根据您使用的灯具版本，您应该扩展/实现不同的类. 如果版本> = 3.0，则

Depending on what version of fixtures you use you should extend/implement different classes. If the version is >= 3.0 then

extend Fixture (use Doctrine\Bundle\FixturesBundle\Fixture;)

如果< 3.0

If < 3.0

implements FixtureInterface, ContainerAwareInterface