require_once() Error in linux (apache2)

Question

Hi, While i try to deploy the code devloped on wamp server on the dev machine on linux , i get this error: Warning: require_once(/PHP file) [function.require-once]: failed to open stream: No such file or directory in /var/www/proj/index.php on line 38

Fatal error: require_once() [function.require]: Failed opening required '/PHP file' (include_path='.:/var/www/proj:/var/www/proj/framework:') in /var/www/proj/index.php on line 38

Now the PHP file i called is in the path "/var/www/proj/framework"

Answer 1

You have just supplied wrong filename.
Use proper path to this PHP file

Answer 2

require_once("/PHP file")

is using an absolute path and looking for PHP file in the server's filesystem root directory

require_once("./PHP file")

or

require_once("PHP file")

is a relative path that would search for PHP file using the include path