Flysystem is a PHP library that provides a unified filesystem abstraction layer. It offers a simple and consistent API for interacting with various file storage systems, including local filesystems, cloud storage services, and more. Flysystem allows developers to write filesystem-agnostic code, making it easier to switch between different storage backends.

Pros

• Consistent API across multiple storage adapters
• Easy to switch between different storage backends without changing application code
• Extensive adapter support for popular storage services (e.g., Amazon S3, Azure Blob Storage, Google Cloud Storage)
• Actively maintained and well-documented

Cons

• Additional abstraction layer may introduce slight performance overhead
• Some advanced features of specific storage systems may not be accessible through the abstraction
• Learning curve for developers unfamiliar with the concept of filesystem abstraction

Code Examples

1. Basic file operations:

use League\Flysystem\Filesystem;
use League\Flysystem\Local\LocalFilesystemAdapter;

$adapter = new LocalFilesystemAdapter('/path/to/root');
$filesystem = new Filesystem($adapter);

// Write a file
$filesystem->write('path/to/file.txt', 'Contents');

// Read a file
$contents = $filesystem->read('path/to/file.txt');

// Delete a file
$filesystem->delete('path/to/file.txt');

2. Using cloud storage (Amazon S3):

use League\Flysystem\AwsS3V3\AwsS3V3Adapter;
use League\Flysystem\Filesystem;
use Aws\S3\S3Client;

$client = new S3Client([
    'credentials' => [
        'key'    => 'your-key',
        'secret' => 'your-secret',
    ],
    'region' => 'your-region',
    'version' => 'latest',
]);

$adapter = new AwsS3V3Adapter($client, 'your-bucket-name');
$filesystem = new Filesystem($adapter);

// Upload a file to S3
$filesystem->write('path/to/file.txt', 'Contents');

3. Listing directory contents:

use League\Flysystem\Filesystem;
use League\Flysystem\Local\LocalFilesystemAdapter;

$adapter = new LocalFilesystemAdapter('/path/to/root');
$filesystem = new Filesystem($adapter);

// List all files in a directory
$contents = $filesystem->listContents('path/to/directory', false);

foreach ($contents as $item) {
    echo $item->path() . "\n";
}

Getting Started

To start using Flysystem, install it via Composer:

composer require league/flysystem

Then, create a filesystem instance with the desired adapter:

use League\Flysystem\Filesystem;
use League\Flysystem\Local\LocalFilesystemAdapter;

$adapter = new LocalFilesystemAdapter('/path/to/root');
$filesystem = new Filesystem($adapter);

// Now you can use $filesystem to perform file operations
$filesystem->write('example.txt', 'Hello, Flysystem!');