(PHP 5 >= 5.3.0)
SplMinHeap::compare — Compare elements in order to place them correctly in the heap while sifting up.
Compare value1 with value2 .
The value of the first node being compared.
The value of the second node being compared.
Result of the comparison, positive integer if value1 is lower than value2 , 0 if they are equal, negative integer otherwise.
Hinweis: Having multiple elements with the same value in a Heap is not recommended. They will end up in an arbitrary relative position.