SplMinHeap::compare

(PHP 5 >= 5.3.0, PHP 7, PHP 8)

SplMinHeap::compare — Compare elements in order to place them correctly in the heap while sifting up

protected SplMinHeap::compare(mixed $value1, mixed $value2): int

Compare value1 with value2.

Result of the comparison, positive integer if value1 is lower than value2, 0 if they are equal, negative integer otherwise.

注意:
Having multiple elements with the same value in a Heap is not recommended. They will end up in an arbitrary relative position.

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