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/**
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/**
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 * Common String Functions
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 * Common String Functions
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 *
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 *
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 * PHP version 5
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 * PHP version 5
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 *
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 *
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 * @category  Common
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 * @package   Functions\Strings
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 * @author    Jim Wigginton <terrafrost@php.net>
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 * @author    Jim Wigginton <terrafrost@php.net>
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 * @copyright 2016 Jim Wigginton
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 * @copyright 2016 Jim Wigginton
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 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
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 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
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 * @link      http://phpseclib.sourceforge.net
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 * @link      http://phpseclib.sourceforge.net
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 */
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 */
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use phpseclib3\Math\Common\FiniteField;
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use phpseclib3\Math\Common\FiniteField;
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/**
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/**
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 * Common String Functions
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 * Common String Functions
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 *
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 *
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 * @package Functions\Strings
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 * @author  Jim Wigginton <terrafrost@php.net>
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 * @author  Jim Wigginton <terrafrost@php.net>
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 */
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 */
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abstract class Strings
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abstract class Strings
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{
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{
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    /**
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    /**
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     *
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     *
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     * Inspired by array_shift
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     * Inspired by array_shift
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     *
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     *
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     * @param string $string
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     * @param string $string
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     * @param int $index
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     * @param int $index
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     * @access public
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     * @return string
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     * @return string
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     */
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     */
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    public static function shift(&$string, $index = 1)
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    public static function shift(&$string, $index = 1)
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    {
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    {
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        $substr = substr($string, 0, $index);
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        $substr = substr($string, 0, $index);
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     *
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     *
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     * Inspired by array_pop
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     * Inspired by array_pop
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     *
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     *
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     * @param string $string
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     * @param string $string
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     * @param int $index
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     * @param int $index
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     * @access public
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     * @return string
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     * @return string
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     */
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     */
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    public static function pop(&$string, $index = 1)
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    public static function pop(&$string, $index = 1)
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    {
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    {
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        $substr = substr($string, -$index);
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        $substr = substr($string, -$index);
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    /**
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    /**
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     * Create SSH2-style string
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     * Create SSH2-style string
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     *
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     *
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     * @param string $format
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     * @param string $format
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     * @param string|int|float|array|bool ...$elements
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     * @param string|int|float|array|bool ...$elements
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     * @access public
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     * @return string
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     * @return string
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     */
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     */
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    public static function packSSH2($format, ...$elements)
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    public static function packSSH2($format, ...$elements)
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    {
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    {
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        $format = self::formatPack($format);
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        $format = self::formatPack($format);
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    /**
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    /**
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     * Expand a pack string
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     * Expand a pack string
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     *
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     *
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     * Converts C5 to CCCCC, for example.
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     * Converts C5 to CCCCC, for example.
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     *
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     *
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     * @access private
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     * @param string $format
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     * @param string $format
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     * @return string
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     * @return string
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     */
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     */
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    private static function formatPack($format)
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    private static function formatPack($format)
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    {
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    {
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     * bin2hex / hex2bin refer to base-256 encoded data as binary, whilst
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     * bin2hex / hex2bin refer to base-256 encoded data as binary, whilst
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     * decbin / bindec refer to base-2 encoded data as binary. For the purposes
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     * decbin / bindec refer to base-2 encoded data as binary. For the purposes
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     * of this function, bin refers to base-256 encoded data whilst bits refers
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     * of this function, bin refers to base-256 encoded data whilst bits refers
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     * to base-2 encoded data
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     * to base-2 encoded data
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     *
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     *
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     * @access public
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     * @param string $x
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     * @param string $x
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     * @return string
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     * @return string
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     */
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     */
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    public static function bits2bin($x)
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    public static function bits2bin($x)
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    {
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    {
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    }
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    }
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    /**
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    /**
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     * Convert bits to binary data
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     * Convert bits to binary data
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     *
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     *
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     * @access public
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     * @param string $x
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     * @param string $x
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     * @return string
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     * @return string
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     */
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     */
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    public static function bin2bits($x, $trim = true)
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    public static function bin2bits($x, $trim = true)
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    {
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    {
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    }
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    }
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    /**
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    /**
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     * Switch Endianness Bit Order
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     * Switch Endianness Bit Order
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     *
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     *
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     * @access public
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     * @param string $x
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     * @param string $x
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     * @return string
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     * @return string
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     */
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     */
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    public static function switchEndianness($x)
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    public static function switchEndianness($x)
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    {
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    {
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    /**
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    /**
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     * Increment the current string
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     * Increment the current string
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     *
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     *
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     * @param string $var
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     * @param string $var
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     * @return string
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     * @return string
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     * @access public
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     */
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     */
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    public static function increment_str(&$var)
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    public static function increment_str(&$var)
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    {
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    {
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        if (function_exists('sodium_increment')) {
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        if (function_exists('sodium_increment')) {
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            $var = strrev($var);
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            $var = strrev($var);