Missing sections, and undefined indices
It seems some of the variables are not defined properly. It is recommended to define variables properly to avoid some security vulnerabilities or bugs. Although PHP doesn't create any execution error.

To Solve this, you may choose any of below choices.

1.) Properly declare variables - Recommended 

$value = isset($_POST['value']) ? $_POST['value'] : '';


2.) Set custom error handler function

set_error_handler('myHandlerForMinorErrors', E_NOTICE | E_STRICT)

http://php.net/manual/en/function.set-error-handler.php


3.) Disable E_NOTICE from reporting - Fix

error_reporting( error_reporting() &amp; ~E_NOTICE ).