* replaces a copy of string delimited by the start and (optionally) length parameters with the string given in replacement.
*
* @param string $string
* @param string $replacement The replacement string.
* @param int $start If start is positive, the replacing will begin at the start'th offset into string. If start is negative, the replacing will begin at the start'th character from the end of string.
* @param int $length Length of the part to be replaced
* @param string $encoding The encoding parameter is the character encoding. Defaults to UTF-8
* @return string
* @deprecated 8.2.0 Use substr_replace() instead.
*/
public static function mb_substr_replace($string, $replacement, $start, $length = 0, $encoding = 'UTF-8') {