Flag for dealing with existing files: Do nothing and return FALSE. Related topics
Default mode for new directories. See drupal_chmod()
file_create_filename($basename, $directory) Creates a full file path from a directory and filename.
file_url_transform_relative($file_url) Transforms an absolute URL of a local file to a relative URL.
file_scan_directory($dir, $mask, $options = array(), $depth = 0) Finds all files that match a given mask in
file_directory_os_temp() Discovers a writable system-appropriate temporary directory. Return
API for handling file uploads and server file management. File core/includes/file.inc
drupal_unlink($uri, $context = NULL) Deletes a file.
file_build_uri($path) Constructs a URI to Drupal's default files location given a relative path.
Default mode for new files. See drupal_chmod()
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