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 */
protected SplHeap::compare ( mixed $value1 , mixed $value2 ) : int
public SplHeap::count ( ) : int
public SplHeap::current ( ) : mixed
public SplHeap::extract ( ) : mixed
public SplHeap::insert ( mixed $value ) : bool
public SplHeap::isCorrupted ( ) : bool
public SplHeap::isEmpty ( ) : bool
public SplHeap::key ( ) : int
public SplHeap::next ( ) : void
public SplHeap::rewind ( ) : void
public SplHeap::top ( ) : mixed
public SplHeap::valid ( ) : bool
}

Table of Contents

  • SplMinHeap::compare — Compare elements in order to place them correctly in the heap while sifting up

User Contributed Notes

gom 27-Jan-2020 07:12
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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