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Dokumen ini menggunakan Manual laman web PHP Cina Lepaskan
(PHP 5 >= 5.3.0)
The SplHeap class provides the main functionalities of a Heap.
$value1
, mixed $value2
)$value
)[#1] igorsantos07 at gmail dot com [2014-06-26 01:02:18]
While Michelangelo Van Dam example (http://br2.php.net/manual/en/class.splheap.php#93930) is a great demonstration of what can be done with SplHeap, this implementation is exactly what SplPriorityQueue does - based on SplMaxHeap. If you're planning to copy that snippet, go no further! There's a SPL class that does exactly what you want :)
[#2] Michelangelo van Dam [2009-10-06 23:44:31]
To have a good idea what you can do with SplHeap, I created a little example script that will show the rankings of Belgian soccer teams in the Jupiler League.
<?php
class JupilerLeague extends SplHeap
{
public function compare($array1, $array2)
{
$values1 = array_values($array1);
$values2 = array_values($array2);
if ($values1[0] === $values2[0]) return 0;
return $values1[0] < $values2[0] ? -1 : 1;
}
}
// Let's populate our heap here (data of 2009)
$heap = new JupilerLeague();
$heap->insert(array ('AA Gent' => 15));
$heap->insert(array ('Anderlecht' => 20));
$heap->insert(array ('Cercle Brugge' => 11));
$heap->insert(array ('Charleroi' => 12));
$heap->insert(array ('Club Brugge' => 21));
$heap->insert(array ('G. Beerschot' => 15));
$heap->insert(array ('Kortrijk' => 10));
$heap->insert(array ('KV Mechelen' => 18));
$heap->insert(array ('Lokeren' => 10));
$heap->insert(array ('Moeskroen' => 7));
$heap->insert(array ('Racing Genk' => 11));
$heap->insert(array ('Roeselare' => 6));
$heap->insert(array ('Standard' => 20));
$heap->insert(array ('STVV' => 17));
$heap->insert(array ('Westerlo' => 10));
$heap->insert(array ('Zulte Waregem' => 15));
// For displaying the ranking we move up to the first node
$heap->top();
// Then we iterate through each node for displaying the result
while ($heap->valid()) {
list ($team, $score) = each ($heap->current());
echo $team . ': ' . $score . PHP_EOL;
$heap->next();
}
?>
This results in the following output:
Club Brugge: 21
Anderlecht: 20
Standard: 20
KV Mechelen: 18
STVV: 17
Zulte Waregem: 15
AA Gent: 15
G. Beerschot: 15
Charleroi: 12
Racing Genk: 11
Cercle Brugge: 11
Kortrijk: 10
Lokeren: 10
Westerlo: 10
Moeskroen: 7
Roeselare: 6
Hope this example paved the way for more complex implementations of SplHeap.