basename() Returns the filename component of a path. chgrp() Changes the file group. chmod() Changes the file mode. chown() Changes the file owner. clearstatcache() Clears the file status cache. copy() Copies a file. delete() See unlink() or unset() dirname() Returns the path of the parent directory. 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() Returns available space on filesystem or disk partition. Alias of disk_free_space() fclose() Closes an open file pointer. feof() Tests for end-of-file on a file pointer. fflush() Flushes the buffered output to a file. fgetc() Returns a character from file pointer. fgetcsv() Gets line from file pointer and parse for CSV fields. fgets() Read a specific number of bytes from a file. fgetss() Reads a specific number of bytes from a file and strip HTML tags and PHP code. file() Reads entire file into an array. file_exists() Checks whether a file or directory exists. file_get_contents() Reads entire file into a string. file_put_contents() Write a string to a file. fileatime() Returns the last access time of a file. filectime() Returns the last change time of a file. filegroup() Returns the group ID of a file. fileinode() Returns the inode number of the file. filemtime() Returns the last modification time of a file. fileowner() Returns the user ID of the owner of the file. fileperms() Returns permissions for the file. filesize() Returns the file size. filetype() Returns the file type. flock() Locks or releases a file. fnmatch() Matches a filename or string against a specified pattern. fopen() Opens a 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() Reads a specific number of bytes from a file. fscanf() Parses input from a file according to a specified format. fseek() Seeks on a file pointer. fstat() Returns 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() Writes the contents of string to the file pointer. glob() Returns an array of filenames/directories matching a specified pattern. is_dir() Checks whether the file is a directory. is_executable() Checks whether the file is executable. is_file() Checks whether the file is a regular file. is_link() Checks whether the filename is a symbolic link. is_readable() Checks whether a file exists and is readable. is_uploaded_file() Checks whether the file was uploaded via HTTP POST. is_writable() Checks 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() Returns information about a link. lstat() Returns information about a file or symbolic link. mkdir() Creates a 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() Reads a file and writes it to the output buffer. readlink() Returns the target of a symbolic link. realpath() Returns canonicalized absolute pathname. realpath_cache_get() Returns realpath cache entries. realpath_cache_size() Returns realpath cache size. rename() Renames a file or directory. rewind() Rewind the position of a file pointer. rmdir() Removes an empty directory. set_file_buffer() Sets the buffer size of a file. stat() Returns information about a file. symlink() Creates a symbolic link. tempnam() Create temporary file with unique file name. tmpfile() Creates a unique temporary file. touch() Sets access and modification time of file. umask() Changes the current umask. unlink() Deletes a file.