I want to pass in a scalar int, or an array of ints (indices) to a
function in a class. The scalar or array will be a class variable. 

Without knowing the max size of each index, or the number of indices,
(as is required is most other languages), I can't figure out how to
access the array in a flexible fashion.  What I **WANT** to use as a
clue is whether the passed $index value is a scalar, or how many
elements are in the array.

examples:

function work_on_array( $value, $index ){
  blah to $this->value_s_holder;
   .. 
   ..
}

work_on_array( 7, array(4,5) );
work_on_array( 23, 1 );

The number of INDICES will not change during program execution, although
I do not want to have to predict the range of the scalar/indices.

any ideas?

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