lucy24 - 10:40 pm on Sep 18, 2013 (gmt 0)
Aren't they analogous to wmt "errors"? Look at what it says and decide whether you need to do something about it.
For example: you've got code that says "if such-and-such exists, do A; otherwise do B". The php error log file on my MAMP installation racks up a Warning every time such-and-such is found not to exist. Well, yeah. The only way to find out if it exists is to look for it. It doesn't necessarily mean you did something wrong. "I'm just sayin'..."