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This should be a elementary question but why is better to use something like this:
$pwd = filter_input(INPUT_POST, 'pwd');
Instead of just:
$pwd = $_POST['pwd'];
PS: I understand that the filter extension can be used with more arguments to provide an additional level of sanitization.
It’s not.
$_GET,$_POST,$_COOKIEand$_REQUESTare filtered with default filter.filter_input(INPUT_POST, 'pwd')without additional parameters also uses the default filter. So there is no difference at all.