1. Download binaries on php.net (ZIP package based on your PC bit That package should php.exe file)
  2. Extract all files in a new folder :C:/wamp/bin/php/php(7.0.0)/
  3. Copy the wampserver.conf from another php folder (like php/php5.6.16/) to the new folder.
  4. Rename php.ini-development file to phpForApache.ini.