How to create a WordPress plugin using PHP and OOP, with Composer for package management, Symfony components for backend functionality, and Twig for frontend templating.

Here’s a step-by-step guide on how to create a WordPress plugin using PHP and OOP, with Composer for package management, Symfony components for backend functionality, and Twig for frontend templating.

Step 1: Setup

First, you’ll need to create a new WordPress plugin directory in your wp-content/plugins folder. Let's call it my-plugin. Inside this directory, create the following files and folders:

• composer.json: This file will hold our Composer dependencies and configuration.
• src: This folder will hold our plugin's PHP source code.
• templates: This folder will hold our plugin's Twig templates.

Step 2: Composer

Next, let’s set up our Composer configuration. In composer.json, add the following dependencies:

{
  "name": "my-plugin",
  "type": "wordpress-plugin",
  "require": {
    "php": ">=7.4",
    "symfony/http-foundation": "^6.0",
    "twig/twig": "^3.0"
  },
  "autoload": {
    "psr-4": {
      "MyPlugin\\": "src/"
    }
  }
}