php-doc-en/reference/reflection/reflectionclass/getattributes.xml

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<refentry xml:id="reflectionclass.getattributes" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
 <refnamediv>
  <refname>ReflectionClass::getAttributes</refname>
  <refpurpose>Gets Attributes</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <modifier>public</modifier> <type>array</type><methodname>ReflectionClass::getAttributes</methodname>
   <methodparam choice="opt"><type class="union"><type>string</type><type>null</type></type><parameter>name</parameter><initializer>&null;</initializer></methodparam>
   <methodparam choice="opt"><type>int</type><parameter>flags</parameter><initializer>0</initializer></methodparam>
  </methodsynopsis>
  <para>
   Returns all attributes declared on this class as an array of <type>ReflectionAttribute</type>.
  </para>

 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <variablelist>
   <varlistentry>
    <term><parameter>name</parameter></term>
    <listitem>
     <para>
      Filter the results to include only <classname>ReflectionAttribute</classname>
      instances for attributes matching this class name.
     </para>
    </listitem>
   </varlistentry>
   <varlistentry>
    <term><parameter>flags</parameter></term>
    <listitem>
     <para>
      Flags for determining how to filter the results, if <parameter>name</parameter>
      is provided.
     </para>
     <para>
      Default is <literal>0</literal> which will only return results for attributes that
      are of the class <parameter>name</parameter>.
     </para>
     <para>
      The only other option available, is to use <constant>ReflectionAttribute::IS_INSTANCEOF</constant>,
      which will instead use <literal>instanceof</literal> for filtering.
     </para>
    </listitem>
   </varlistentry>
  </variablelist>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Array of attributes, as a <classname>ReflectionAttribute</classname> object.
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title>Basic usage</title>
    <programlisting role="php">
<![CDATA[
<?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));
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
Array
(
    [0] => Fruit
    [1] => Red
)
]]>
    </screen>
   </example>
  </para>
  <para>
   <example>
    <title>Filtering results by class name</title>
    <programlisting role="php">
<![CDATA[
<?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));
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
Array
(
    [0] => Fruit
)
]]>
    </screen>
   </example>
  </para>
  <para>
   <example>
    <title>Filtering results by class name, with inheritance</title>
    <programlisting role="php">
     <![CDATA[
<?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));
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
Array
(
    [0] => Red
)
]]>
    </screen>
   </example>
  </para>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><methodname>ReflectionClassConstant::getAttributes</methodname></member>
    <member><methodname>ReflectionFunctionAbstract::getAttributes</methodname></member>
    <member><methodname>ReflectionParameter::getAttributes</methodname></member>
    <member><methodname>ReflectionProperty::getAttributes</methodname></member>
   </simplelist>
  </para>
 </refsect1>

</refentry>
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