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In my blog, I delve into the world of programming web technologies, Linux, Unix-like, and graphic design using free tools on Linux.

Saturday, August 10, 2024

Composer

Composer is a powerful tool designed for managing and installing packages for the PHP programming language. It operates similarly to npm for JavaScript or the pacman package manager for Linux, enabling users to effortlessly install PHP libraries and tools directly from the command line. With Composer, developers can easily manage dependencies, ensuring their projects are up-to-date and well-organized.

In this text, I will focus solely on the aspects that I personally consider important.

Where are the packages?

Packagist is a site where you can find Composer packages. There we can search and add our own scripts or projects.

How do we install the package?

Let's create a directory and open a terminal in it. For example, let's install the milon/barcode package:

🚀 composer require milon/barcode

...and this looks like:

How do we add library to our code?

Let's make 'index.php' and in it:

<?php

require __DIR__ . "/vendor/autoload.php";
use \Milon\Barcode\DNS1D;

$d = new DNS1D();
$d->setStorPath(__DIR__.'/cache/');
echo $d->getBarcodeHTML('9780691147727', 'EAN13');

Open the PHP dev-server with:

php -S localhost:9999

How to make a Composer project?

Let's prepare the project structure:

mkdir ./rex
cd ./rex

We create 'composer.json' with the command 'composer init'. Press [Enter] on all questions:

composer init

Let's create 'index.php':

touch ./rex/index.php

With data:

<?php

require __DIR__ . "/vendor/autoload.php";

use Ddd\Rex\Dog;

$pas = new Dog(); 
$pas->bark();

Then we create a test class in the 'src' directory:

touch ./src/Dog.php

Enter in the file 'Dog.php':

<?php

namespace Ddd\Rex;

class Dog
{
    function bark()
    {
        echo "Bark!";        
    }
}

And finally, to restore the Composer autoload list (we must be in the project root path, where 'composer.json' is also):

composer dump-autoload

We reopen (shut down the one from before) the PHP dev-server with:

php -S localhost:9999

If everything is ok, "Bark" will be displayed.

posted by damirs @ August 10, 2024