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How to find your php.ini file

Finding your php.ini is pretty straight forward task: 

1. open terminal or cmd 
2. execute php --ini if php is undefined you should add it to your PATH or just execute "/your/path/to/php --ini"
3. php.ini has several modes (path is different sometimes...):
1. using one file: 

   Configuration File (php.ini) Path: /etc/php5/cli
   Loaded Configuration File: /etc/php5/cli/php.ini

2. using several different files (will help to maintain common settings between cli php.ini and httpd php.ini

   Scan for additional .ini files in: /etc/php5/conf.d
   Additional .ini files parsed: /etc/php5/conf.d/ctype.ini,
   /etc/php5/conf.d/curl.ini, 
   /etc/php5/conf.d/dom.ini,
   /etc/php5/conf.d/gd.ini,
   /etc/php5/conf.d/hash.ini,
   ............more .ini files here............  

   files content could be "extension=gd.so" (unix) or "extension=gd.dll" (windows)

4. there are two more options to get your ini files: 
1. execute in cli mode: "php --i | grep .ini"
2. write your own script and check via browser:
   <?php phpinfo(); ?>  

That's it, now you can just edit your php.ini with anything you think you will need for future PHP programming. 
More about php.ini may be found at http://php.net/manual/en/ini.php