public function lowerCaseRoman($s, $matchMode = 'strict') : string
	{
		$result = RomanNumerals::romanNumeralMatchCallback(
			$s,
			$matchMode,
			function (array $matches) {
				if (empty($matches[1])) {
					return $matches[1];
				}
				return strtolower($matches[1]);
			}
		);
		return $result;
	}
public function lowerCaseRoman($s, $matchMode = 'strict') : string
	{
		$result = RomanNumerals::romanNumeralMatchCallback(
			$s,
			$matchMode,
			function (array $matches) {
				if (empty($matches[1])) {
					return $matches[1];
				}
				return strtolower($matches[1]);
			}
		);
		return $result;
	}
public function lowerCaseRoman ( $ s , $ matchMode = 'strict' ) : string { $ result = RomanNumerals :: romanNumeralMatchCallback ( $ s , $ matchMode , function ( array $ matches ) { if ( empty ( $ matches [ 1 ] ) ) { return $ matches [ 1 ] ; } return strtolower ( $ matches [ 1 ] ) ; } ) ; return $ result ; }
Lowercases any Roman numerals found in the string.

@param $s
@param string $matchMode
@return string
Lowercases any Roman numerals found in the string .