A lot of [warnings] can be ignored

In general, warnings should NOT be ignored. There are certain exceptions (e.g., in a CGI script it is common to interpolate an input into link URLs without checking whether it is defined, so that if the user once specifies it it is subsequently preserved), but even there you should only ignore these warnings if you are certain you understand fully what is causing them, and even then it's good practice to clean them up, to make life easier when maintaining your code later (since noisy output can obscure real issues).

If you get into the habbit of ignoring warnings, you're going to end up with a big mess down the road.

In reply to Re^2: Hash code bug by jonadab
in thread Hash code bug by Secode

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