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  • Okay, how about an E_NOTICE then? :) Commented Dec 7, 2010 at 21:10
  • @Stephen E_NOTICE might be ok, but to me the ambiguous state is concerning - how would you know by looking at one bit of code if the variable was in that state (having been cast somewhere else)? Also, I found another condition and added it to my answer. Commented Dec 8, 2010 at 7:06
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    As for Boolean evaluation, PHP docs clearly state what is considered to be false when evaluating to boolean and both empty string and a string "0" are considered false. So even when this feels bizare, it is normal and expected behaviour. Commented Jan 5, 2011 at 22:48
  • to add bit to confusion: echo "010" == 010 and echo "0x10" == 0x10 ;-) Commented Mar 25, 2013 at 15:00
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    Note that as of PHP 7, this answer's notes on scalar type hinting are inaccurate. Commented Jun 4, 2017 at 8:35