quick note: php v7 phar and openssl modules are now in core

If you see warnings such as below, for openssl.so or phar.so:

PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/lib/php/modules/openssl.so' - /usr/lib/php/modules/openssl.so: cannot open shared object file: No such fi
le or directory in Unknown on line 0
PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/lib/php/modules/phar.so' - /usr/lib/php/modules/phar.so: cannot open shared object file: No such file or
directory in Unknown on line 0

Then comment out the entries in your php.ini

source: http://unix.stackexchange.com/questions/256338/how-to-install-php7-modules-in-archlinux/256482

ps: Similar issue with mysql.so, deprecated for mysqli.so. source: https://www.digitalocean.com/company/blog/getting-ready-for-php-7/