(PHP 4, PHP 5, PHP 7) Gets file type string filetype

(PECL xdiff >= 1.5.0) Make binary diff of two strings using the Rabin's polynomial fingerprinting algorithm

(PHP 4, PHP 5, PHP 7) Returns the target of a symbolic link

(PHP >= 5.3.0, PECL fileinfo >= 0.1.0) Set libmagic configuration options

(PHP 5 >= 5.1.2, PHP 7) Changes user ownership of symlink

(PECL xattr >= 0.9.0) Get a list of extended attributes

(PHP 4 >= 4.3.0, PHP 5, PHP 7) Match filename against a pattern

(PECL xdiff >= 0.2.0) Patch a file with an unified diff

(PHP 4, PHP 5, PHP 7) Gets file size int filesize

(PECL xattr >= 1.0.0) Check if filesystem supports extended attributes