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Just a fyi, with:

print $array[foo];

PHP looks for a constant named foo first, if it does not exist then it'll shout an error of level E_NOTICE and then look for the key foo (which is what you wanted) ...

error_reporting can be set about anywhere, including php.ini, .htaccess and the error_reporting() function.  And some code:

define('a', 'b'); 
$arr = array('a' => 'apple', 'b' => 'banana');
print $arr[a];   // banana
print $arr['a']; // apple

Moral of the story is you should always surround your array keys with quotes! ;)