Defines a "managed_file" Form API field and a "file" field for Field module. File core/modules/file/file

public FileSystemInterface::tempnam($directory, $prefix)

file_validate_extensions(FileInterface $file, $extensions) Checks that the filename ends with an allowed extension

public File::setFilename($filename) Sets

_views_file_status($choice = NULL) Formats human-readable version of file status.

Defines a MIME type guesser that also supports stream wrapper paths. Hierarchy class

public FileUsageBase::add(FileInterface $file, $module, $type

public FileInterface::isTemporary() Returns

public File::getMimeType() Returns the

public FileSystemInterface::uriScheme($uri)