If there is a conditional on a non-existant (not-set)
variable, it returns an automatic true, instead of an
automatic false.

Examples: (assume that $myVar has never been set)

1. if ($myVar) echo "hello!";  <-- this does echo 'hello'
2. if ($myVar == "42") echo "babel";  <-- this echoes 'babel'
3.
  switch ($myVar) {
    case "42":
      echo "babel";

    default:
      echo "fish";
  } 

  the above example echoes "babel" (!!).

I am aware that I should actually check for isset ($myVar),
but these examples are all from legacy code that I looked at
and that have suddenly started to produce the opposite
result as desired.  What I have described is still a bug,
since a non existant variable should never return true when
compared to a scalar.

Thanks for your help,
Ronen.

PS:
This seems to have appeared with PHP4.04pl1.
Also, I can send you our php.ini file, if needed.