how to fix undefined index in PHP -

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this little question, why getting error message?

severity: notice  message: undefined index: filter  filename: libraries/functions.php(656) : eval()'d code  line number: 43

it says problem lays here: 

$filter2 = $_get['filter'];

i have defined filter2, want use filter2 compare if contains word 'realscan'

the problem fixed if use isset(), convert integer, cant use that.

if($filter2 == 'realscan') { //something here   }

you need check see if defined before use it:

$filter2 = isset($_get['filter']) ? $_get['filter'] : '';

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