Pass a value into filter_input() using variable

Question

Can anyone please explain, why do I get very strange warning:

filter_input() expects parameter 1 to be long, string given

when executing the co

Answer 1

What you're supposed to use there are constants. These constants have integer values. So the documentation is entirely correct, INPUT_GET is an integer. Try var_dump(INPUT_GET).

If you need to get a constant value from a string, use constant():

echo constant('INPUT_' . $type);