PHPKonf 2020 Online

Iterator::key

(PHP 5, PHP 7, PHP 8)

Iterator::keyRetourne la clé de l'élément courant

Description

abstract public Iterator::key ( ) : scalar

Retourne la clé de l'élément courant.

Liste de paramètres

Cette fonction ne contient aucun paramètre.

Valeurs de retour

Retourne un scalaire en cas de succès, ou NULL si une erreur survient.

Erreurs / Exceptions

Émet une alerte de type E_NOTICE si une erreur survient.

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User Contributed Notes 3 notes

up
7
michaelgranados at gmail dot com
7 years ago
Since PHP 5.5.X foreach can accept non scalar items. So the return can be anything ;)
up
-1
sofe2038 at gmail dot com
3 months ago
This function may return any type, not just scalar, for some Iterator types. In particular, it is very trivial to write a generator function that yields arbitrary keys:

<?php
function foo() {
  yield
null => 1;
  yield new
stdclass => 2;
}
?>
up
-1
Lszl Lajos Jnszky
8 years ago
And converts everything to integer except string, so in php the post process could be:

    public function key() {
        $yourKey = $this->createYourKey();
        if (is_object($yourKey) || is_array($yourKey))
            throw new Exception('Array and Object not allowed.');
        elseif (is_string($yourKey))
            return $yourKey;
        else
            return (int) $yourKey;
    }
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