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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11Flysystem is a PHP library that gives your application a common interface for working with local and remote file storage. Install it with Composer, configure an adapter for the backend you want, wrap that adapter in LeagueFlysystemFilesystem, then use the filesystem API. The abstraction reduces dependence on a provider-specific API, but it does not make every backend’s behavior identical.
What Flysystem abstracts—and what it does not
Flysystem is software for PHP, not a storage service or a physical device. Its adapters connect a shared filesystem API to storage systems such as a local directory, an SFTP server, or cloud object storage. Your application can use the same general operations—such as reading, writing, listing, and deleting—without calling each provider’s API directly. The PHP League describes Flysystem as a file storage library for PHP.
In the architecture, application code works against FilesystemOperator; a Filesystem instance delegates operations to a FilesystemAdapter. The common interface covers frequently needed behavior, not every feature of every backend. The project characterizes this as an “80-20 solution”: provider-specific capabilities and differences may still require separate code. See the architecture documentation.
Install and use Flysystem
For new applications, use the V3 documentation and packages. The getting-started guide uses Composer and demonstrates a local adapter wrapped in a filesystem object:
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composer require league/flysystem:^3.0<?php
$adapter = new LeagueFlysystemLocalLocalFilesystemAdapter(__DIR__ . '/storage');
$filesystem = new LeagueFlysystemFilesystem($adapter);
$filesystem->write('Example.txt', 'Example contents');The local adapter is included with the main package. Remote storage integrations generally require a separate adapter package and any dependencies that package specifies. The exact installation and configuration depend on the backend. The quick-start guide covers the basic setup.
Use Flysystem with AWS S3
To connect to S3, install the Flysystem S3 adapter, provide an S3 client and bucket configuration, then wrap the adapter in Filesystem. Follow the adapter’s current installation and configuration instructions for the package version in your project; its example also documents the IAM actions it needs. See the AWS S3 V3 adapter guide.
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A bucket is not a local directory tree. S3 does not require directories in the same way a local filesystem does, so an operation that creates a directory may not create a corresponding directory object. The shared API helps keep ordinary file operations consistent, but code that relies on directory semantics, permissions, or other provider-specific features should account for the adapter’s behavior.
Which adapters does Flysystem support?
The official project overview lists the following as officially supported adapters. Adapter availability, package instructions, and dependencies can change, so check the project’s current list and the individual adapter guide before choosing one. The overview also distinguishes third-party integrations.
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| Backend or adapter | Typical storage context |
|---|---|
| Local | A directory on the machine running the PHP application |
| FTP | A remote file-transfer server |
| SFTP | A remote file-transfer server accessed through SFTP; the V3 adapter guide describes use of phpseclib version 3 |
| Memory | In-memory storage |
| AWS S3 | Amazon S3 object storage |
| AsyncAws S3 | S3-compatible integration using AsyncAws |
| Google Cloud Storage | Google Cloud object storage |
| Azure Blob Storage | Azure Blob object storage |
| MongoDB GridFS | File storage through MongoDB GridFS |
| WebDAV | A remote storage server using WebDAV |
The project lists Google Drive and Dropbox among third-party adapters rather than the official adapters above. That distinction matters: third-party packages have their own maintainers, installation requirements, and support status.
Common operations and practical limits
The filesystem API includes writing and reading strings or streams, deleting files, listing contents, checking whether a path exists, retrieving metadata, creating directories, changing visibility, and moving or copying files. Consult the API documentation for method signatures and return behavior for your installed V3 version. See the filesystem API reference.
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Use streams for large files
When handling a large file, stream reads and writes instead of loading the whole file into a PHP string. The stream-oriented API can keep memory use low compared with reading all contents at once. Your code still needs to manage the stream resource appropriately. The API reference documents stream operations.
Account for overwrite and directory behavior
Flysystem documents move and copy as deterministic operations that overwrite the destination. If overwriting would be unsafe, check the destination or otherwise enforce your application’s policy before calling the operation. Directory creation is performed when needed on backends that require it; object storage such as S3 may not need a directory-creation operation.
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Do not generalize local symlink rules to remote storage
The local adapter has specific symbolic-link behavior: by default, a listing that encounters a symlink throws, and configuration can instead skip symlinks. Reads follow PHP’s symlink behavior. Those details are local-adapter behavior, not a universal rule for all adapters. See the local adapter documentation.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Build a custom adapter
If no available adapter fits your storage system, implement FilesystemAdapter to map Flysystem operations to that system. Treat this as an integration boundary: your adapter must translate shared operations into the backend’s real semantics, including unsupported operations, errors, paths, and metadata.
- Review the adapter interface and the project’s adapter-development guide.
- Implement the required operations using the storage system’s own API and document any behavior that cannot match the common interface.
- Run the adapter test utilities, then add integration tests against the actual filesystem. The project recommends real-filesystem integration tests as the strongest practical guarantee that an adapter behaves correctly.
Read the custom adapter guide.
Check the V2-to-V3 boundary
New examples should use V3 documentation; older V1 material may describe outdated methods or behavior. The V2/V3 migration guide says V3 is compatible with V2 from a consumption point of view, but custom adapter implementations face a breaking change. It also describes replacing separate update/put methods with write operations, removing plugins, and allowing visibility conversion and path normalization to be customized or replaced. Check the migration guide before upgrading an application that implements its own adapter. See the V2-to-V3 upgrade guide.
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