Aliasing with as keyword in PHP - Mini Project: Build & Apply

Aliasing with as keyword in PHP

📖 Scenario: Imagine you are organizing a small library system. You have two classes named Book and Magazine in different namespaces. To use both classes in your main script without confusion, you will use aliasing with the as keyword.

🎯 Goal: You will create two classes in separate namespaces, then import them into a single PHP script using aliasing with the as keyword. Finally, you will create objects from these aliased classes and print their types.

📋 What You'll Learn

Create two namespaces: Library\Books and Library\Magazines

Define a class Book inside Library\Books namespace

Define a class Magazine inside Library\Magazines namespace

Use use statements with as keyword to alias these classes in the main script

Create objects from the aliased classes and print their class names

💡 Why This Matters

🌍 Real World

In large PHP projects, many classes may have the same name but live in different namespaces. Aliasing with the <code>as</code> keyword helps developers use these classes clearly without confusion.

💼 Career

Understanding namespaces and aliasing is important for PHP developers working on complex applications, frameworks, or libraries where code organization and avoiding name clashes are critical.

1

Create namespaces and classes

Create two namespaces: Library\Books and Library\Magazines. Inside Library\Books, create a class called Book with an empty body. Inside Library\Magazines, create a class called Magazine with an empty body.

PHP

<?php

// Define namespace Library\Books and class Book
// Define namespace Library\Magazines and class Magazine
// Your code here

Need a hint?

Use the namespace keyword to create namespaces. Define classes inside curly braces after the namespace.

2

Import classes with aliasing

In the global namespace, use use statements to import Library\Books\Book as Novel and Library\Magazines\Magazine as Periodical.

PHP

<?php

namespace Library\Books {
    class Book {
        // Empty class
    }
}

namespace Library\Magazines {
    class Magazine {
        // Empty class
    }
}

// Use aliasing to import classes
// Your code here

Need a hint?

Use the syntax use Namespace\Class as Alias; to create an alias.

3

Create objects from aliased classes

Create an object called $myNovel from the aliased class Novel and an object called $myPeriodical from the aliased class Periodical.

PHP

<?php

namespace Library\Books {
    class Book {
        // Empty class
    }
}

namespace Library\Magazines {
    class Magazine {
        // Empty class
    }
}

use Library\Books\Book as Novel;
use Library\Magazines\Magazine as Periodical;

// Create objects from aliased classes
// Your code here

Need a hint?

Create objects using the new keyword and the alias names.

4

Print class names of objects

Use echo to print the class name of $myNovel and $myPeriodical using the get_class() function. Print each class name on a new line.

PHP

<?php

namespace Library\Books {
    class Book {
        // Empty class
    }
}

namespace Library\Magazines {
    class Magazine {
        // Empty class
    }
}

use Library\Books\Book as Novel;
use Library\Magazines\Magazine as Periodical;

$myNovel = new Novel();
$myPeriodical = new Periodical();

// Print class names of objects
// Your code here

Need a hint?

Use get_class($object) to get the full class name including namespace. Use echo to print it. Add a newline with "\n".