SplPriorityQueue::compare

(PHP 5 >= 5.3.0, PHP 7)

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

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public SplPriorityQueue::compare ( mixed $priority1 , mixed $priority2 ) : int

Compare priority1 with priority2.

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priority1

The priority of the first node being compared.

priority2

The priority of the second node being compared.

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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.