Description:
------------
the import_request_variables always return false in any condition.

Reproduce code:
---------------
---
From manual page: function.import-request-variables#Return Values
---
	
	if(import_request_variables('p', 'post_'))
	{
		echo "unimport the request<br/>";
		phpinfo();
	}
	
	if(isset($post_username))
	{
		echo "<strong>", $post_username, "</strong><br/>";
	}
	
	if(isset($post_email))
	{
		echo "<strong>", $post_email, "</strong><br/>";
	}
	
	if(isset($post_message))
	{
		echo "<strong>", $post_message, "</strong>";
	}

Expected result:
----------------
I think the import_request_varibles return true

Actual result:
--------------
it return false, and return false anytime, if I run php5 in command line or in apache.