PHP 7.0.6 Released

    The SplMaxHeap class

    (PHP 5 >= 5.3.0, PHP 7)

    Introduction

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

    Class synopsis

    SplMaxHeap extends SplHeap implements Iterator , Countable {
    /* Methods */
    protected int compare ( mixed $value1 , mixed $value2 )
    /* Inherited methods */
    abstract protected int SplHeap::compare ( mixed $value1 , mixed $value2 )
    public int SplHeap::count ( void )
    public mixed SplHeap::current ( void )
    public mixed SplHeap::extract ( void )
    public void SplHeap::insert ( mixed $value )
    public bool SplHeap::isEmpty ( void )
    public mixed SplHeap::key ( void )
    public void SplHeap::next ( void )
    public void SplHeap::recoverFromCorruption ( void )
    public void SplHeap::rewind ( void )
    public mixed SplHeap::top ( void )
    public bool SplHeap::valid ( void )
    }

    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]
    5 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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