How to overcome, 'PHP Notice: Use of undefined constant' -

my friend, able run without no errors:

$a = $_get[a]; 

however, unable run get[] because gives me error message:

use of undefined constant - assumed 'a'

is there way can change in php settings can run code friend can run code?

many thanks!

i understand have write way:

$a = $_get['a']; 

you can turn off notices, ignoring check engine light on car...

// report errors except e_notice // default value set in php.ini error_reporting(e_all ^ e_notice); 

you should checking whether it's set...

$a = !empty($_get['a']) ? $_get['a'] : null;