Someone correct me if I am wrong, the numbers in quotes are being read as strings and not numbers, or numbers not strings. The == works with numbers, and the quotes are for strings. I think that the way you have it set up, the number one is returning true when the $variable is defined.
Numbers in quotes are strings but in the numerical context (which is provided by the numerical equality operator "==" here) they are converted to numbers on the fly (non-number strings being 0), so that's not the issue here. Besides, if you run this sample code, you'll see that it works just fine.
-zsdc.
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