print $#array, 'x', max( map $#{ $_ // [] }, @array );;

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  1. $#array is the largest index of @array;
  2. $#{ $_ } is the largest index of the array referenced by $_
  3. map assigns each of the values in @array to $_ in turn.
  4. Many of them will be undefined, if so, // [] substitutes an empty array for that value.
  5. Thus, the map extracts the highest indexes of all the subarrays in @array and substitutes 0 for those that are empty or don't exist.
  6. max() finds and returns the largest of those.
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In reply to Re^3: Max dimensions of multi-dimensional array by BrowserUk
in thread Max dimensions of multi-dimensional array by ravi45722

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