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my($foo);

...
  $foo = getValue();
  codeThatUsesFoo($foo);
}

for ($i = 0; $i < $a_huge_value; $i++) {
   my $foo = getValue();
   codeThatUsesFoo($foo);
}

my($key);
my($value);
...
for ($i = 0; $i < $a_whole_lot; $i++) {
  my($key, $value) = returnsAnArray();
}