在PHP中过滤多维输入

I create my inputs using the following pattern:

<input type="text" name="general[fooBar]">

I wanted to do something like this in my PHP code:

$request = array(
   'general' => filter_input(INPUT_POST, 'general')
);
echo $request['general']['fooBar'];

But filter_input gives me false here. What's the best way to handle this?

The issue is in the FILTER_DEFAULT,

filter_input(INPUT_POST, 'general', FILTER_DEFAULT, FILTER_REQUIRE_ARRAY);