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Learning PHP 7

You're reading from   Learning PHP 7 Build powerful real-life web applications in a simple way using PHP7 and its ecosystem.

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Product type Paperback
Published in Mar 2016
Publisher Packt
ISBN-13 9781785880544
Length 414 pages
Edition 1st Edition
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Author (1):
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Antonio L Zapata (GBP) Antonio L Zapata (GBP)
Author Profile Icon Antonio L Zapata (GBP)
Antonio L Zapata (GBP)
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Table of Contents (12) Chapters Close

Preface 1. Setting Up the Environment 2. Web Applications with PHP FREE CHAPTER 3. Understanding PHP Basics 4. Creating Clean Code with OOP 5. Using Databases 6. Adapting to MVC 7. Testing Web Applications 8. Using Existing PHP Frameworks 9. Building REST APIs 10. Behavioral Testing Index

Arrays


If you have some experience with other programming languages or data structures in general, you might be aware of two data structures that are very common and useful: lists and maps. A list is an ordered set of elements, whereas a map is a set of elements identified by keys. Let's see an example:

List: ["Harry", "Ron", "Hermione"]

Map: {
  "name": "James Potter",
  "status": "dead"
}

The first element is a list of names that contains three values: Harry, Ron, and Hermione. The second one is a map, and it defines two values: James Potter and dead. Each of these two values is identified with a key: name and status respectively.

In PHP, we do not have lists and maps; we have arrays. An array is a data structure that implements both, a list and a map.

Initializing arrays

You have different options for initializing an array. You can initialize an empty array, or you can initialize an array with data. There are different ways of writing the same data with arrays too. Let's see some examples...

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