Convert to WebP Lite

A simple and efficient WordPress plugin to convert your images to the WebP format for better performance and reduced bandwidth.

Screenshot

Features

• Automatically converts uploaded images from JPG, PNG or GIF to WebP format
• Supports bulk conversion of existing images in the media library
• Keeps original images as backup
• Seamless integration with WordPress media management
• Lightweight and easy to use

Installation

1. Clone or download this repository to your wp-content/plugins directory.
2. Install the dependencies using Composer.
3. Activate the plugin from the WordPress admin dashboard.

Development

This plugin uses Composer for dependency management and provides several useful scripts for development:

# Navigate to the plugin directory
cd wp-content/plugins/convert-to-webp-lite

# Install dependencies
composer install

This will install development dependencies including:

• PHPUnit - Unit testing framework (v9.6+)
• Brain Monkey - WordPress function mocking for tests
• Mockery - Advanced object mocking
• Yoast PHPUnit Polyfills - Cross-version PHPUnit compatibility
• PHP CodeSniffer (PHPCS) - Code quality and WordPress coding standards
• Variable Analysis - Additional code analysis

Testing

The plugin includes a comprehensive test suite with unit tests and integration tests to ensure code quality and reliability.

The test suite uses:

• PHPUnit 9.6+ for the testing framework
• Brain Monkey for mocking WordPress functions in unit tests
• WordPress Test Suite for integration tests with real WordPress environment
• Mockery for advanced object mocking
• Xdebug for code coverage analysis

All tests follow WordPress coding standards and use the Yoast PHPUnit Polyfills for cross-version compatibility.

# Run all tests (unit + integration)
composer run test

# Run only unit tests (262 tests)
composer run phpunit:unit

# Run only integration tests (40 tests)
composer run phpunit:integration

# Generate code coverage report (HTML format)
composer run phpunit:coverage

# Quick test run (unit tests without coverage)
composer run test:quick

The code coverage report is generated in tests/coverage-html/index.html and can be viewed in your browser.

Test Structure:

• tests/unit/ - Unit tests for individual classes and methods
• tests/integration/ - Integration tests for WordPress functionality
• tests/TestCase.php - Base test class with Brain Monkey setup for unit tests
• tests/IntegrationTestCase.php - Base test class extending WP_UnitTestCase for integration tests
• tests/bootstrap.php - Smart test environment initialization (auto-detects test type)

WordPress Test Suite:

Integration tests require the WordPress Test Suite. To install it:

# Run the installation script
bash tests/bin/install-wp-tests.sh wordpress_test root 'root' localhost latest

The installation script will download the WordPress test framework and create a test database.

Code Quality

# Run PHP CodeSniffer to check coding standards
composer run phpcs

# Automatically fix coding standards issues
composer run phpcs:fix

# Generate a summary report
composer run phpcs:report

Autoloading

The plugin uses PSR-4 autoloading for better code organization:

• Namespace: ConvertToWebpLite\
• Classes are located in the includes/ directory

Usage

• New images uploaded to the media library will be automatically converted to WebP.
• To convert existing images, go to the plugin settings page and use the bulk conversion tool.
• The original images are preserved for compatibility purpose

Requirements

End Users

• PHP 7.4 or higher
• WordPress 5.0 or higher
• The PHP GD or Imagick extension with WebP support enabled

Contributors & Developers

• PHP 7.4 or higher
• Composer for dependency management
• WordPress 5.0 or higher
• The PHP GD or Imagick extension with WebP support enabled
• Xdebug for code coverage (optional but recommended)
• MySQL or MariaDB for integration tests
• Subversion (SVN) for WordPress Test Suite installation

License

This project is open source and available under the GPL-3.0 License.

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Special thanks to Romain Preston for his help, code review and insightful comments

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Developed by Pierre Hunout
Email: pierre.hunout@gmail.com
Support: Buy me a coffee ☕