Stop Error Reporting Notice: Undefined LInux Apache PHP Server

ok, sometimes when you don want some errors or warning, you can disable this for good in your server.

all you have to do is follow these steps:

login as root

send command:

now look for this line:

Change it to:

restart apache server with this command:

here is some good information you should read about disabling this in your php configuration file:

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
Error handling and logging ;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

error_reporting is a bit-field.  Or each number up to get desired error
reporting level
E_ALL             - All errors and warnings (doesn't include E_STRICT)
E_ERROR           - fatal run-time errors
E_WARNING         - run-time warnings (non-fatal errors)
E_PARSE           - compile-time parse errors
E_NOTICE          - run-time notices (these are warnings which often result
                    from a bug in your code, but it's possible that it was
                    intentional (e.g., using an uninitialized variable and
                    relying on the fact it's automatically initialized to an
                    empty string)
E_STRICT          - run-time notices, enable to have PHP suggest changes
                    to your code which will ensure the best interoperability
                    and forward compatibility of your code
E_CORE_ERROR      - fatal errors that occur during PHP's initial startup
E_CORE_WARNING    - warnings (non-fatal errors) that occur during PHP's
                    initial startup
E_COMPILE_ERROR   - fatal compile-time errors
E_COMPILE_WARNING - compile-time warnings (non-fatal errors)
E_USER_ERROR      - user-generated error message
E_USER_WARNING    - user-generated warning message
E_USER_NOTICE     - user-generated notice message
;
Examples:
;
  - Show all errors, except for notices and coding standards warnings
;
;error_reporting = E_ALL & ~E_NOTICE
;
  - Show all errors, except for notices
;
;error_reporting = E_ALL & ~E_NOTICE | E_STRICT
;
  - Show only errors
;
;error_reporting = E_COMPILE_ERROR|E_ERROR|E_CORE_ERROR
;
  - Show all errors, except coding standards warnings
;
;
error_reporting  =  E_ALL

Print out errors (as a part of the output).  For production web sites,
you're strongly encouraged to turn this feature off, and use error logging
instead (see below).  Keeping display_errors enabled on a production web site
may reveal security information to end users, such as file paths on your Web
server, your database schema or other information.