wrong?

Thanks in advance!

$_POST = array_map('htmlspecialchars', $_POST);

Thanks, that was really usefull! I took the liberty of enhancing it I bit. Here it is:

function htmlspecial($value)
	{
		return($value = htmlspecialchars($value, ENT_QUOTES));
	}

$_POST = array_map('htmlspecial', $_POST);