The standalone PHP interpreter does not honour the -c commandline option:

ls -l /JobsAdverts/Config/php.ini 
-rw-r--r--   1 schwenke users         206 Sep 26  2000 /JobsAdverts/Config/php.ini

$strace -e open ./php -c /JobsAdverts/Config -f test
...
open("./php.ini", O_RDONLY)             = -1 ENOENT (No such file or directory)
open("/etc/php.ini", O_RDONLY)          = -1 ENOENT (No such file or directory)
... (no more tries to open php.ini)

./php -v
4.0.6