Members and constants in classes in PHP

Overview of members in a class

Object-oriented programming is the need to do something through an "object" (to accomplish some sort of task);

and

Objects are always derived from classes;

So:

Object-oriented programming, everything begins with a defined class;

the members of the class are divided into 3 categories :

Property:

Method:

Constant:

form, roughly as follows:

class name {

constant definition 1;

constant Definition 2;

.......

attribute definition 1;

attribute definition 2;

........

method definition 1;

method definition 2;

.......

}

Description

Above, there is no order problem; In practice, the constants are put in front, then the attributes, then the methods;

In detail, it is also divided into:

Property:

Common Properties;// general properties, instance properties

static properties;

Method:

common method;// general method, instance method

static method;

Construction method;

Destruction method;

Constant:

class Constants

when a constant is defined in a class, the constant is called a "class constant"-essentially a constant;

definition form:

class name {

Const constant name = constant value;

You cannot use define () to define it!

}

form of Use:

The use of constants is through the class name and is used with the range resolver (::);

class Name:: Constant name ;

Example:

Members and constants in classes in PHP