PHP Object-Class constants

PHP Object-Class constants

Class constants: In a class, save unchanged data in the running cycle.

Defined:

const keyword

const constant NAME = constant value

Example:

Class Student

{

Public $stu _id;

Public $stu _name;

Public $stu _gender;

Const Gender_male = ' Male ';

Const Gender_female = ' female ';

}

Class constants are not restricted by access-qualified modifiers

Access:

Class:: Constant Name

Example:

Class Student

{

Public $stu _id;

Public $stu _name;

Public $stu _gender;

Const Gender_male = ' Male ';

Const Gender_female = ' female ';

Public function __construct ($id, $name, $gender = ')

{

$this->stu_id= $id;

$this->stu_name= $name;

$this->gender= ($gender = = ") Self::gender_male: $gender;

}

}

Summary: The members that can be defined in a class, altogether: constants, static properties, Non-static properties, static methods, and Non-static methods.

Note: $this represents the current object, always representing the object of the $this's class?

No, because the value of the $this does not depend on the class in which the $this resides, but on the execution object (execution Environment) when the method is invoked $this.

The execution environment of the method, the current method is executed in the context of which object, the

$this represents which object.