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SplPriorityQueue::compare (PHP 5 >= 5.3.0, PHP 7, PHP 8) SplPriorityQueue::compare — Compare priorities in order to place elements correctly in the heap while sifting up
Apr 22, 2021 · The SplPriorityQueue::compare () function is an inbuilt function in PHP which is used to compare the priority queue elements to place at a particular order in the heap data structure.
Sep 7, 2025 · SplPriorityQueue::compare — Compare priorities in order to place elements correctly in the heap while sifting up SplPriorityQueue::count — Counts the number of elements in the queue SplPriorityQueue::current — Return current node pointed by the iterator SplPriorityQueue::extract — Extracts a node from top of the heap and sift up
In the priorityQueue->insert(value, priority) method of the SplPriorityQueue class, the second parameter, priority, specifies the priority of the element being inserted. The queue uses this priority to order its elements, ensuring that elements with higher priority values will be extracted before those with lower priority values.
Aug 20, 2025 · The SplPriorityQueue class in PHP provides a robust foundation for managing prioritized data structures. At its core lies the compare() method, a pivotal component that determines how elements are ordered within the queue.
Methods public __construct () — Constructs a new empty queue compare () — Compare priorities in order to place elements correctly in the heap while sifting up. count () — Counts the number of elements in the queue. current () — Return current node pointed by the iterator extract () — Extracts a node from top of the heap and sift up.
Result of the comparison, positive integer if ```priority1``` is greater than ```priority2```, 0 if they are equal, negative integer otherwise.
