i think
in most cases PMA should use $_REQUEST directly and use one
of the above function only to set default values
using of $_REQUEST makes it more clear where this variable came
from, reminding the developer always to take care with this variables!
I don't understand why using $_REQUEST makes more clear where this
variable came from. In $_REQUEST, variables can come from EGPCS, as
defined by the variables_order directive. I think that it's better to
say explicitly where we expect each variable to come from.