Strange 'if' test bug?

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Sorry if this is a newbie FAQ,

<?php
$key=0;
if($key == "muppet") {
  echo "key is a muppet: $key";
} else {
  echo "key is something else: $key";
}
?>

Will print completely the wrong line:

====> key is a muppet: 0

If I use three equals signs, i.e. ===, then the test works.

But if I use linux, the test works as expected with two equals signs.

What on earth am I missing?

Using Windows PHP 4.3.8 as a CGI, on Apache 1.3.31.

Many thanks in advance for any help,
Steve

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