PHP

PHP.ini

php.ini is the configuration file for PHP.

Q: Where is php.ini?

A: Beats me, the @#%&*$ thing could be anywhere. On top of that, each site/folder can have a php.ini that overrides the global settings for that site/folder.

Easy Apache 3 PHP.ini location:
/usr/local/lib/php.ini

Easy Apache 4 php.ini location:

¯\_(ツ)_/¯ 

Version

See: Software Versions to check the installed version.