I tried with a PPA - ppa:ondrej/php but it says
PLEASE DON'T USE PHP 5.4 OR PHP 5.5. The PHP 5.5 and later are no longer supported with security updates, therefore they are not included in this repository.
Note: I understand it is not preferred to use PHP5.5+ still i wanted to install. Is there is any ppa is available with php5.5.9 with all supported extensions?