Any can explain PHP class and how to use it with double colons (::)

Question

Can anyone explain the PHP classes and what is static what is public, private, etc. And we can use double colons to call the class. Thanks in advance

Answer 1

PHP classes serve the same functionality as classes in other OOP language.It is a collection of variables and methods of a particular kind of object.You can create an object of any class using the 'new' keyword.
Declaring members of a class static make them accessible without an instantiation of the class(i.e by not creating an object of that class). A property declared static cannot be directly accessed within an instance of a class.A static method can be called on a class using the :: symbol.The syntax is:
ClassName::Static_Method_Name(); or ClassName::$static_Propetry;

public,protected and private define the scope of the members of a class.

public
outside code can access this member and extending classes
will also inherit it.
protected
These properties and methods (members) can be referenced only by the object’s class
methods and those of any subclasses.
private
These members can be referenced only by methods within the same class—not by
subclasses.