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Here is my code:
sub test2{ return "HTML"; } sub test { return join '', test2("1", "$ENV{'HTTP_HOSTS'} "); } print test();
And here is the result:
C:\WINDOWS\system32\cmd.exe /c sh $ perl -w test.PL Use of uninitialized value in concatenation (.) or string at test.PL l +ine 11. HTML$
I am using perl, v5.8.3 built for MSWin32-x86-multi-thread. The second argument passed to test2 is undef, but why would that cause this error? Notice that test2 still returns "HTML". And how best to correct this error?

In reply to Why does an undef argument in a join produce this warning? by Anonymous Monk

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