Thumbnail

On-the-fly thumbnail generation and caching for WordPress. A modern fork of Kama Thumbnail with WebP support, PSR-4 architecture, and both legacy (kama_thumb_*) and modern (thumb_*) APIs.

Requirements

Features

• On-the-fly thumbnails — resize and crop images with filesystem caching
• WebP output — optional WebP generation when supported by the server
• Smart source resolution — featured image, first content image, attachments, or custom source
• Admin settings — quality, format, cache directory, placeholder image
• Dual API — modern thumb_* functions and legacy kama_thumb_* aliases
• Filters — get_post_thumbnail and other hooks for integration with term covers and themes
• PSR-4 architecture — domain/application/infrastructure layers with Pest tests

Installation

From Git (submodule)

git submodule add git@github.com:tikhomirov/wp-thumbnail-plugin.git wp-content/plugins/wp-thumbnail-plugin

Manual

1. Download the latest release.
2. Upload to wp-content/plugins/wp-thumbnail-plugin/.
3. Activate Thumbnails in WordPress admin.
4. Configure options under Settings → Thumbnails.

Composer (inside the plugin)

cd wp-content/plugins/wp-thumbnail-plugin
composer install

Usage

Get thumbnail URL

$url = thumb_src([
    'width'  => 480,
    'height' => 340,
    'crop'   => true,
]);

// With explicit source (attachment ID or URL)
$url = thumb_src([
    'width'  => 300,
    'height' => 200,
], get_post_thumbnail_id());

Output <img> tag

echo thumb_img([
    'width'  => 480,
    'height' => 340,
    'crop'   => true,
    'class'  => 'img-fluid rounded',
    'alt'    => 'Image description',
]);

Output linked image

echo thumb_a_img([
    'width'  => 480,
    'height' => 340,
    'crop'   => true,
]);

Arguments

Legacy API

For backward compatibility with Kama Thumbnail themes and snippets:

• kama_thumb_src()
• kama_thumb_img()
• kama_thumb_a_img()

Development

composer install
composer test          # Pest unit + integration tests
composer test:coverage
composer phpstan
composer lint
composer quality       # phpstan + lint

Architecture

wp-thumbnail-plugin/
├── wp-thumbnail-plugin.php       # Bootstrap, constants
├── autoload.php
├── src/
│   ├── Application/
│   │   └── ThumbnailService.php  # Orchestration
│   ├── Domain/
│   │   ├── Contracts/            # Storage, ImageProcessor interfaces
│   │   ├── Services/             # ThumbnailGenerator
│   │   └── ValueObjects/         # ThumbnailProfile, ImageSource
│   └── Infrastructure/
│       ├── ImageProcessors/      # GD, Imagick
│       ├── Storage/              # FileSystemStorage
│       └── WordPress/            # Plugin, Settings, TemplateFunctions
├── views/admin/                  # Settings page
├── assets/js/                    # Admin scripts
└── tests/                        # Pest tests

Template functions (thumb_src, thumb_img, thumb_a_img) are registered by TemplateFunctions and delegate to ThumbnailService.

Changelog

See CHANGELOG.md.

License

GPL-2.0-or-later

Author

Aleksey Tikhomirov — rwsite.ru

Русский

WP Thumbnails — плагин для генерации и кэширования миниатюр «на лету» в WordPress. Современный форк Kama Thumbnail с WebP, PSR-4 и двумя API.

Совместимость

• WordPress: от 5.6, протестировано на 6.6 – 6.9
• PHP: от 7.4, протестировано на 7.4, 8.0 – 8.4
• Библиотека изображений: GD или Imagick

Что умеет

• Генерация и кэширование миниатюр с обрезкой и изменением размера
• WebP при поддержке сервером
• Поиск исходника: featured image, первое изображение в контенте, вложения
• Настройки в Настройки → Thumbnails
• Современный API (thumb_*) и legacy (kama_thumb_*)
• Фильтр get_post_thumbnail для интеграции с обложками терминов

Установка

Скачайте релиз или подключите как git submodule. После активации настройте параметры в админке.

Пример в шаблоне темы

<?php echo thumb_img([
    'width'  => 480,
    'height' => 340,
    'crop'   => true,
    'class'  => 'img-fluid',
]); ?>