Is there a way in the PHP parent class constructor to determine whether a subclass has a certain method?

Is there a way in the PHP parent class constructor to determine whether a subclass has a certain method? Is there a way in the PHP parent class constructor to determine whether a subclass has a certain method?

Reply content:

Is there a way in the PHP parent class constructor to determine whether a subclass has a certain method?

The hongweipeng code has an error. $ this should be changed to $ static.
Google static binding later

Fixed: Should be usedmethod_exists();
The instance code is as follows:

is_callable([$this, 'methodName'])

But this is not a good design. Theoretically, the parent class should not understand this information.

Normally, this does not exist.

However, if you refer to a specific and known subclass, you can usemethod_exists.