PHP Unconference Europe 2015

SplHeap::compare

(PHP 5 >= 5.3.0)

SplHeap::compareCompare elements in order to place them correctly in the heap while sifting up.

Beschreibung

abstract protected int SplHeap::compare ( mixed $value1 , mixed $value2 )

Compare value1 with value2.

Warnung

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.

Parameter-Liste

value1

The value of the first node being compared.

value2

The value of the second node being compared.

R├╝ckgabewerte

Result of the comparison, positive integer if value1 is greater 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.

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