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<?php interface Foo { public function bar(?string $baz = null); } class Fooo implements Foo { public function bar(string $baz = null) { return $baz; } } class Barz extends Fooo { public function bar(?string $baz = null) { return var_export($baz, true); } } $foo = new Fooo(); $bar = new Barz(); var_dump($foo->bar(), $bar->bar());
Output for git.master, git.master_jit, rfc.property-hooks
NULL string(4) "NULL"

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