I have a development version of PHP on Apache. I moved it to production and got this weird notices in my website. I don\'t have it on development version. How to enable thes
If you have access to your php.ini, then Björn answer is the way to go.
However, if you don't, or if you want to change a particular script / project error level, do this at the beginning of your code:
ini_set('display_errors', 1);
// Enable error reporting for NOTICES
error_reporting(E_NOTICE);
You can see which levels are available for error_reporting here: http://us2.php.net/manual/en/function.error-reporting.php.
It's always a good practice not to show any errors on production environments, but logging any weird behaviors and sending by mail to the administrator. NOTICES should only be enabled on development environments.