is_countable

(PHP 7 >= 7.3.0, PHP 8)

is_countable — Verify that the contents of a variable is a countable value

Descrizione

is_countable(mixed $value): bool

Verify that the contents of a variable is an array or an object implementing Countable

Elenco dei parametri

value: The value to check

Valori restituiti

Returns true if value is countable, false otherwise.

Log delle modifiche

Versione	Descrizione
7.3.0	is_countable() has been added.

Esempi

Example #1 is_countable() examples

<?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)

Vedere anche:

is_array() - Verifica se una variabile è un array
is_object() - Verifica se una variabile è un object
is_iterable() - Verify that the contents of a variable is an iterable value
is_bool() - Verifica se una variabile è di tipo boolean

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User Contributed Notes 3 notes

down

info at arisendrake dot de ¶

6 years ago

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);
    }
}
?>

down

renic ¶

5 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().

down

danmichaelo at gmail dot com ¶

5 years ago

Note that a polyfill for this method is also provided by the symfony/polyfill project.

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