Генерация паролей в Codeigniter 3

passgen.php

<?php
function get_password_hash($password)
{
    $options = [
        'salt' => random_string('alnum', 30),
        'cost' => 10
    ];

    return password_hash($password, PASSWORD_BCRYPT, $options);
}

function password_hash($password, $algo, array $options = array())
	{
		static $func_overload;
		isset($func_overload) OR $func_overload = (extension_loaded('mbstring') && ini_get('mbstring.func_overload'));

		if ($algo !== 1)
		{
			trigger_error('password_hash(): Unknown hashing algorithm: '.(int) $algo, E_USER_WARNING);
			return NULL;
		}

		if (isset($options['cost']) && ($options['cost'] < 4 OR $options['cost'] > 31))
		{
			trigger_error('password_hash(): Invalid bcrypt cost parameter specified: '.(int) $options['cost'], E_USER_WARNING);
			return NULL;
		}

		if (isset($options['salt']) && ($saltlen = ($func_overload ? mb_strlen($options['salt'], '8bit') : strlen($options['salt']))) < 22)
		{
			trigger_error('password_hash(): Provided salt is too short: '.$saltlen.' expecting 22', E_USER_WARNING);
			return NULL;
		}
		elseif ( ! isset($options['salt']))
		{
			if (function_exists('random_bytes'))
			{
				try
				{
					$options['salt'] = random_bytes(16);
				}
				catch (Exception $e)
				{
					log_message('error', 'compat/password: Error while trying to use random_bytes(): '.$e->getMessage());
					return FALSE;
				}
			}
			elseif (defined('MCRYPT_DEV_URANDOM'))
			{
				$options['salt'] = mcrypt_create_iv(16, MCRYPT_DEV_URANDOM);
			}
			elseif (DIRECTORY_SEPARATOR === '/' && (is_readable($dev = '/dev/arandom') OR is_readable($dev = '/dev/urandom')))
			{
				if (($fp = fopen($dev, 'rb')) === FALSE)
				{
					log_message('error', 'compat/password: Unable to open '.$dev.' for reading.');
					return FALSE;
				}

				// Try not to waste entropy ...
				is_php('5.4') && stream_set_chunk_size($fp, 16);

				$options['salt'] = '';
				for ($read = 0; $read < 16; $read = ($func_overload) ? mb_strlen($options['salt'], '8bit') : strlen($options['salt']))
				{
					if (($read = fread($fp, 16 - $read)) === FALSE)
					{
						log_message('error', 'compat/password: Error while reading from '.$dev.'.');
						return FALSE;
					}
					$options['salt'] .= $read;
				}

				fclose($fp);
			}
			elseif (function_exists('openssl_random_pseudo_bytes'))
			{
				$is_secure = NULL;
				$options['salt'] = openssl_random_pseudo_bytes(16, $is_secure);
				if ($is_secure !== TRUE)
				{
					log_message('error', 'compat/password: openssl_random_pseudo_bytes() set the $cryto_strong flag to FALSE');
					return FALSE;
				}
			}
			else
			{
				log_message('error', 'compat/password: No CSPRNG available.');
				return FALSE;
			}

			$options['salt'] = str_replace('+', '.', rtrim(base64_encode($options['salt']), '='));
		}
		elseif ( ! preg_match('#^[a-zA-Z0-9./]+$#D', $options['salt']))
		{
			$options['salt'] = str_replace('+', '.', rtrim(base64_encode($options['salt']), '='));
		}

		isset($options['cost']) OR $options['cost'] = 10;

		return (strlen($password = crypt($password, sprintf('$2y$%02d$%s', $options['cost'], $options['salt']))) === 60)
			? $password
			: FALSE;
	}