What is an Undefined Index PHP Error? How to Fix It?

1. Adding Code at the Top of the Page

A simple way to ask PHP to disable reporting of notices is to put a line of code at the beginning of the PHP page.

Code:

<?php error_reporting (E_ALL ^ E_NOTICE); ?> 

Or you can add the following code which stops all the error reporting,

<?php error_reporting(0); ?> 

2. Changes in php.ini 

Php.ini is a configuration file and is essential for all the programs running on PHP. Open this file and find the field error_reporting. The easiest way is to use the ctrl + F shortcut key. By default, error reporting is set to E_ALL. That means all errors are reported. Change this to E_ALL & ~E_NOTICE. It means all errors except for the notices will now be reported.