Random\Randomizer::pickArrayKeys

(PHP 8 >= 8.2.0)

Random\Randomizer::pickArrayKeysSelect random array keys

Descripción

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.

Precaución

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.

Parámetros

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.

Valores devueltos

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().

Errores/Excepciones

Ejemplos

Ejemplo #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";
?>

El resultado del ejemplo sería algo similar a:

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

Ejemplo #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";
?>

El resultado del ejemplo sería algo similar a:

Values: 🍎, 🍇

Ver también

  • array_keys() - Devuelve todas las claves de un array o un subconjunto de claves de un array
add a note

User Contributed Notes

There are no user contributed notes for this page.
To Top