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<?php class Foo implements \Countable { public function count() : int { return 5; } static public function doFoo() { $foo = new Foo(); assertType('int<0, max>', $foo->count()); } } var_dump(count(new Foo()));
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
int(5)

preferences:
108.75 ms | 406 KiB | 5 Q