[Haskell-cafe] Would you mind explain such a code ?

[zaxis]

myFoldl :: (a -> b -> a) -> a -> [b] -> a

myFoldl f z xs = foldr step id xs z
    where step x g a = g (f a x)

I know myFoldl implements foldl using foldr. However i really donot know how
it can do it ?

Please shed a light one me, thanks!
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