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The SplMaxHeap class

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

Introduction

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

Class synopsis

class SplMaxHeap extends SplHeap implements Iterator, Countable {
/* Methods */
protected compare(mixed $value1, mixed $value2): int
/* Inherited methods */
protected SplHeap::compare(mixed $value1, mixed $value2): int
public SplHeap::count(): int
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::valid(): bool
}

Table of Contents

  • SplMaxHeap::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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MuLoT [ojousset49 at yahoo dot fr]
10 years ago
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
*/
?>
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