title: Where can I find php.ini?
body: <p>A few years ago I installed Apache 2.2x and PHP 5.3.1 on a Linux server I maintain.  I used .tar.gz's and built them as instructed (instead of rpms and what-have-you). And all was fine.</p>
  <p>Today I need to install <a href="http://us2.php.net/ibm_db2" rel="noreferrer">this</a> which seems like a PHP library.  I went through all the steps up to make install, and I found ibm_db2.so in <code>$PHP_HOME/lib/extensions/somecomplicatedname/ibm_db2.so</code>.</p>
  <p>The great catch is the last step is to configure file <em>php.ini</em>, but there aren't <em><strong>any</strong></em> <em>php.ini</em> files on my system. Horror of horrors. PHP works fine, except of course for this newfangled ibm_db2 thingamajig that I want to use so somebody can use a GUI to tinker with <a href="https://en.wikipedia.org/wiki/IBM_DB2" rel="noreferrer">DB2</a>. (I tried a small PHP script which fails and indicates that the ibm_db2 functions are not available.)</p>
  <p>I have to deal with PHP once every few years, so please enlighten me at a very basic level about what I could do to enable web-based GUI access to DB2.</p>