The Big "Why equal doesn't equal" Quiz

The Big "Why equal doesn't equal" Quiz

Presented on May 17th 2014 at PHP Day, Verona, Italy.
http://2014.phpday.it/
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Partial slide deck - the actual quiz will not be made public.
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We all compare data on nearly every other line in our code, be it input validation, an if-statement, a switch or determining what to display and how.
So of course we are all experts on how to do these comparisons…. Or are we?
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Links:
http://phpcheatsheets.com/
https://github.com/jrfnl/PHP-cheat-sheet-extended