title: Multidimensional Arrays Nested to Unlimited Depth
body: <p>I have a multidimensional array nested to an unknown/unlimited depth.
  I'd like to be able to loop through every element.
  I don't want to use, <code>foreach(){foreach(){foreach(){}}}</code> as I don't know the depth.</p>
  
  <p>I'm eventually looking for all nested arrays called "<code>xyz</code>".  Has anyone got any suggestions?</p>