Constructor Needed¶
By default, classes don’t need a constructor, and it may be omitted. It is also true in the case of child classes: PHP look for a local constructor, then a parent constructor, and it is valid to have none of them.
On the other hand, if any of the child makes an explicit call to parent::__construct, then, there must be at least an explicit constructor in the family. Or, PHP generates Cannot call constructor error message.
As a rule of thumb, it might be good to always include the constructor definition, to avoid adding it later, down the road.