ReflectionClass::getAttributes

    (PHP 8)

    ReflectionClass::getAttributes — Recupera los atributos de una clase

    Descripción

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

    Devuelve todos los atributos declarados en esta clase en forma de un array de objetos ReflectionAttribute.

    Parámetros

    name

    Filter the results to include only ReflectionAttribute instances for attributes matching this class name.

    flags

    Flags for determining how to filter the results, if name is provided.

    Default is 0 which will only return results for attributes that are of the class name.

    The only other option available, is to use ReflectionAttribute::IS_INSTANCEOF, which will instead use instanceof for filtering.

    Valores devueltos

    Un array de atributos, en forma de objetos de tipo ReflectionAttribute.

    Ejemplos

    Ejemplo #1 Uso básico de ReflectionClass::getAttributes()

    <?php
    #[Attribute]
    class     Fruit {
    }

    #[    Attribute]
    class     Rouge {
    }

    #[    Fruit]
    #[    Rouge]
    class     Pomme {
    }

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

    El resultado del ejemplo sería:

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

    Ejemplo #2 Filtrar los resultados por un nombre de clase

    <?php
    #[Attribute]
    class     Fruit {
    }

    #[    Attribute]
    class     Rouge {
    }

    #[    Fruit]
    #[    Rouge]
    class     Pomme {
    }

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

    El resultado del ejemplo sería:

    Array
(
    [0] => Fruit
)

    Ejemplo #3 Filtrar los resultados por nombre de clase, con herencia

    <?php
    interface Couleur {
    }

    #[    Attribute]
    class     Fruit {
    }

    #[    Attribute]
    class     Rouge implements Couleur {
    }

    #[    Fruit]
    #[    Rouge]
    class     Pomme {
    }

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

    El resultado del ejemplo sería:

    Array
(
    [0] => Rouge
)

    Ver también

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    User Contributed Notes 2 notes

    up
    2
    sandrenyl at gmail dot com
    3 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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