string.php

	/**
	 * Catch an error and throw an exception.
	 *
	 * @param   integer  $number   Error level
	 * @param   string   $message  Error message
	 *
	 * @return  void
	 *
	 * @link    https://bugs.php.net/bug.php?id=48147
	 *
	 * @throw   ErrorException
	 */
	private static function _iconvErrorHandler($number, $message)
	{
		throw new ErrorException($message, 0, $number);
	}

	/**
	 * Transcode a string.
	 *
	 * @param   string  $source         The string to transcode.
	 * @param   string  $from_encoding  The source encoding.
	 * @param   string  $to_encoding    The target encoding.
	 *
	 * @return  mixed  The transcoded string, or null if the source was not a string.
	 *
	 * @link    https://bugs.php.net/bug.php?id=48147
	 *
	 * @since   11.1
	 */
	public static function transcode($source, $from_encoding, $to_encoding)
	{
		if (is_string($source))
		{
			set_error_handler(array(__CLASS__, '_iconvErrorHandler'), E_NOTICE);
			try
			{
				/*
				 * "//TRANSLIT//IGNORE" is appended to the $to_encoding to ensure that when iconv comes
				 * across a character that cannot be represented in the target charset, it can
				 * be approximated through one or several similarly looking characters or ignored.
				 */
				$iconv = iconv($from_encoding, $to_encoding . '//TRANSLIT//IGNORE', $source);
			}
			catch (ErrorException $e)
			{
				/*
				 * "//IGNORE" is appended to the $to_encoding to ensure that when iconv comes
				 * across a character that cannot be represented in the target charset, it is ignored.
				 */
				$iconv = iconv($from_encoding, $to_encoding . '//IGNORE', $source);
			}
			restore_error_handler();
			return $iconv;
		}

		return null;
	}