set_include_path() problems

Problems with include, require file.

.:/usr/lib/php:/usr/local/lib/php:/home/mypage/php

Error message:

Warning: require_once(source/file.php) [function.require-once]: failed to open stream: 
No such file or directory in /home/mypage/public_html/log/test/include.php on line 2

Fatal error: require_once() [function.require]:
Failed opening required source/file.php(include_path=.:/usr/lib/php:/usr/local/lib/php:/home/mypage/php)
in /home/mypage/public_html/log/test/include.php on line 2

Solution:

get_include_path();
set_include_path(.:/usr/lib/php:/usr/local/lib/php:/home/mypage/php);
get_include_path();

require_once source/file.php;