PHP's "root directory" on the server. Only used if non-empty for first-in-google

first-in-google
PHP's "root directory" on the server. Only used if non-empty. If PHP is configured with safe mode,
no files outside this directory are served.
engineboolean
This directive is really only useful in the Apache module version of PHP. It is used by sites that
would like to turn PHP parsing on and off on a per-directory or per-virtual server basis. By putting
php3_engine off in the appropriate places in the httpd.conf file, PHP can be enabled or
disabled.
error_logstring
http://greateventsupport.com/
Name of file where script errors should be logged. If the special value syslog is used, the errors
are sent to the system logger instead. On UNIX, this means syslog(3) and on Windows NT it means
the event log. The system logger is not supported on Windows 95.