They're notices, not warnings. They can be disabled via a simple call to the error_reporting function. I fundamentally disagree with you though. For me, notice

They're notices, not warnings. They can be disabled via a simple call to the error_reporting function. I fundamentally disagree with you though. For me, notices are very useful for identifying typos and other coding mistakes that can lead to incorrect behavior. Consider the following lines of code: $user_info = array( 'id' => 1, 'username' => 'nbpoole', 'is_guess' => false ); if (!$user_info['is_guest']) { echo 'Member stuff'; } When I run that script with error_reporting set to E_ALL, I get an "undefined index" notice pointing me to the line where I do the comparison: at that point, I can track down where in my code I misspelled the word guest. Without the notice, I might not immediately realize that the 'is_guest' index was mis-spelled somewhere.