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4 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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