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@ 2022-10-01T22:34:10Z

<?php
function foo(string $param = null) { var_dump($param); }
function bar(\Foo\Bar|\Foo\Baz $param = null) { var_dump($param); }

foo(null);
bar(null);

Output
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Output for 8.1.11 - 8.1.27, 8.2.10 - 8.2.17, 8.3.0 - 8.3.6: NULL NULL

preferences:dark modelive preview

59.46 ms | 402 KiB | 26 Q