Determining how 'deep' an element of a multidimensional array is

I need to determine how 'deep' an element is within a multidimensional array. For example, following the code snippet, how can I determine whether an element is in the first level, the second level, the third level, etc.? How can I determine that "Vancouver" is nested three levels deep?

Ideally I would be looking for a return of an integer - so looking for "Countries" would return 0, "USA" would return 1, "Seattle" would return 2, etc.
$myArray = array(
		"Countries" => array(
				"Canada" => array(
						"Vancouver", "Toronto"),
				"USA" => array(
						"New York", "Seattle"),
				     ),
		);

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radarhillAsked:
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Roger BaklundConnect With a Mentor Commented:
Try this:
function howDeep($a,$target,$level=0) {
  if(in_array($target,array_keys($a)))
    return $level;
  foreach($a as $key=>$sub_array) {
    if(is_array($sub_array)) {
      $tmp = howDeep($sub_array,$target,$level+1);
      if($tmp) 
        return $tmp;
    } elseif($sub_array==$target)
      return $level;
  }
  return false;
}
echo howDeep($myArray,'Seattle');

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radarhillAuthor Commented:
Perfect - thanks!
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