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<?php class FooRequest { public ?string $foo; } $a = new FooRequest(); $p = new ReflectionProperty(FooRequest::class, 'foo'); #var_dump(isset($a->foo)); #var_dump(property_exists($a, 'foo')); var_dump($p->isInitialized($a)); $a2 = new FooRequest(); $a2->foo = null; #var_dump(isset($a2->foo)); #var_dump(property_exists($a2,'foo')); var_dump($p->isInitialized($a2)); $a3 = new FooRequest(); $a3->foo = 'foobar'; #var_dump(isset($a3->foo)); #var_dump(property_exists($a3,'foo')); var_dump($p->isInitialized($a3));