Core points

• Flysystem provides an abstraction layer for multiple file systems, allowing developers to focus on advanced operations such as read, write, and directory organization without worrying about the details of the underlying storage system.
• Flysystem simplifies the process of switching between different storage systems, making it easier to move or copy data from one system to another without rewriting a lot of application code.
• Flysystem supports a variety of storage systems, including local directories, Dropbox, Amazon S3, Cloud Files, FTP, and SFTP, and treats them all as local systems, making the process of saving files independent of the storage system used.
• Flysystem also provides the functions of managing file visibility, listing files and directories, automatically creating directories, and caching file metadata, further simplifying file management across different storage systems.

Reading and writing files in any programming language is an indispensable aspect, but the underlying implementation may vary greatly. For example, the details of writing data to the local file system vary greatly compared to uploading via FTP – however, conceptually, they are very similar.

Apart from established technologies such as FTP, online storage is becoming more common and inexpensive—there are many services available, such as Dropbox, Amazon’s S3, and Rackspace’s Cloud Files—but they all use slightly different reads and writes Enter method.

This is where Flysystem comes in. It provides an abstraction layer for multiple file systems, meaning you don't have to worry about where the files are, how they are stored, or low-level I/O operations. You only need to focus on advanced operations such as read, write, and directory organization.

This abstraction can also simplify the process of switching from one system to another without rewriting a lot of application code. It also provides a way to move or copy data from one storage system to another without worrying about underlying implementations.

You can use Dropbox, S3, Cloud Files, FTP, or SFTP as you would with your local system; saving files becomes the same process, whether it is saved locally or transferred over the network. You can think of zip compressed files as a bunch of folders without worrying about the details of creating and zipping the compressed files themselves.

Installation and basic usage

As always, Composer is the best way to install:

"league/flysystem": "0.2.*"

You can now simply create one or more instances of LeagueFlysystemFilesysystem by passing in the appropriate adapter.

For example, to use the local directory:

use League\Flysystem\Filesystem;
use League\Flysystem\Adapter\Local as Adapter;

$filesystem = new Filesystem(new Adapter('/path/to/directory'));

To use Amazon S3 buckets, you need a little more configuration:

use Aws\S3\S3Client;
use League\Flysystem\Adapter\AwsS3 as Adapter;

$client = S3Client::factory(array(
    'key'    => '[您的密鑰]',
    'secret' => '[您的密鑰]',
));

$filesystem = new Filesystem(new Adapter($client, 'bucket-name', '可選前綴'));

To use Dropbox:

use Dropbox\Client;
use League\Flysystem\Adapter\Dropbox as Adapter;

$client = new Client($token, $appName);
$filesystem = new Filesystem(new Adapter($client, '可選/路徑/前綴'));

(To get the token and application name, create an application using Dropbox's App Console.)

The following is an example of SFTP – you may not need every option listed here:

"league/flysystem": "0.2.*"

For other adapters such as normal FTP, Predis, or WebDAV, see the documentation.

Read and write to file system

In terms of your application code, you just need to replace calls like file_exists(), fopen()/fclose(), fread/fwrite and mkdir() with their Flysystem equivalents .

For example, the following is an old piece of code that copies the local file to the S3 bucket:

use League\Flysystem\Filesystem;
use League\Flysystem\Adapter\Local as Adapter;

$filesystem = new Filesystem(new Adapter('/path/to/directory'));

With Flysystem, it might look like this:

use Aws\S3\S3Client;
use League\Flysystem\Adapter\AwsS3 as Adapter;

$client = S3Client::factory(array(
    'key'    => '[您的密鑰]',
    'secret' => '[您的密鑰]',
));

$filesystem = new Filesystem(new Adapter($client, 'bucket-name', '可選前綴'));

Note that we are using terms like "read" and "write", "local" and "remote" - advanced abstraction without worrying about creating and destroying file handles.

The following is a summary of the most important methods in the LeagueFlysystemFilesystem class:

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