[Single topic] about PHP Object-oriented, the wrong is:

2. To implement an interface that uses the implements operator, all methods defined in the interface must be implemented in the class, otherwise a fatal error is reported.
4. class name can be a legitimate label for any non-PHP reserved word, and kanji can also be used as the class name for PHP.
6. If a constructor is defined in a subclass of PHP, the constructor of its parent class is implicitly called when the object of the subclass is created.
8. Serializing an object saves all variables of the object, but does not save the object's methods, only the name of the class is saved.

Correct answer:

[Single topic] about PHP Object-oriented, the wrong is: