PHP include path (Linux)

Question

Say a php file has include_once("$CONF/blah.inc") in it. Where is this $CONF and the default location?

Answer 1

$CONF looks like a normal PHP variable to me. Try poking around the the files you include earlier.

Answer 2

Search it..

grep -R CONF *

Answer 3

$CONF is a configuration variable set in an already sourced file. The search path is relative to at least one element from the include_path variable.

See http://www.php.net/manual/en/ini.core.php#ini.include-path for more details.