PHP 8.1.0 Beta 1 available for testing

The SplMinHeap class

(PHP 5 >= 5.3.0, PHP 7, PHP 8)

简介

The SplMinHeap class provides the main functionalities of a heap, keeping the minimum on the top.

类摘要

SplMinHeap extends SplHeap implements Iterator, Countable {
/* 方法 */
protected compare(mixed $value1, mixed $value2): int
/* 继承的方法 */
abstract protected SplHeap::compare(mixed $value1, mixed $value2): int
public SplHeap::count(): int
public SplHeap::insert(mixed $value): void
public SplHeap::isCorrupted(): bool
public SplHeap::isEmpty(): bool
public SplHeap::next(): void
public SplHeap::rewind(): void
public SplHeap::valid(): bool
}

目录

  • SplMinHeap::compare — Compare elements in order to place them correctly in the heap while sifting up
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User Contributed Notes 1 note

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2
gom
1 year ago
I experimented what happens when arrays are inserted:

<?php
$heap
= new SplMinHeap();
$heap->insert([22,333]);
$heap->insert([2,33]);
$heap->insert([222,3]);

var_export($heap->extract());
echo
'<br>';
var_export($heap->extract());
echo
'<br>';
var_export($heap->extract());
?>

Output:

array ( 0 => 2, 1 => 33, )
array ( 0 => 22, 1 => 333, )
array ( 0 => 222, 1 => 3, )
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