SplHeap::extract

(PHP 5 >= 5.3.0, PHP 7)

SplHeap::extractExtracts a node from top of the heap and sift up

Descrierea

public SplHeap::extract ( ) : mixed

Parametri

Această funcție nu are parametri.

Valorile întoarse

The value of the extracted node.

Erori/Excepții

Throws RuntimeException when the data-structure is empty.

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User Contributed Notes 1 note

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10
Sandro Alves Peres
11 years ago
<?php
$heap
= new SplMaxHeap(); # Ascending order
$heap->insert('E');
$heap->insert('B');
$heap->insert('D');
$heap->insert('A');
$heap->insert('C');

echo
$heap->extract(), PHP_EOL; # E
echo $heap->extract(), PHP_EOL; # D

$heap = new SplMinHeap(); # Descending order
$heap->insert('E');
$heap->insert('B');
$heap->insert('D');
$heap->insert('A');
$heap->insert('C');

print
PHP_EOL;
echo
$heap->extract(), PHP_EOL; # A
echo $heap->extract(), PHP_EOL; # B
?>
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