[ci skip] 3.1.10 release

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-#######################
-Compatibility Functions
-#######################
-
-CodeIgniter provides a set of compatibility functions that enable
-you to use functions what are otherwise natively available in PHP,
-but only in higher versions or depending on a certain extension.
-
-Being custom implementations, these functions will also have some
-set of dependencies on their own, but are still useful if your
-PHP setup doesn't offer them natively.
-
-.. note:: Much like the :doc:`common functions <common_functions>`, the
-	compatibility functions are always available, as long as
-	their dependencies are met.
-
-.. contents::
-  :local:
-
-.. raw:: html
-
-  <div class="custom-index container"></div>
-
-****************
-Password Hashing
-****************
-
-This set of compatibility functions offers a "backport" of PHP's
-standard `Password Hashing extension <http://php.net/password>`_
-that is otherwise available only since PHP 5.5.
-
-Dependencies
-============
-
-- PHP 5.3.7
-- ``CRYPT_BLOWFISH`` support for ``crypt()``
-
-Constants
-=========
-
-- ``PASSWORD_BCRYPT``
-- ``PASSWORD_DEFAULT``
-
-Function reference
-==================
-
-.. php:function:: password_get_info($hash)
-
-	:param	string	$hash: Password hash
-	:returns:	Information about the hashed password
-	:rtype:	array
-
-	For more information, please refer to the `PHP manual for
-	password_get_info() <http://php.net/password_get_info>`_.
-
-.. php:function:: password_hash($password, $algo[, $options = array()])
-
-	:param	string	$password: Plain-text password
-	:param	int	$algo: Hashing algorithm
-	:param	array	$options: Hashing options
-	:returns:	Hashed password or FALSE on failure
-	:rtype:	string
-
-	For more information, please refer to the `PHP manual for
-	password_hash() <http://php.net/password_hash>`_.
-
-	.. note:: Unless you provide your own (and valid) salt, this function
-		has a further dependency on an available CSPRNG source. Each
-		of the following would satisfy that:
-		- ``mcrypt_create_iv()`` with ``MCRYPT_DEV_URANDOM``
-		- ``openssl_random_pseudo_bytes()``
-		- /dev/arandom
-		- /dev/urandom
-
-.. php:function:: password_needs_rehash()
-
-	:param	string	$hash: Password hash
-	:param	int	$algo: Hashing algorithm
-	:param	array	$options: Hashing options
-	:returns:	TRUE if the hash should be rehashed to match the given algorithm and options, FALSE otherwise
-	:rtype:	bool
-
-	For more information, please refer to the `PHP manual for
-	password_needs_rehash() <http://php.net/password_needs_rehash>`_.
-
-.. php:function:: password_verify($password, $hash)
-
-	:param	string	$password: Plain-text password
-	:param	string	$hash: Password hash
-	:returns:	TRUE if the password matches the hash, FALSE if not
-	:rtype:	bool
-
-	For more information, please refer to the `PHP manual for
-	password_verify() <http://php.net/password_verify>`_.
-
-*********************
-Hash (Message Digest)
-*********************
-
-This compatibility layer contains backports for the ``hash_equals()``
-and ``hash_pbkdf2()`` functions, which otherwise require PHP 5.6 and/or
-PHP 5.5 respectively.
-
-Dependencies
-============
-
-- None
-
-Function reference
-==================
-
-.. php:function:: hash_equals($known_string, $user_string)
-
-	:param	string	$known_string: Known string
-	:param	string	$user_string: User-supplied string
-	:returns:	TRUE if the strings match, FALSE otherwise
-	:rtype:	string
-
-	For more information, please refer to the `PHP manual for
-	hash_equals() <http://php.net/hash_equals>`_.
-
-.. php:function:: hash_pbkdf2($algo, $password, $salt, $iterations[, $length = 0[, $raw_output = FALSE]])
-
-	:param	string	$algo: Hashing algorithm
-	:param	string	$password: Password
-	:param	string	$salt: Hash salt
-	:param	int	$iterations: Number of iterations to perform during derivation
-	:param	int	$length: Output string length
-	:param	bool	$raw_output: Whether to return raw binary data
-	:returns:	Password-derived key or FALSE on failure
-	:rtype:	string
-
-	For more information, please refer to the `PHP manual for
-	hash_pbkdf2() <http://php.net/hash_pbkdf2>`_.
-
-****************
-Multibyte String
-****************
-
-This set of compatibility functions offers limited support for PHP's
-`Multibyte String extension <http://php.net/mbstring>`_. Because of
-the limited alternative solutions, only a few functions are available.
-
-.. note:: When a character set parameter is ommited,
-	``$config['charset']`` will be used.
-
-Dependencies
-============
-
-- `iconv <http://php.net/iconv>`_ extension
-
-.. important:: This dependency is optional and these functions will
-	always be declared. If iconv is not available, they WILL
-	fall-back to their non-mbstring versions.
-
-.. important:: Where a character set is supplied, it must be
-	supported by iconv and in a format that it recognizes.
-
-.. note:: For you own dependency check on the actual mbstring
-	extension, use the ``MB_ENABLED`` constant.
-
-Function reference
-==================
-
-.. php:function:: mb_strlen($str[, $encoding = NULL])
-
-	:param	string	$str: Input string
-	:param	string	$encoding: Character set
-	:returns:	Number of characters in the input string or FALSE on failure
-	:rtype:	string
-
-	For more information, please refer to the `PHP manual for
-	mb_strlen() <http://php.net/mb_strlen>`_.
-
-.. php:function:: mb_strpos($haystack, $needle[, $offset = 0[, $encoding = NULL]])
-
-	:param	string	$haystack: String to search in
-	:param	string	$needle: Part of string to search for
-	:param	int	$offset: Search offset
-	:param	string	$encoding: Character set
-	:returns:	Numeric character position of where $needle was found or FALSE if not found
-	:rtype:	mixed
-
-	For more information, please refer to the `PHP manual for
-	mb_strpos() <http://php.net/mb_strpos>`_.
-
-.. php:function:: mb_substr($str, $start[, $length = NULL[, $encoding = NULL]])
-
-	:param	string	$str: Input string
-	:param	int	$start: Position of first character
-	:param	int	$length: Maximum number of characters
-	:param	string	$encoding: Character set
-	:returns:	Portion of $str specified by $start and $length or FALSE on failure
-	:rtype:	string
-
-	For more information, please refer to the `PHP manual for
-	mb_substr() <http://php.net/mb_substr>`_.
-
-******************
-Standard Functions
-******************
-
-This set of compatibility functions offers support for a few
-standard functions in PHP that otherwise require a newer PHP version.
-
-Dependencies
-============
-
-- None
-
-Function reference
-==================
-
-.. php:function:: array_column(array $array, $column_key[, $index_key = NULL])
-
-	:param	array	$array: Array to fetch results from
-	:param	mixed	$column_key: Key of the column to return values from
-	:param	mixed	$index_key: Key to use for the returned values
-	:returns:	An array of values representing a single column from the input array
-	:rtype:	array
-
-	For more information, please refer to the `PHP manual for
-	array_column() <http://php.net/array_column>`_.
-
-.. php:function:: hex2bin($data)
-
-	:param	array	$data: Hexadecimal representation of data
-	:returns:	Binary representation of the given data
-	:rtype:	string
-
-	For more information, please refer to the `PHP manual for hex2bin()
-	<http://php.net/hex2bin>`_.