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ReflectionParameter::getAttributes

(PHP 8)

ReflectionParameter::getAttributesGets Attributes

说明

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

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

参数

name

过滤结果,匹配此类名,仅包含 ReflectionAttribute 实例的属性。

flags

如果提供了 name,则用于确定如何过滤结果的 flag。

默认值为 0,这将导致返回的结果只属于类 name 的属性。

唯一可用的其他选项是使用 ReflectionAttribute::IS_INSTANCEOF,它将改为使用 instanceof 进行过滤。

返回值

Array of attributes, as a ReflectionAttribute object.

示例

示例 #1 Basic usage

<?php
#[Attribute]
class
Fruit {
}

#[
Attribute]
class
Red {
}

function
fruitBasket(
#[
Fruit]
#[
Red]
string $apple
) { }

$reflection = new ReflectionFunction('fruitBasket');
$parameter = $reflection->getParameter('apple');
$attributes = $parameter->getAttributes();
print_r(array_map(fn($attribute) => $attribute->getName(), $attributes));
?>

以上示例会输出:

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

示例 #2 Filtering results by class name

<?php
#[Attribute]
class
Fruit {
}

#[
Attribute]
class
Red {
}

function
fruitBasket(
#[
Fruit]
#[
Red]
string $apple
) { }

$reflection = new ReflectionFunction('fruitBasket');
$parameter = $reflection->getParameter('apple');
$attributes = $parameter->getAttributes('Fruit');
print_r(array_map(fn($attribute) => $attribute->getName(), $attributes));
?>

以上示例会输出:

Array
(
    [0] => Fruit
)

示例 #3 Filtering results by class name, with inheritance

<?php
interface Color {
}

#[
Attribute]
class
Fruit {
}

function
fruitBasket(
#[
Fruit]
#[
Red]
string $apple
) { }

$reflection = new ReflectionFunction('fruitBasket');
$parameter = $reflection->getParameter('apple');
$attributes = $parameter->getAttributes('Color', ReflectionAttribute::IS_INSTANCEOF);
print_r(array_map(fn($attribute) => $attribute->getName(), $attributes));
?>

以上示例会输出:

Array
(
    [0] => Red
)

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