Remove all objects in cocos2d game world with box2d

You can remove all objects in cocos2d game world with box2d

for(b2Body *b = _world->GetBodyList(); b; b=b->GetNext()) {

        if (b->GetUserData() != NULL) {

            CCSprite *sprite = (CCSprite *)b->GetUserData();

            [self removeChild:sprite cleanup:YES];

            _world->DestroyBody(b);

           

        }

    }