$a
array(1) {
  [0]=>
  string(8) "original"
}

${'a'}
array(1) {
  [0]=>
  string(8) "original"
}

$$a
array(1) {
  [0]=>
  string(8) "original"
}

$a[0]
array(1) {
  [0]=>
  string(8) "original"
}

$a[0][0]
array(1) {
  [0]=>
  string(8) "original"
}

$a->b
array(1) {
  [0]=>
  string(8) "original"
}

$a->b->c
array(1) {
  [0]=>
  string(8) "original"
}

$a->b[0]
array(1) {
  [0]=>
  string(8) "original"
}

$a->b[0][0]
array(1) {
  [0]=>
  string(8) "original"
}

$a->b[0]->c
array(1) {
  [0]=>
  string(8) "original"
}

C::$a
array(1) {
  [0]=>
  string(8) "original"
}

C::$a[0]
array(1) {
  [0]=>
  string(8) "original"
}

C::$a[0]->b
array(1) {
  [0]=>
  string(8) "original"
}