Random\Randomizer::pickArrayKeys
(PHP 8 >= 8.2.0)
Random\Randomizer::pickArrayKeys — Select random array keys
Descrição
Uniformly selects num distinct array keys of the input array.
Each key of the input array is equally likely to be returned.
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.
Parâmetros
-
array -
The array whose array keys are selected.
-
num -
The number of array keys to return; must be between
1and the number of elements inarray.
Valor Retornado
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().
Erros/Exceções
-
If
numis less than1or greater than the number of elements inarray, a ValueError will be thrown. -
Qualquer erro ou exceção Throwable lançados pelo método Random\Engine::generate()
do mecanismo
Random\Randomizer::$enginesubjacente.
Exemplos
Exemplo #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";
?>O exemplo acima produzirá algo semelhante a:
Keys: yellow, purple Keys: red, green, yellow
Exemplo #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";
?>O exemplo acima produzirá algo semelhante a:
Values: 🍎, 🍇
Veja Também
- array_keys() - Retorna todas as chaves ou uma parte das chaves de um array
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