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n = Length@x;Dimensions[x]; ReplacePart[x, {i_, j_} /; 2;2 <= i <= nn[[1]] - 1 && 2 <= j <= nn[[2]] - 1 :>0]> 0]
another way:
MapAt[Times[0, #]MapAt[0 &, x, {2 ;; -2, 2 ;; -2}]
n = Length@x; ReplacePart[x, {i_, j_} /; 2 <= i <= n - 1 && 2 <= j <= n - 1 :>0]
MapAt[Times[0, #] &, x, {2 ;; -2, 2 ;; -2}]
n = Dimensions[x]; ReplacePart[x, {i_, j_} /;2 <= i <= n[[1]] - 1 && 2 <= j <= n[[2]] - 1 :> 0]
MapAt[0 &, x, {2 ;; -2, 2 ;; -2}]
