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<?php trait FooTrait { private abstract function bar(); } class Foo { use FooTrait; public function bar() { return 'bar()'; } } var_dump((new Foo())->bar());
Output for 8.1.5 - 8.1.33, 8.2.10 - 8.2.29, 8.3.0 - 8.3.26, 8.4.1 - 8.4.13
string(5) "bar()"

preferences:
72.78 ms | 406 KiB | 5 Q