php教程

The SplMaxHeap class

(PHP 5 >= 5.3.0, PHP 7)

简介

The SplMaxHeap class provides the main functionalities of a heap, keeping the maximum on the top.

类摘要

SplMaxHeap 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 ( void ) : int
public SplHeap::current ( void ) : mixed
public SplHeap::extract ( void ) : mixed
public SplHeap::insert ( mixed $value ) : void
public SplHeap::isCorrupted ( void ) : bool
public SplHeap::isEmpty ( void ) : bool
public SplHeap::key ( void ) : mixed
public SplHeap::next ( void ) : void
public SplHeap::recoverFromCorruption ( void ) : void
public SplHeap::rewind ( void ) : void
public SplHeap::top ( void ) : mixed
public SplHeap::valid ( void ) : bool
}

Table of Contents

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

User Contributed Notes

MuLoT [ojousset49 at yahoo dot fr] 17-Dec-2010 05:50
SplMaxHeap simple example with integer values...

<?php
class MySimpleHeap extends SplHeap
{
    public function  compare( $value1, $value2 ) {
        return ( $value1 - $value2 );
    }
}

$obj = new MySimpleHeap();
$obj->insert( 4 );
$obj->insert( 8 );
$obj->insert( 1 );
$obj->insert( 0 );

foreach( $obj as $number ) {
    echo $number.\"\\n\";
}

/*
    Output display :
    8
    4
    1
    0
*/
?>

CopyRight © 2008-2022 verySource.Com All Rights reserved.　京ICP备17048824号-1　京公网安备：11010502034788