Well in my php.ini file there is a line that will turn off ALL warnings... if this is more of what you want.... other than that I dont know: there is a line in there that probably reads
error_reporting = E_ALL & ~E_NOTICE
change this line to read something like:
error_reporting = E_COMPILE_ERROR|E_ERROR|E_CORE_ERROR
Like I said this will turn off ALL warnings... and only spit out errors, fatal errors, stuff like that.
Hope thats better.