Warning: include() [function.include]: Failed ...

If you see an error as "Warning: include() [function.include ]: Failed opening ... ", check include_path variable in php.ini.

You can get the path of php.ini from [System Setting] >> [Diagnostic Runtime Environment].

For example, if you see the following line,

include_path = "/usr/local/lib/php"

then, added '.:' before the existing path string.

include_path = ".:/usr/local/lib/php"