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Compare priorities in order to place elements correctly in the heap while sifting up.
SplPriorityQueue
PHP Manual

SplPriorityQueue::compare

(No version information available, might be only in CVS)

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

Description

void SplPriorityQueue::compare ( mixed $priority1 , mixed $priority1 )

Compare priority1 with priority2 .

Parameters

priority1

The priority of the first node being compared.

priority2

The priority of the second node being compared.

Return Values

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.

SplPriorityQueue
PHP Manual