can't find extension_dir in php.ini
<p>I am trying to locate where extension_dir is being set.  I've looked in the loaded configuration file (cli and web) but it's not in there.  However, phpinfo and php -i both show a value that is set.  </p>

<p>Is there a fallback default value for when the dir is not explicitly set in php.ini? </p>

<p>Thanks</p>
