Heap::parentIndex

    (Available since version 1.0)

    Heap::parentIndex — Returns the index of the parent

    Description

    protected int Heap::parentIndex ( int $index )

    Returns the index of the parent of the node referred to by the index, index, in the binary tree.

    Parameters

    index

    The index to be queried.

    Return Values

    The index of the parent or NULL if none exists.

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