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<?php function reflectCallable($arg): ReflectionFunctionAbstract { if (is_array($arg)) { $ref = new ReflectionMethod(...$arg); } elseif (is_callable($arg)) { $ref = new ReflectionFunction($arg); } return $ref; } function definedFunc(Foo $foo) {} $callable = function(Foo $foo) {}; class Bar { public function baz(Foo $foo) {} } foreach (['definedFunc', $callable, ['Bar', 'baz']] as $callable) { $reflected = reflectCallable($callable); if ((string) $reflected->getParameters()[0]->getType() === 'Foo') { echo 'Callable takes Foo', PHP_EOL; } }