Normal:
$array = [
           {
             'A' => 'B',
             'C' => 'D',
             'E' => 'F'
           },
           'foo',
           $array->[0],
           [
             $array->[0],
             'bar',
             $array->[0],
             $array
           ]
         ];

Deepcopy:
$array = [
           {
             'A' => 'B',
             'C' => 'D',
             'E' => 'F'
           },
           'foo',
           {
             'A' => 'B',
             'C' => 'D',
             'E' => 'F'
           },
           [
             {
               'A' => 'B',
               'C' => 'D',
               'E' => 'F'
             },
             'bar',
             {
               'A' => 'B',
               'C' => 'D',
               'E' => 'F'
             },
             $array
           ]
         ];

Purity:
$array = [
           {
             'A' => 'B',
             'C' => 'D',
             'E' => 'F'
           },
           'foo',
           {},
           [
             {},
             'bar',
             {},
             []
           ]
         ];
$array->[2] = $array->[0];
$array->[3][0] = $array->[0];
$array->[3][2] = $array->[0];
$array->[3][3] = $array;

PureDeep:
$array = [
           {
             'A' => 'B',
             'C' => 'D',
             'E' => 'F'
           },
           'foo',
           {
             'A' => 'B',
             'C' => 'D',
             'E' => 'F'
           },
           [
             {
               'A' => 'B',
               'C' => 'D',
               'E' => 'F'
             },
             'bar',
             {
               'A' => 'B',
               'C' => 'D',
               'E' => 'F'
             },
             []
           ]
         ];
$array->[3][3] = $array;