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<?php declare(strict_types=1); class Foo { public function getTest($bar = null):? int { if($bar === 'test'){ return 1; } // must return null return null; } } $test = new Foo(); var_dump($test->getTest()); var_dump($test->getTest('test'));
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.34, 8.3.0 - 8.3.35, 8.4.1 - 8.4.26, 8.5.0 - 8.5.11
NULL int(1)

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