If you are unable to upgrade to PHP 7.3 (not released at the time of writing), you can use this simple polyfill:
<?php
if (!function_exists('is_countable')) {
function is_countable($var) {
return (is_array($var) || $var instanceof Countable);
}
}
?>
is_countable
(PHP 7 >= 7.3.0, PHP 8)
is_countable — Vérifie si le contenu de la variable est une valeur dénombrable
Description
Vérifie si le contenue de la variable est un tableau array ou un object qui implémente Countable
Liste de paramètres
-
value -
La variable à vérifier
Valeurs de retour
Retourne true si value est dénombrable, false
sinon.
Historique
| Version | Description |
|---|---|
| 7.3.0 | is_countable() a été ajouté. |
Exemples
Exemple #1 Exemples avec is_countable()
<?php
var_dump(is_countable([1, 2, 3])); // bool(true)
var_dump(is_countable(new ArrayIterator(['foo', 'bar', 'baz']))); // bool(true)
var_dump(is_countable(new ArrayIterator())); // bool(true)
var_dump(is_countable(new stdClass())); // bool(false)
Voir aussi
- is_array() - Détermine si une variable est un tableau
- is_object() - Détermine si une variable est de type objet
- is_iterable() - Détermine si le contenu de la variable est itérable.
- is_bool() - Détermine si une variable est un booléen
add a note
User Contributed Notes 6 notes
info at arisendrake dot de ¶
5 years ago
renic ¶
4 years ago
be wary of using is_object($var) and assuming that the object has implemented Countable. Not all objects are countable directly with count().
danmichaelo at gmail dot com ¶
5 years ago
Note that a polyfill for this method is also provided by the symfony/polyfill project.
Anonymous ¶
3 years ago
Fixed polyfill:
<?php
if (! function_exists('is_countable')) {
/**
* @param mixed $value The value to check
* @return bool
*/
function is_countable($value): bool
{
return is_array($value) || (is_object($value) && $value instanceof Countable);
}
}
?>
info at ensostudio dot ru ¶
3 years ago
Note: if is_countable() return true is does not guarantee that the it can be calculated recursively and correctly:
<?php
$iterator = new ArrayIterator(['one', 'two', new ArrayIterator(['three', 'four'])]);
var_dump(is_countable($iterator), count($iterator, COUNT_RECURSIVE));
// return TRUE and 3!
?>
deoomen ¶
5 years ago
Polyfill written by arisendrake is not quite good. It return FALSE when checking an Simple XML Node but count() works properly on PHP 7.1 and 7.3.
Better is this one:
<?php
if (version_compare(PHP_VERSION, "7.3") < 0 && !function_exists("is_countable")) {
function is_countable($var): bool
{
return (is_array($var) || is_object($var) || is_iterable($var) || $var instanceof Countable);
}
}
?>
