How to use the constructor in php inheritance

This article is about how constructors in php inheritance are used. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

Constructor in php inheritance

Description:

If the subclass has a constructor, it calls the subclass, and if the subclass does not have a constructor, the parent constructor is called.

After the subclass constructor is called, the parent constructor is not called by default.

Syntax:

Call the constructor through the class name

Class name:: _ _ construct ()

Note: the parent keyword indicates the name of the parent class, which can reduce the coupling of the program.

/ / the constructor in inheritance class Person {public function _ construct () {echo 'this is the parent class;}} class Student extends Person {public function _ _ construct () {echo' this is a subclass';}} $stu = new Student () / / the constructor in inheritance class Person {public function _ construct () {echo 'this is the parent class';}} class Student extends Person {public function _ _ construct () {Person::__construct (); / / call the parent constructor echo 'this is a subclass';}} $stu = new Student () / / the constructor in inheritance class Person {public function _ construct () {echo 'this is the parent class;}} class Student extends Person {public function _ construct () {parent::__construct (); / / write low coupling echo' this is a subclass';}} $stu = new Student ()

List of questions:

Class Person {protected $name; protected $sex; public function _ _ construct ($name,$sex) {$this- > name = $name; $this- > sex = $sex;}} class Student extends Person {private $score; public function _ construct ($name,$sex,$score) {parent::__construct ($name,$sex); $this- > score = $score } public function getInfo () {echo "name: {$this- > name}"; echo "surname: {$this- > sex}"; echo "score: {$this- > score}";}} $stu = new Student ('qingyu',' male', '128'); var_dump ($stu). Thank you for reading! This is the end of this article on "how to use the constructor in php inheritance". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, you can share it out for more people to see!