is_iterable

    (PHP 7 >= 7.1.0, PHP 8)

    is_iterable — Verify that the contents of a variable is an iterable value

    Descrizione

    is_iterable(mixed $value): bool

    Verify that the contents of a variable is accepted by the iterable pseudo-type, i.e. that it is either an array or an object implementing Traversable

    Elenco dei parametri

    value

    The value to check

    Valori restituiti

    Returns true if value is iterable, false otherwise.

    Esempi

    Example #1 is_iterable() examples

    <?php

    var_dump    (is_iterable([1, 2, 3])); // bool(true)
    var_dump(is_iterable(new ArrayIterator([1, 2, 3]))); // bool(true)
    var_dump(is_iterable((function () { yield 1; })())); // bool(true)
    var_dump(is_iterable(1)); // bool(false)
    var_dump(is_iterable(new stdClass())); // bool(false)

    ?>

    Vedere anche:

    • is_array() - Verifica se una variabile è un array

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    User Contributed Notes 2 notes

    up
    34
    mopsyd at me dot com
    6 years ago
    A slight correction to brcontainer's polyfill, which prevents errors on a non-object in a non-blocking way, and also corrects the issue of the conditional checking "file_exists" instead of the correct "function_exists":

    if ( !function_exists( 'is_iterable' ) )
    {

    function is_iterable( $obj )
    {
    return is_array( $obj ) || ( is_object( $obj ) && ( $obj instanceof \Traversable ) );
    }

    }

    The original answer would not have resolved correctly, because it was looking for a file instead of a function, and the provided method would error if given a non-iterable non-object value such as false.
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