ReflectionParameter::allowsNull

    (PHP 5, PHP 7, PHP 8)

    ReflectionParameter::allowsNull — null を許可するかどうかを調べる

    説明

    public ReflectionParameter::allowsNull(): bool

    パラメータが null を許可するかどうかを調べます。

    パラメータ

    この関数にはパラメータはありません。

    戻り値

    null を許可する場合に true、それ以外の場合に false を返します。

    参考

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    User Contributed Notes 2 notes

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    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
    9 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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