Fair enough. I suggest you check out the PHP Manual section on Error Handling, paying special attention to the error_reporting function, as well as other pertinent information in those manual sections (check the links on the right side of the pages, if you are not familiar with the "online" PHP Manual's layout).
Using the error_reporting function (second link above), you can "tweak" your code (see the provided examples), for a program without modifying the php.ini in use. In order to avoid having to set this value in each script, you could include it as a part of any common code that is routinely called into your scripts with "include").
Remember, should you choose to do this, that you may remain blissfully unaware of a "borked" condition, and will most likely have to set error_reporting back on to even know what has happened if your script "breaks".
I'm just wondering if there is a particular reason why you would choose to do this as opposed to tracking down and fixing the errors.