CascadiaPHP 2024

Generator::key

(PHP 5 >= 5.5.0, PHP 7, PHP 8)

Generator::keyObtém o chave gerada

Descrição

public Generator::key(): mixed

Obtém a chave do valor gerado.

Parâmetros

Esta função não possui parâmetros.

Valor Retornado

Retorna a chave gerada.

Exemplos

Exemplo #1 Exemplo do método Generator::key()

<?php

function Gen()
{
yield
'key' => 'value';
}

$gen = Gen();

echo
"{$gen->key()} => {$gen->current()}";

O exemplo acima produzirá:

key => value

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User Contributed Notes 1 note

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1
jasonrlester at yahoo dot com
2 years ago
This is important when considering how other Generators work such as JavaScript's an Python's. While PHP's generator has the ->valid() method they don't, or an equivalent. JS uses Iterator protocol which says next() should return an object of

{
done: bool,
value: mixed
}

In which case you can use keys->done to see if the generator can still be iterated.
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