An SDK, or Software Development Kit, is a collection of software tools and libraries designed to help developers create applications and software. It's essentially a package that provides a set of tools, libraries, relevant documentation, code samples, processes, and guides that allow developers to create software applications on a specific platform.
SDKs are usually designed to be used for specific platforms or programming languages. For example, the Windows SDK is for developing applications for Windows, and the Java SDK is for developing Java applications.
In this artical, we will build a simple SDK for PHP and will post it on Composer.
Composer is a tool for dependency management in PHP. It allows you to declare the libraries your project depends on and it will manage (install/update) them for you.
Packagist is the main Composer repository. It aggregates public PHP packages installable with Composer.
A package is a library that is available for use in your project. The package can be a library that you have written yourself, or a third-party library that you have downloaded using Composer.
A package manager is a tool that automates the process of installing, upgrading, configuring, and removing libraries/packages in a consistent manner. It typically maintains a database of software dependencies and version information to prevent software mismatches and missing prerequisites.
A dependency is a file or library that a program needs to run. For example, if you want to use a library that is written in PHP, you will need to install PHP on your computer. In this case, PHP is a dependency of the library.
A dependency manager is a tool that automates the process of installing, upgrading, configuring, and removing dependencies in a consistent manner. It typically maintains a database of software dependencies and version information to prevent software mismatches and missing prerequisites.
A library is a collection of code that is designed to be used by other programs. It typically contains functions and classes that can be used to perform specific tasks, such as connecting to a database or sending an email.
A framework is a collection of libraries that are designed to work together to provide a complete solution for a specific problem. For example, the Laravel framework is a collection of libraries that are designed to work together to provide a complete solution for building web applications.
Create a new project folder and create a composer.json file in it. The composer.json file is used to define the project dependencies. It is also used to define the project name, version, and description.
{
"name": "umeskia/umeskia-php-sdk",
"description": "A simple PHP SDK",
"version": "1.0.0",
"authors": [
{
"name": "Your Name",
"email": "123@example.com",
"homepage": "https://example.com"
}
],
"require": {}
}Create a new class in the src folder. The class should be named after the package name. For example, if the package name is php-sdk, the class should be named PhpSdk.php.
<?php
namespace PhpSdk;
class PhpSdk
{
public function __construct()
{
echo 'Hello World!';
}
}You can also add a namespace to the class. For example, if the package name is php-sdk, the namespace should be PhpSdk.
And an example folder for testing the SDK and an example file in it. For example, if the package name is php-sdk, the example file should be named index.php.
<?php
require_once __DIR__ . '/../vendor/autoload.php';
use PhpSdk\PhpSdk;
$phpSdk = new PhpSdk();This is the file structure of the project:
php-sdk
├── composer.json
├── example
│ └── index.php
└── src
└── PhpSdk.php
Add the class to the composer.json file. The class should be added to the autoload section. For example, if the package name is php-sdk, the class should be added to the autoload section.
{
"name": "umeskia/umeskia-php-sdk",
"description": "A simple PHP SDK",
"version": "1.0.0",
"authors": [
{
"name": "Your Name",
"email": "123@example.com",
"homepage": "https://example.com"
}
],
"require": {},
"autoload": {
"psr-4": {
"PhpSdk\\": "src/"
}
}
}to verify if the schema is valid, run the following command:
composer validateor read the documentation here
Install the dependencies using Composer. The dependencies are defined in the composer.json file. For example, if the package name is php-sdk, the dependencies are defined in the composer.json file.
composer installTest the SDK by running the example file. For example, if the package name is php-sdk, the example file is located in the example folder.
php example/index.phpPublish the SDK to Packagist. Packagist is the main Composer repository. It aggregates public PHP packages installable with Composer.
To publish the SDK to Packagist, you need to create an account on Packagist click here to create an account.
After creating an account, you need to create a new package on Packagist. To create a new package, click here to create a new package.
add the public repository to the composer.json file. The public repository is used to publish the SDK to Packagist. For example, if the package name is php-sdk, the public repository is used to publish the SDK to Packagist.
Install the SDK using Composer. Composer is a tool for dependency management in PHP. It allows you to declare the libraries your project depends on and it will manage (install/update) them for you.
composer require php-sdk/php-sdkTest the SDK by running the example file. For example, if the package name is php-sdk, the example file is located in the example folder.
php example/index.phpUpdate the SDK using Composer. Composer is a tool for dependency management in PHP. It allows you to declare the libraries your project depends on and it will manage (install/update) them for you.
composer update php-sdk/php-sdkTest the SDK by running the example file. For example, if the package name is php-sdk, the example file is located in the example folder.
php example/index.phpUninstall the SDK using Composer. Composer is a tool for dependency management in PHP. It allows you to declare the libraries your project depends on and it will manage (install/update) them for you.
composer remove php-sdk/php-sdkI published the SDK on Packagist you can test it by running the following command:
composer require umeskia/umeskia-php-sdkTo publish the to production you need to create a tag as follows
git add .
git commit -m "Prepare for stable release"
git tag v1.0.0
git push origin v1.0.0