PHP 8.4.0 RC4 available for testing

    ReflectionParameter::allowsNull

    (PHP 5, PHP 7, PHP 8)

    ReflectionParameter::allowsNull — Comprueba si null es permitido

    Descripción

    public ReflectionParameter::allowsNull(): bool

    Comprueba si el parámetro permite null.

    Advertencia

    Esta función no está documentada actualmente, solamente se encuentra disponible la lista de parámetros.

    Parámetros

    Esta función no tiene parámetros.

    Valores devueltos

    true si null es permitido, en caso contrario false

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    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
    8 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()`.
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