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

    up
    45
    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) || $var instanceof Countable);
    }
    }
    ?>
    up
    3
    renic
    5 years ago
    be wary of using is_object($var) and assuming that the object has implemented Countable. Not all objects are countable directly with count().
    up
    2
    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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