PHP 8.4.0 RC4 available for testing

    ReflectionClass::getAttributes

    (PHP 8)

    ReflectionClass::getAttributes — Gets Attributes

    Descripción

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

    Returns all attributes declared on this class as an array of 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

    Array of attributes, as a ReflectionAttribute object.

    Ejemplos

    Ejemplo #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));
    ?>

    El resultado del ejemplo sería:

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

    Ejemplo #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));
    ?>

    El resultado del ejemplo sería:

    Array
(
    [0] => Fruit
)

    Ejemplo #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));
    ?>

    El resultado del ejemplo sería:

    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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