(PHP 5 >= 5.3.0, PHP 7)
SplDoublyLinkedList::offsetGet — Returns the value at the specified $index
public SplDoublyLinkedList::offsetGet ( mixed $index ) : mixed
index
The index with the value.
 The value at the specified index. 
 Throws OutOfRangeException when index is out of bounds or when index cannot be parsed as an integer. 
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    https://www.php.net/manual/en/spldoublylinkedlist.offsetget.php