ReflectionParameter::allowsNull

    (PHP 5, PHP 7, PHP 8)

    ReflectionParameter::allowsNull — Vérifie si la valeur null est autorisée comme valeur du paramètre

    Description

    public ReflectionParameter::allowsNull(): bool

    Vérifie si la valeur null est autorisée comme valeur du paramètre.

    Liste de paramètres

    Cette fonction ne contient aucun paramètre.

    Valeurs de retour

    true si la valeur null est autorisée comme valeur du paramètre, false sinon.

    Voir aussi

    Found A Problem?

    Learn How To Improve This Page • Submit a Pull Request • Report a Bug
    ＋add a note

    User Contributed Notes 2 notes

    up
    15
    Geoffrey LAURENT
    11 years ago
    The allowsNull method look if arguments have a type.
    If a type is defined, null is allowed only if default value is null.

    <?php
    function myfunction ( $param ) {

    }

    echo (new     ReflectionFunction("myfunction"))->getParameters()[0]->allowsNull() ? "true":"false";

    ?>

    Result : true

    <?php
    function myfunction ( stdClass $param ) {

    }

    echo (new     ReflectionFunction("myfunction"))->getParameters()[0]->allowsNull() ? "true":"false";

    ?>

    Result : false

    <?php
    function myfunction ( stdClass $param = null ) {

    }

    echo (new     ReflectionFunction("myfunction"))->getParameters()[0]->allowsNull() ? "true":"false";
    ?>

    Result : true
    up
    0
    tuncdan dot ozdemir dot peng at gmail dot com
    10 months ago
    Please note that `mixed` type parameter also returns true, as `null` is part of the `mixed` union.

    And there does not have to be a default `null` value for `->allowsNull()` to return true.

    function test (AnyType|null $param1, mixed $param2) {}

    Both parameters from the function above will return true for `allowsNull()`.
    ＋add a note
    To Top