Php object-oriented – class constants_PHP tutorial

Php object-oriented – class constants

Php object-oriented – class constants

Class constants: In the class, data that remains unchanged during the running cycle is saved.

Definition:

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 qualification modifiers

Visit:

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 are: constants, static properties, non-static properties, static methods, and non-static methods.

Note: $this represents the current object, does it always represent the object of the class where $this belongs?

No, because the value of $this does not depend on the class where $this is located, but depends on the execution object (execution environment) when the method where $this is located is called

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

in the method

$this represents which object.

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