Error reporting at runtime

I have error reporting turned off in my php.ini file on my production server. I have an app I'm writing that I need to run on the same server (no one can see it though). Anyway. I want to turn on error reporting during runtime for this particular app while I'm debugging it. so I put error_reporting (E_ERROR | E_WARNING | E_PARSE | E_NOTICE); in the script, but I don;t see any warnings. I also tried error_reporting(2047); or error_reporting(8); still nothing. To sest it, I tried to echo some random variable that doesn't exist in the very next line, but no warning about it. So what gives? What am I doing wrong? Basicaly I want the same effect as if I had error_reporting = E_ALL set in php.ini. - Anthony