[Toolserver-announce] feof(): Use with care

[River Tarnell]

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Hi,

I've just found two PHP scripts that contain code like this:

  $x = fopen(...);
  while (!feof($x)) {
    ...
  }

This is unfortunate, because it creates an infinite loop when fopen
fails: since $x is not a file handle, feof() will never return true, and
the loop will never end.

This is particularly serious with PHP because the infinite loop creates
a log message every time, which fills the system disk, but it's
something to be avoided in any language.

Error handling is not just a nicety.  Doing it wrong creates serious
bugs.  Do it right.

	- river.
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