Relationships and differences among classes, interfaces, and features

If you cannot read the table, review the first three articles. This is a summary table. Comparison is more intuitive.

If you cannot read the table, review the first three articles. This is a summary table. Comparison is more intuitive. -Class Interface Trait encapsulates the attributes and behaviors of a Class of objects. Abstract The behavior rules of a class object without paying attention to its specific implementation. Solve the limitation of single inheritance. (The Historical solution is to use the mixed Class (Mixin) class Class CIA

If you cannot read the table, review the first three articles. This is a summary table. Comparison is more intuitive.

-	Class	Interface	Trait
Purpose	Encapsulate the attributes and behaviors of a class of objects.	Abstract The behavior rules of a class object without paying attention to its specific implementation.	Solve the limitation of single inheritance. (The Historical solution is to use Mixin ))
Class	Class ClassA extends ClassB	Class Class implements Interface	Class Class { Use Trait; }
Interface	-	Interface1 extends Interface2	-
Trait	-	-	Trait Trait1 { Use Trait2; }
* Note: The above are the available relationships among the three. The specific differences are as follows!
Abstract	Class (abstract class), method (abstract method)	-	Method (abstract method)
Final	Class (not inherited), method (not overridden)	-	Method (not override)
Const	Class Constants	Has an interface constant	-
Static	Static variables and static methods	Static Method	Static variables and static methods
Access Control Public Protected Private	Inheritance can change access control Only public Use Trait can use as to change access control.	-	Use Trait to change access control using
Variable with the same name	Overwrite (extends Class) Use Trait)	-	Use Trait)
Method with the same name	Overwrite (extends) Use Trait can be resolved using insteadof or	Error in redeclare (extends Interface)	Use Trait can be resolved using insteadof or
* Note: The names of static member variables/functions cannot be the same as those of common member variables/functions. Otherwise, an error is returned.

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