PHP - Manual: ReflectionClass::getAttributes

2024-12-21

ReflectionClass::getConstant »

« ReflectionClass::export

ReflectionClass::getAttributes

(PHP 8)

ReflectionClass::getAttributes — Gets Attributes

说明

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

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

参数

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.

返回值

Array of attributes, as a ReflectionAttribute object.

范例

示例 #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));
?>

以上例程会输出：

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

示例 #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));
?>

以上例程会输出：

Array
(
    [0] => Fruit
)

示例 #3 Filtering results by class name, with inheritance


<?php
interface Color {
}

#[Attribute]
class Fruit {
}

#[Attribute]
class Red implements Colour {
}

#[Fruit]
#[Red]
class Apple {
}

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

以上例程会输出：

Array
(
    [0] => Red
)

参见

ReflectionClassConstant::getAttributes() - Gets Attributes
ReflectionFunctionAbstract::getAttributes() - Gets Attributes
ReflectionParameter::getAttributes() - Gets Attributes
ReflectionProperty::getAttributes() - Gets Attributes

add a note

User Contributed Notes 2 notes

down

sandrenyl at gmail dot com ¶

6 months 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);
?>

down

sergiolibe at gmail dot com ¶

11 months 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"]

add a note

官方地址：https://www.php.net/manual/en/reflectionclass.getattributes.php

有任何技术问题请点击这里网站运营推广招聘

IT PHP 编程语言 Linux 开发编程科技 Elasticsearch HTML/CSS/XML 网络数据库 JAVA 面试 NoSQL C/C++ Golang Git 算法操作系统正则表达式 Redis 互联网 MySql JavaScript 运维软件国际架构设计 Mac OS TCP/IP Excel Vim Windows Socket Oracle VR MongoDB Python 运营 MemCache 商业硬件电子娱乐设计 nginx 摄影游戏 WordPress HTTP 团建数码电器

php7 安装fileinfo扩展 preg_split — 通过一个正则表达式分隔字符串 php位值,解决 PHP 中 usort 在值相同时改变原始位置的问题 [PHP] inet_pton/inet_ntop IP地址转换函数 PHP 8.1 [鸟哥]PHP_INT_MIN 和 -9223372036854775808 adodb手册 ADORecordSet对象 opcache预加载 Composer的Packagist资源 array_multisort() 多字段排序 PHPMailer设置utf8 PHPMailer字符集CharSet mysql面试题 PHP json解析（json_decode）页面工具 php中几种注释规范 [原创]诡异的php-fpm超时问题纯php实现DES以及TripleDES加密算法 php 修改图片大小支持php7的性能采集扩展 PHP5 扩展SOAP 调用 webservice

略微加速

PHP官方手册 - 互联网笔记

ReflectionClass::getAttributes

说明

参数

返回值

范例

参见

User Contributed Notes 2 notes