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<?php class A { public $prop; } class Unrelated { public $prop; } $r = new ReflectionProperty(A::class, 'prop'); $unrelated = new Unrelated(); $r->setValue($unrelated, 42); var_dump($unrelated);
Output for 8.1.32, 8.2.0 - 8.2.29, 8.3.0 - 8.3.26, 8.4.1 - 8.4.14
object(Unrelated)#2 (1) { ["prop"]=> int(42) }

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