file_exists('/www/web/app/aaa/../../bbb.php') returns false.
The reported error is:
open_basedir restriction in effect.
But open_basedir params is OK and the file exists. Why?
PHP5.6.9 and CentOS6.5
open_basedir is a configuration directive to limit files that can be accessed by PHP to the specified directory-tree, including the file itself.
You will need to add the directory to your config via .htaccess or otherwise.
You can use php_admin_value open_basedir [directory]