SplHeap::extract

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

SplHeap::extract — Extracts a node from top of the heap and sift up

Beschreibung

public SplHeap::extract(): mixed

Parameter-Liste

Diese Funktion besitzt keine Parameter.

Rückgabewerte

The value of the extracted node.

Fehler/Exceptions

Throws RuntimeException when the data-structure is empty.

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User Contributed Notes 1 note

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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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