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Random\Randomizer::pickArrayKeys

(PHP 8 >= 8.2.0)

Random\Randomizer::pickArrayKeysSelect random array keys

Açıklama

public Random\Randomizer::pickArrayKeys(array $array, int $num): array

Uniformly selects num distinct array keys of the input array.

Each key of the input array is equally likely to be returned.

Dikkat

The selection of the array keys depends on the internal structure of the input array. The returned array keys might be different for two equal input arrays and two Random\Engines with identical state, depending on how the input arrays have been created.

Bağımsız Değişkenler

array

The array whose array keys are selected.

num

The number of array keys to return; must be between 1 and the number of elements in array.

Dönen Değerler

An array containing num distinct array keys of array.

The returned array will be a list (array_is_list()). It will be a subset of the array returned by array_keys().

Hatalar/İstisnalar

Örnekler

Örnek 1 Random\Randomizer::pickArrayKeys() example

<?php
$r
= new \Random\Randomizer();

$fruits = [ 'red' => '🍎', 'green' => '🥝', 'yellow' => '🍌', 'pink' => '🍑', 'purple' => '🍇' ];

// Pick 2 random array keys:
echo "Keys: ", implode(', ', $r->pickArrayKeys($fruits, 2)), "\n";

// Pick another 3:
echo "Keys: ", implode(', ', $r->pickArrayKeys($fruits, 3)), "\n";
?>

Yukarıdaki örnek şuna benzer bir çıktı üretir:

Keys: yellow, purple
Keys: red, green, yellow

Örnek 2 Picking random values

<?php
$r
= new \Random\Randomizer();

$fruits = [ 'red' => '🍎', 'green' => '🥝', 'yellow' => '🍌', 'pink' => '🍑', 'purple' => '🍇' ];

$keys = $r->pickArrayKeys($fruits, 2);
// Look up the values for the picked keys.
$selection = array_map(
static fn (
$key) => $fruits[$key],
$keys
);

echo
"Values: ", implode(', ', $selection), "\n";
?>

Yukarıdaki örnek şuna benzer bir çıktı üretir:

Values: 🍎, 🍇

Ayrıca Bakınız

  • array_keys() - Bir dizideki tüm anahtarları veya bir anahtar altkümesini döndürür
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