You didn't specify and your example is ambiguous, but I'll assume you're talking about outputting in day-month-year format. You can use strtotime to parse a string date into a unix timestamp, and then give that timestamp to date along with the format that you'd like to output your date in:
date("d-m-Y", strtotime($date_from_mysql));
The manual page for date lists all the formatting options that you can give. In this case, d represents the day as a zero-padded number, m represents the month as a zero-padded number, and Y represents the year as a four digit number. Any characters that don't have a specific meaning for date come across as-is.