PHP Filesystem

Name

Default

Description

Changeable

allow_url_fopen

“1”

Enables fopen()-type functions to operate with URLs.

PHP_INI_SYSTEM

allow_url_include

“0”

(available starting from PHP 5.2)

PHP_INI_SYSTEM

user_agent

NULL

Specifies the user agent that PHP should use when sending requests (available since PHP 4.3).

PHP_INI_ALL

default_socket_timeout

“60”

Sets the default timeout, in seconds, for socket-based streams (available since PHP 4.3).

PHP_INI_ALL

from

“”

Specifies the email address to use for unauthenticated FTP connections and in the From header for HTTP connections when using FTP and HTTP wrappers.

PHP_INI_ALL

auto_detect_line_endings

“0”

When set to “1”, PHP will check the data read by fgets() and file() to determine whether it uses Unix, MS-Dos, or Mac line-ending characters (available since PHP 4.3).

PHP_INI_ALL

sys_temp_dir

“”

(available starting from PHP 5.5)

PHP_INI_SYSTEM

Function

Description

basename()

Returns the filename part of a path.

chgrp()

Modifies the file’s group.

chmod()

Modifies the file’s mode.

chown()

Updates the file owner.

clearstatcache()

Clears the file status cache.

copy()

Duplicates a file.

delete()

Refer to unlink().

dirname()

Returns the directory name part of a path.

disk_free_space()

Returns the available space on a filesystem or disk.

disk_total_space()

Returns the total capacity of a filesystem or disk.

diskfreespace()

An alias for disk_free_space().

fclose()

Closes an open file.

feof()

Checks if the end-of-file (EOF) has been reached for an open file.

fflush()

Flushes buffered output to an open file.

fgetc()

Returns a single character from an open file.

fgetcsv()

Returns a line from an open CSV file.

fgets()

Returns a line from an open file.

fgetss()

Deprecated as of PHP 7.3. Returns a line from an open file with HTML and PHP tags removed.

file()

Reads the contents of a file into an array.

file_exists()

Checks if a file or directory exists.

file_get_contents()

Reads the contents of a file into a string.

file_put_contents()

Writes data to a file.

fileatime()

Returns the last access time of a file.

filectime()

Returns the last modification time of a file.

filegroup()

Returns the group ID associated with a file.

fileinode()

Returns the inode number of a file.

filemtime()

Returns the last modification time of a file.

fileowner()

Returns the user ID (owner) of a file.

fileperms()

Returns the permissions of the file.

filesize()

Returns the size of the file.

filetype()

Returns the type of the file.

flock()

Locks or unlocks a file.

fnmatch()

Compares a filename or string to a specified pattern.

fopen()

Opens a file or URL.

fpassthru()

Reads from the current position in a file until EOF and writes the output to the buffer.

fputcsv()

Formats a line as CSV and writes it to an open file.

fputs()

A synonym for fwrite().

fread()

Reads from an open file in a binary-safe manner.

fscanf()

Parses input from an open file based on a specified format.

fseek()

Moves the file pointer to a specified position in an open file.

fstat()

Provides details about an open file.

ftell()

Returns the current position of the file pointer in an open file.

ftruncate()

Truncates an open file to a specified length.

fwrite()

Writes to an open file in a binary-safe manner.

glob()

Returns an array of filenames or directories that match a specified pattern.

is_dir()

Checks if a file is a directory.

is_executable()

Checks if a file is executable.

is_file()

Checks if a file is a regular file.

is_link()

Checks if a file is a symbolic link.

is_readable()

Checks if a file is readable.

is_uploaded_file()

Checks if a file was uploaded through an HTTP POST request.

is_writable()

Checks if a file is writable.

is_writeable()

A synonym for is_writable().

lchgrp()

Changes the user ownership of a symbolic link.

lchown()

Changes the user ownership of a symbolic link.

link()

Creates a hard link.

linkinfo()

Returns details about a hard link.

lstat()

Returns details about a file or symbolic link.

mkdir()

Creates a directory.

move_uploaded_file()

Moves an uploaded file to a new location.

parse_ini_file()

Parses a configuration file.

parse_ini_string()

Parses a configuration string.

pathinfo()

Returns details about a file path.

pclose()

Closes a pipe that was opened with popen().

popen()

Opens a pipe.

readfile()

Reads a file and outputs its contents to the buffer.

readlink()

Returns the target path of a symbolic link.

realpath()

Returns the absolute pathname.

realpath_cache_get()

Returns entries from the realpath cache.

realpath_cache_size()

Returns the size of the realpath cache.

rename()

Renames a file or directory.

rewind()

Resets a file pointer to the beginning of the file.

rmdir()

Deletes an empty directory.

set_file_buffer()

A synonym for stream_set_write_buffer(). Sets the buffer size for write operations on the given file.

stat()

Returns details about a file.

symlink()

Creates a symbolic link.

tempnam()

Creates a unique temporary file.

tmpfile()

Generates a unique temporary file.

touch()

Sets the access and modification times of a file.

umask()

Changes file permissions for files.

unlink()

Deletes a file.