🧠🎨 AiGenerateImageByReference

A PHP library to generate images in the style of a reference image using the OpenAI Image API.

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⚙️ Installation

composer require kdosiodjinud/ai-generate-image-by-reference

Requires PHP 8.1+, guzzlehttp/guzzle, and psr/log.

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🚀 Usage

use AiGenerateImageByReference\AiGenerateImageByReference;
use Monolog\Logger;
use Monolog\Handler\StreamHandler;

$apiKey = 'sk-...';

$logger = new Logger('ai');
$logger->pushHandler(new StreamHandler('php://stdout'));

$ai = new AiGenerateImageByReference($apiKey, $logger);

$generatedImageBase64 = $ai
    ->setStyleImage('/path/to/reference-style.png') // reference image for style
    ->addContentImage('/path/to/content-image.png', 'Add glasses to the person') // content with description
    ->generate('A sunny outdoor scene with the person reading a book.');

if ($generatedImageBase64) {
    file_put_contents('output.png', base64_decode($generatedImageBase64));
}

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🔧 Advanced Usage (Custom HTTP Client)

You can pass a custom Guzzle client (e.g. with a mock handler for testing):

use GuzzleHttp\Client;

$customClient = new Client([...]);
$ai = new AiGenerateImageByReference($apiKey, $logger, $customClient);

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🧰 Options ($options)

Pass an options array to generate():

Key	Description	Default Value
MODEL	OpenAI model	gpt-image-1
SIZE	Image size (1024x1024, etc.)	1024x1024
N	Number of images	1
BACKGROUND	Background (transparent, opaque, auto)	transparent

Unknown keys will be ignored with a warning if logger is set.

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🧪 Running Tests

composer install
vendor/bin/phpunit

All tests live in tests/ and are PSR-4 autoloaded.
Uses Guzzle's MockHandler for full offline test coverage.

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🧼 Code Style

This project uses PHP-CS-Fixer with strict PSR-12 rules.

▶️ Run it

vendor/bin/php-cs-fixer fix

💡 If you're on PHP 8.4 (or fighting entropy), run it with:

PHP_CS_FIXER_IGNORE_ENV=1 vendor/bin/php-cs-fixer fix

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🧠 How It Works

• First image set via setStyleImage() defines the visual style.
• Additional images via addContentImage() define the content (e.g. characters).
• Prompt describes final composition.
• Uses multipart/form-data to call OpenAI API.
• Returns base64-encoded image.

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📦 Requirements

• PHP 8.1+
• OpenAI API key with image generation access
• guzzlehttp/guzzle
• (optional) psr/log for logging

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📬 Want to contribute?

Sure, fork it. Or open a PR.
Or just write a poem about AI and post it on your fridge. We approve.

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☕ License

MIT. Hack it, fork it, print it on a mug.

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🧪 Real-World Example

<?php

declare(strict_types=1);

namespace App\OpenAi\Tool;

require_once __DIR__ . '/vendor/autoload.php';

use AiGenerateImageByReference\AiGenerateImageByReference;
use Monolog\Handler\StreamHandler;
use Monolog\Logger;

$apiKey = 'sk-your-real-key';

$logger = new Logger('ai');
$logger->pushHandler(new StreamHandler('php://stdout'));

$ai = new AiGenerateImageByReference($apiKey, $logger);

$generatedImageBase64 = $ai
    ->setStyleImage('style.png')
    ->addContentImage('tyna.png', 'girl named Tina')
    ->addContentImage('fredy.png', 'boy named Fredy')
    ->generate('Fredy and Tina in a park on a sunny day with blue sky – Fredy is riding a bicycle');

if ($generatedImageBase64) {
    file_put_contents('output.png', base64_decode($generatedImageBase64));
}