abstract-interface-method-widening.php

<?php

abstract class aFoo {
	abstract function baz( int $foobar );
}

abstract class aBar extends aFoo {
	// expected type of foobar is still int
	abstract function baz( $foobar ) : int;
}

interface iFoo {
	public function bar( array $foobar ): Bar;
}

class Bar { }
class Baz implements iFoo {
	public function bar( $foobar ): Bar { }
}