# Filesystem

- Introduction
- Installing/Configuring
  - Requirements
  - Installation
  - Runtime Configuration
  - Resource Types
- Predefined Constants
- Filesystem Functions
  - basename — Returns trailing name component of path
  - chgrp — Changes file group
  - chmod — Changes file mode
  - chown — Changes file owner
  - clearstatcache — Clears file status cache
  - copy — Copies file
  - delete — See unlink or unset
  - dirname — Returns a parent directory's path
  - disk_free_space — Returns available space on filesystem or disk partition
  - disk_total_space — Returns the total size of a filesystem or disk partition
  - diskfreespace — Alias of disk_free_space
  - fclose — Closes an open file pointer
  - feof — Tests for end-of-file on a file pointer
  - fflush — Flushes the output to a file
  - fgetc — Gets character from file pointer
  - fgetcsv — Gets line from file pointer and parse for CSV fields
  - fgets — Gets line from file pointer
  - fgetss — Gets line from file pointer and strip HTML tags
  - file_exists — Checks whether a file or directory exists
  - file_get_contents — Reads entire file into a string
  - file_put_contents — Write data to a file
  - file — Reads entire file into an array
  - fileatime — Gets last access time of file
  - filectime — Gets inode change time of file
  - filegroup — Gets file group
  - fileinode — Gets file inode
  - filemtime — Gets file modification time
  - fileowner — Gets file owner
  - fileperms — Gets file permissions
  - filesize — Gets file size
  - filetype — Gets file type
  - flock — Portable advisory file locking
  - fnmatch — Match filename against a pattern
  - fopen — Opens file or URL
  - fpassthru — Output all remaining data on a file pointer
  - fputcsv — Format line as CSV and write to file pointer
  - fputs — Alias of fwrite
  - fread — Binary-safe file read
  - fscanf — Parses input from a file according to a format
  - fseek — Seeks on a file pointer
  - fstat — Gets information about a file using an open file pointer
  - ftell — Returns the current position of the file read/write pointer
  - ftruncate — Truncates a file to a given length
  - fwrite — Binary-safe file write
  - glob — Find pathnames matching a pattern
  - is_dir — Tells whether the filename is a directory
  - is_executable — Tells whether the filename is executable
  - is_file — Tells whether the filename is a regular file
  - is_link — Tells whether the filename is a symbolic link
  - is_readable — Tells whether a file exists and is readable
  - is_uploaded_file — Tells whether the file was uploaded via HTTP POST
  - is_writable — Tells whether the filename is writable
  - is_writeable — Alias of is_writable
  - lchgrp — Changes group ownership of symlink
  - lchown — Changes user ownership of symlink
  - link — Create a hard link
  - linkinfo — Gets information about a link
  - lstat — Gives information about a file or symbolic link
  - mkdir — Makes directory
  - move_uploaded_file — Moves an uploaded file to a new location
  - parse_ini_file — Parse a configuration file
  - parse_ini_string — Parse a configuration string
  - pathinfo — Returns information about a file path
  - pclose — Closes process file pointer
  - popen — Opens process file pointer
  - readfile — Outputs a file
  - readlink — Returns the target of a symbolic link
  - realpath_cache_get — Get realpath cache entries
  - realpath_cache_size — Get realpath cache size
  - realpath — Returns canonicalized absolute pathname
  - rename — Renames a file or directory
  - rewind — Rewind the position of a file pointer
  - rmdir — Removes directory
  - set_file_buffer — Alias of stream_set_write_buffer
  - stat — Gives information about a file
  - symlink — Creates a symbolic link
  - tempnam — Create file with unique file name
  - tmpfile — Creates a temporary file
  - touch — Sets access and modification time of file
  - umask — Changes the current umask
  - unlink — Deletes a file