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    ReflectionParameter::allowsNull

    (PHP 5, PHP 7, PHP 8)

    ReflectionParameter::allowsNull — null değere izin veriliyor mu diye bakar

    Açıklama

    public ReflectionParameter::allowsNull(): bool

    null değere izin veriliyorsa true döner.

    Bağımsız Değişkenler

    Bu işlevin bağımsız değişkeni yoktur.

    Dönen Değerler

    null değere izin veriliyorsa true yoksa 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
    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()`.
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