Error reporting in PHP is a very usable option but sometimes you can be buried with “PHP Notice” lines which you don’t need (save space and bandwith).
PHP Notice: Undefined index: 11 in /home/website/blabla.php on line 52
To turn on reporting on all errors add this line above all other php lines (before error happens)
// Report all PHP errors error_reporting(E_ALL);
To turn on all errors except E_NOTICE
error_reporting(E_ALL ^ E_NOTICE);
To turn off reporting (not recommended)
To be sure that this will work, place error_reporting right below opening php tag (< ? php) More about this options can be found HERE.