SplHeap::compare()

(PHP 5 >= 5.3.0, PHP 7)

Compare elements in order to place them correctly in the heap while sifting up

说明

abstractprotectedSplHeap::compare(mixed $value1, mixed $value2) : int

Compare $value1with $value2.

Warning

Throwing exceptions in SplHeap::compare() can corrupt the Heap and place it in a blocked state. You can unblock it by calling SplHeap::recoverFromCorruption(). However, some elements might not be placed correctly and it may hence break the heap-property.

参数

$value1

The value of the first node being compared.

$value2

The value of the second node being compared.

返回值

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

Note:

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