Description:
------------
When I use unset to dele a specific array inside an array, it deletes the specific array and all array  on the same level behind this specific array.

My structure:
*0: 0: id -> 0
	1: name -> Teig
	2: doing -> 
	*3: 0: q -> 100
		1: u -> g
		2: p -> wheat_flour
	*4: 1:  q -> 100
		1: u -> g
		2: p -> sugar
	*5: 2: q -> 100
		1: u -> g
		2: p -> milk
1: count -> 1
2: uidR -> 2

The star infront of the key says that it is an array.

If I execute 
unset($array[0][1]);
the array *4 will be deleted but also the next one (*5). If after *5 additional arrays would be follow, these would be also deleted.

I know, that in the past this was working, but I am sorry, I don't know when.



Test script:
---------------
<?php

$array [0]= ['id' => 0, 'name' => 'Teig', 'doing' => 'Test'];
$array[0][0] = ['q' => '100', 'u' => 'g', 'p' => 'wheat_flour'];
$array[0][1] = ['q' => '100', 'u' => 'g', 'p' => 'sugar'];
$array[0][2] = ['q' => '100', 'u' => 'g', 'p' => 'milk'];
$array[] = ['count' => '1', 'uidR' => '2'];

unset($array[0][1]);

Expected result:
----------------
*0: 0: id -> 0
	1: name -> Teig
	2: doing -> 
	*3: 0: q -> 100
		1: u -> g
		2: p -> wheat_flour
	*5: 2: q -> 100
		1: u -> g
		2: p -> milk
1: count -> 1
2: uidR -> 2

Actual result:
--------------
*0: 0: id -> 0
	1: name -> Teig
	2: doing -> 
	*3: 0: q -> 100
		1: u -> g
		2: p -> wheat_flour
1: count -> 1
2: uidR -> 2