The inheritance method of Php constructor _php skill

Source: Internet
Author: User

This example describes the inheritance method of the PHP constructor. Share to everyone for your reference. Specifically as follows:

in the first case: When a subclass does not define a constructor, the default inheritance. Example:

<?php
class a{public
 $name;
 function __construct () {
 echo $this->name= "cockroach";
 }
}
Class B extends a{
 
}
$bb = new B ();
? >

Output result: Xiao Qiang

in the second case: subclasses define constructors, they are not inherited. Example:

<?php
class a{public
 $name;
 function __construct () {
 echo $this->name= "cockroach";
 }
}
Class B extends a{
 function __construct () {
 echo "bbbbbb subclass";
 }
}
$BB = new B ();
? >

Output Result: BBBBBB Subclass

Third scenario: If you need to invoke the constructor of the parent class, you can use: Parent:: Parents class function or parent class Name:: Parent class function.

I hope this article will help you with your PHP program design.

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.