PHP parent calls the parent class Constructor

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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 the base class
6. Public $ name; // name
7. // Constructor of the 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 the inherited class
20. Function _ construct ($ personSex,
    $ PersonAge)
21. {
22. Parent: :__ construct ("heiyeluren ");
    // Use parent to 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 the Person object
32. $ PersonObject = new Person ("male", "21 ");
33. // Execute print
34. $ PersonObject->PrintPerson ();
35. // Output: heiyeluren is male, this year 21
36. ?>

We should pay attention to the following details: the member attributes are all public, especially the parent class, to be accessed by the inheritance class through this. Note the key points. Row 25th: parent: _ construct ("heiyeluren "), at this time, we will 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, therefore, we can directly use this to call the inheritance class.