46 $first = mb_substr( $str, 0, 1 );
47 if ( in_array( $first, self::LC ) ) {
48 $first = str_replace( self::LC, self::UC, $first );
49 return $first . mb_substr( $str, 1 );
51 return parent::ucfirst( $str );
55 $first = mb_substr( $str, 0, 1 );
56 if ( in_array( $first, self::UC ) ) {
57 $first = str_replace( self::UC, self::LC, $first );
58 return $first . mb_substr( $str, 1 );
60 return parent::lcfirst( $str );