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Octopussy numbers in PHP

Someone reported a bug in ADOdb, the open source db library i maintain. I went crazy for half an hour until i realised the problem. Here's a little gotcha you can try:

echo 09," => (09) <br>";
echo 9," => (9) <br>";

If you expect the above code to produce the same values, you are sadly mistaken. Try it. Also see the followup.