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    ReflectionClass::getAttributes

    (PHP 8)

    ReflectionClass::getAttributes — Gets Attributes

    Descrição

    public ReflectionClass::getAttributes(?string $name = null, int $flags = 0): array

    Returns all attributes declared on this class as an array of ReflectionAttribute.

    Parâmetros

    name

    Filtra os resultados para incluir apenas instâncias de ReflectionAttribute para atributos correspondentes a este nome de classe.

    flags

    Flags para determinar como filtrar os resultados, se name for fornecido.

    O padrão é 0, que retornará apenas os resultados para atributos que são da classe name.

    A única outra opção disponível é usar ReflectionAttribute::IS_INSTANCEOF, que usará instanceof para filtragem.

    Valor Retornado

    Array of attributes, as a ReflectionAttribute object.

    Exemplos

    Exemplo #1 Basic usage

    <?php
    #[Attribute]
    class     Fruit {
    }

    #[    Attribute]
    class     Red {
    }

    #[    Fruit]
    #[    Red]
    class     Apple {
    }

    $class = new ReflectionClass('Apple');
    $attributes = $class->getAttributes();
    print_r(array_map(fn($attribute) => $attribute->getName(), $attributes));
    ?>

    O exemplo acima produzirá:

    Array
(
    [0] => Fruit
    [1] => Red
)

    Exemplo #2 Filtering results by class name

    <?php
    #[Attribute]
    class     Fruit {
    }

    #[    Attribute]
    class     Red {
    }

    #[    Fruit]
    #[    Red]
    class     Apple {
    }

    $class = new ReflectionClass('Apple');
    $attributes = $class->getAttributes('Fruit');
    print_r(array_map(fn($attribute) => $attribute->getName(), $attributes));
    ?>

    O exemplo acima produzirá:

    Array
(
    [0] => Fruit
)

    Exemplo #3 Filtering results by class name, with inheritance

    <?php
    interface Color {
    }

    #[    Attribute]
    class     Fruit {
    }

    #[    Attribute]
    class     Red implements Color {
    }

    #[    Fruit]
    #[    Red]
    class     Apple {
    }

    $class = new ReflectionClass('Apple');
    $attributes = $class->getAttributes(Color::class, ReflectionAttribute::IS_INSTANCEOF);
    print_r(array_map(fn($attribute) => $attribute->getName(), $attributes));
    ?>

    O exemplo acima produzirá:

    Array
(
    [0] => Red
)

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    User Contributed Notes 2 notes

    up
    2
    sandrenyl at gmail dot com
    2 years ago
    When using the method getAttributes() to fetch attributes based on a parent class, the proper flag constant is ReflectionAttribute::IS_INSTANCEOF (which equals 2 as mentionned by sergiolibe).

    <?php
    $reflectionClass    ->getAttributes(SomeParentAttribute::class, ReflectionAttribute::IS_INSTANCEOF);
    ?>
    up
    1
    sergiolibe at gmail dot com
    3 years ago
    When using getAttributes() with specific attribute class and flags, flag 0 will return just matching attributes with specified class, and 2 will return matching attributes with specified class and children of that class:
    <?php
            #[Attribute(\Attribute::TARGET_CLASS)]
            class SomeAttribute {}

            #[Attribute(\Attribute::TARGET_CLASS)]
            class ChildAttribute extends SomeAttribute {}

            #[SomeAttribute]
        #[SomeChildAttribute]
            class SomeClass {}

            $rc = new ReflectionClass(SomeClass::class);

            $r_atts = $rc->getAttributes(SomeAttribute::class, 0); // 0 is default, just given class
            echo json_encode(array_map(fn(ReflectionAttribute $r_att) => $r_att->getName(), $r_atts)), PHP_EOL;

            $r_atts = $rc->getAttributes(SomeAttribute::class, 2); // given class and children classes
            echo json_encode(array_map(fn(ReflectionAttribute $r_att) => $r_att->getName(), $r_atts)), PHP_EOL;
    ?>

    output:
    ["SomeAttribute"]
    ["SomeAttribute","ChildAttribute"]
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