Description:
------------
For years I've been using isset($foo[$x][$y]) to arbitrary depth and relying on it checking each array dimension in turn.

I've just now noticed that the documentation does not explicitly state that this depth-checking is a Feature.

It probably should be documented and given an example...


Test script:
---------------
<?php
	error_reporting(E_ALL);
	$foo[0] = 'This is not an array with a key of "value" to be used.';
	if (isset($foo[0]['value'])){
		echo "Right.";
	}
	else{
		echo "Wrong.";
	}
?>


Expected result:
----------------
I see what I expect to see, except the docs don't explicitly state that I've been doing it right for a decade :-)