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<?php // declare(strict_types=1); namespace Test\Biz; //error_reporting(-1); class Foo { public function bar($value) { if (\is_callable($value)) { return $this->baz($value); } } public function baz(callable $callable) { return $callable; } } function demonstrate2(callable $callable) { return $callable; } echo (new Foo())->bar('\Test\Biz\Foo::bar'); demonstrate2('\Test\Biz\Foo::bar');