In Seven Uses of local, the unnamed writer at TPJ says that 
  foreach (@array) {
    ... 
    $f = getfile($filename);
    ...
  }

[download]
will blow away the values in @array because of the way foreach aliases $_ with the elements, and that function happens to (implicitly) use $_.

So if that's such a problem, why don't we run into it more often? Should we write all our functions to localize $_ just in case someone wants to call it within a foreach loop? Or should the coder of a foreach name his variable or localize it himself if his body is nontrivial?

—John

In reply to Should we Localize $_ ? by John M. Dlugosz

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