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Mastering PHP 7

You're reading from   Mastering PHP 7 Design, configure, build, and test professional web applications

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Product type Paperback
Published in Jun 2017
Publisher Packt
ISBN-13 9781785882814
Length 536 pages
Edition 1st Edition
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Concepts
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Author (1):
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Branko Ajzele Branko Ajzele
Author Profile Icon Branko Ajzele
Branko Ajzele
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Table of Contents (18) Chapters Close

Preface 1. The All New PHP FREE CHAPTER 2. Embracing Standards 3. Error Handling and Logging 4. Magic Behind Magic Methods 5. The Realm of CLI 6. Prominent OOP Features 7. Optimizing for High Performance 8. Going Serverless 9. Reactive Programming 10. Common Design Patterns 11. Building Services 12. Working with Databases 13. Resolving Dependencies 14. Working with Packages 15. Testing the Important Bits 16. Debugging, Tracing, and Profiling 17. Hosting, Provisioning, and Deployment

Using __destruct()

Alongside the constructor, the destructor is a common feature of the OO language. The __destruct() magic method represents this concept. The method gets triggered as soon as there are no other references to a particular object. This can happen either when PHP decides to explicitly free the object, or when we force it using the unset()  language construct.

As with constructors, parent destructors don't get called implicitly by PHP. In order to run a parent destructor, we need to explicitly call parent::__destruct(). Furthermore, the child class inherits the parent's destructor if it does not implement one for itself.

Let's say we have a following simple User class:

<?php

class User
{
public function __destruct()
{
echo '__destruct';
}
}

With the User class in place, let's go ahead and look...

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