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    ReflectionFunction::isAnonymous

    (PHP 8 >= 8.2.0)

    ReflectionFunction::isAnonymous — 関数が無名関数かどうかを調べる

    説明

    public ReflectionFunction::isAnonymous(): bool

    関数が 無名関数 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

    関数が無名関数の場合、true を返します。そうでない場合、false を返します。

    例

    例1 ReflectionFunction::isAnonymous() の例

    <?php

    $rf     = new ReflectionFunction(function() {});
    var_dump($rf->isAnonymous());

    $rf = new ReflectionFunction('strlen');
    var_dump($rf->isAnonymous());
    ?>

    上の例の出力は以下となります。

    bool(true)
bool(false)

    参考

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    User Contributed Notes 2 notes

    up
    1
    nicolasgrekas at php dot net
    2 years ago
    Closures can be either anonymous or not.

    Here is an anonymous closure:
    $c1 = function () {};

    And here is a *non* anonymous closure:
    $c2 = Closure::fromCallable(['Foo', 'bar']);

    ReflectionFunction::isAnonymous() returns true for $c1 and false for $c2.

    Before PHP 8.2, one had to do this check to decide between both:
    $r = new \ReflectionFunction($c1);
    $isAnonymous = false !== strpos($r->name, '{closure}');

    ReflectionFunction::isAnonymous() makes it easier to check.
    up
    0
    Taufik Nurrohman
    2 years ago
    You know that anonymous function is just an instance of class `Closure` so this would be equivalent to check whether a variable is an anonymous function or not:

    <?php

    $test     = function () {};

    if (    is_callable($test) && is_object($test) && $test instanceof Closure) { /* ... */ }

    ?>
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