3v4l.org

run code in 500+ PHP versions simultaneously
<?php class Foo { protected $test; function setTest($test) { $this->test = $test; return $this; } } class Bar extends Foo { function setTest($test) : Bar { return parent::setTest($test); } } var_dump((new Bar)->setTest('test'));

preferences:
22.53 ms | 474 KiB | 4 Q