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    Compare priorities in order to place elements correctly in the heap while sifting up.
    SplPriorityQueue
    PHP Manual

    SplPriorityQueue::compare

    (No version information available, might be only in CVS)

    SplPriorityQueue::compare — Compare priorities in order to place elements correctly in the heap while sifting up.

    Description

    void SplPriorityQueue::compare ( mixed $priority1 , mixed $priority1 )

    Compare priority1 with priority2 .

    Parameters

    priority1

    The priority of the first node being compared.

    priority2

    The priority of the second node being compared.

    Return Values

    Result of the comparison, positive integer if priority1 is greater than priority2 , 0 if they are equal, negative integer otherwise.

    Note: Multiple elements with the same priority will get dequeued in no particular order.

    SplPriorityQueue
    PHP Manual

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