File system

• File system
• File info

The file library contains classes that assist you with working with the files and the file system.

File system

You can create a new FileSystem object or fetch the instance present in the dependency injection container. In the following examples we'll assume that you'll using the instance from the container.

The has method returns true if the provided path exists and false if not.

$exists = $this->fileSystem->has('/foo/bar.txt');

The isFile method returns true if the provided path is a file and false if not.

$isFile = $this->fileSystem->isFile('/foo/bar.txt');

The isDirectory method returns true if the provided path is a directory and false if not.

$isDirectory = $this->fileSystem->isDirectory('/foo');

The isEmpty method returns true if the provided path is an empty file or directory and false if not.

$isEmpty = $this->fileSystem->isEmpty('/foo');

The isReadable method returns true if the provided path is readable and false if not.

$isReadable = $this->fileSystem->isReadable('/foo/bar.txt');

The isWritable method returns true if the provided path is writable and false if not.

$isWritable = $this->fileSystem->isWritable('/foo/bar.txt');

The lastModified method returns the time (unix timestamp) when the data blocks of a file were being written to, that is, the time when the content of the file was changed.

$lastModified = $this->fileSystem->lastModified('/foo/bar.txt');

The size method returns the size of the file in bytes.

$size = $this->fileSystem->size('/foo/bar.txt');

The extension method returns the extension of the file.

$extension = $this->fileSystem->extension('/foo/bar.txt');

The remove method will delete a file from disk.

$this->fileSystem->remove('/foo/bar.txt');

The glob method returns an array of path names matching the provided pattern.

$paths = $this->fileSystem->glob('/foo/*.txt');

The get method returns the contents of a file.

$contents = $this->fileSystem->get('/foo/bar.txt');

The put method puts the provided contents to the file. There's an optional third parameter that will set an exclusive write lock if set to true.

$this->fileSystem->put('/foo/bar.txt', 'hello, world!');

The prepend method will prepend the provided contents to the file. There's an optional third parameter that will set an exclusive write lock if set to true.

$this->fileSystem->prepend('/foo/bar.txt', 'hello, world!');

The appendContents method will append the provided contents to the file. There's an optional third parameter that will set an exclusive write lock if set to true.

$this->fileSystem->append('/foo/bar.txt', 'hello, world!');

The truncate method will truncate the contents of the file. There's an optional second parameter that will set an exclusive write lock if set to true.

$this->fileSystem->truncate('/foo/bar.txt');

The include method will include a file.

$this->fileSystem->include('/foo/bar.txt');

The includeOnce method will include a file if it hasn't already been included.

$this->fileSystem->includeOnce('/foo/bar.txt');

The require method will require a file.

$this->fileSystem->require('/foo/bar.txt');

The requireOnce method will require a file if it hasn't already been required.

$this->fileSystem->requireOnce('/foo/bar.txt');

The info method will return a FileInfo instance.

$info = $this->fileSystem->info('/foo/bar.txt');

The file method will return a SplFileObject instance.

$file = $this->fileSystem->file('/foo/bar.txt', 'r');

File info

You can create a new FileInfo instance using the constructor or by getting an instance via the FileSystem::info() method. The FileInfo class extends the SplFileInfo class with a set of useful methods that we'll document below.

$info = new FileInfo('/foo/bar.txt');

The getMimeType method will return the MIME type of the file.

$mime = $info->getMimeType();

The getMimeEncoding method will return the MIME encoding of the file.

$encoding = $info->getMimeEncoding();

You can generate a hash based on the contents of the file using the getHash method. The default algorithm is sha256 but you can specify which one you would like to use using the optional first parameter. You can also tell the method to return the hash in its raw binary form by setting the optional second parameter to true.

$hash = $info->getHash();

You can validate a file against a known hash using the validateHash method. If you didn't use the default sha256 algorithm when generating the hash then you'll have to specify which one you used using the optional second parameter. If the hash you're comparing against is provided in its raw binary form then you'll have to set the optional third parameter to true.

$valid = $info->validateHash($hash);

A keyed hash can be generated using the getHmac method. The default algorithm is sha256 but you can specify which one you would like to use using the optional second parameter. You can also tell the method to return the hash in its raw binary form by setting the optional third parameter to true.

$hash = $info->getHmac($key);

You should provide a cryptographically secure key when generating the hash. You can easily generate your own secure keys using the app.generate_key reactor command.

Validating files against the keyed hash is done using the validateHmac method. If you didn't use the default sha256 algorithm when generating the hash then you'll have to specify which one you used using the optional third parameter. If the hash you're comparing against is provided in its raw binary form then you'll have to set the optional fourth parameter to true.

$valid = $info->validateHmac($hash, $key);