PHP Object-oriented-class constants _php Tutorial

PHP Object-oriented-class constants

PHP Object-oriented-class constants

Class constants: A class that holds unchanged data for the duration of a run.

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: Members that can be defined in a class: constants, static properties, non-static properties, static methods, non-static methods.

Note: $this represents the current object and always represents the object of the class where $this is located?

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

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

$this represents which object.

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