PHP parent calls parent class constructor_PHP tutorial

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We know that PHP parent is a pointer to the parent class. Generally, we use parent to call the constructor of the parent class.

1. ?php
2. //Base class
3. class Animal
4. {
5. //Attributes of base class
6. public $name; //Name
7. //Constructor of base class
8. public function __construct( $name )
9. {
10. $this->name = $name;
11. }
12. }
13. //Derived class
14. class Person extends Animal
15. //The Person class inherits the Animal class
16. {
17. public $personSex; //Gender
18. public $personAge; //Age
19. //Constructor of inherited class
20. function __construct( $personSex ,
    $personAge )
21. {
22. parent::__construct( "heiyeluren" );
    //Use parent call The constructor of the parent class
23. $this-> personSex = $personSex;
24. $this->personAge = $personAge;
25. }
26. function printPerson( )
27. {
28. print( $this->name. " is " .$this->
    personSex. ",this year " .$this->
    personAge );
29. }
30. }
31. //Instantiate Person object
32. $personObject = new Person( "male", "21");
33. //Perform printing
34. $personObject->printPerson();
35. //Output: heiyeluren is male, this year 21
36. ?>

We pay attention to these few details: member attributes are all public, especially those of the parent class. It is for inherited classes to access through this. We pay attention to the key point, line 25: parent:: __construct( "heiyeluren" ). At this time, we use PHP parent to call the constructor of the parent class to initialize the parent class, because the members of the parent class are all public. , so we can directly use this to call in the inherited class.

http://www.bkjia.com/PHPjc/445967.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/445967.htmlTechArticleEveryone is studying. We know that PHP parent is a pointer to the parent class. Generally, we use parent to call the structure of the parent class. function. ?php //Base class classAnimal { //Attributes of base class public$name...