note 75317 deleted from language.types.boolean by danbrown

Note Submitter: Schraalhans Keukenmeester ---- Re: andy at txtnation dot com <quote> The braces are of course optional </quote> Nothing optional about the 'braces' here. '( )' are parentheses. '{ }' are braces. But we get the point. <?php $num = 10; $isEven = !($num % 2); echo ($isEven) ? 'Even' : 'Odd'; //outputs : Even $isEven = !$num % 2; echo ($isEven) ? 'Even' : 'Odd'; //outputs : Odd (with ANY number != 0 !!) ?> Operator precedence and implicit casts at work: $num = 10; !$num => (implicit cast to bool) $num: (bool) 10 = true !true => negate true : false false % 2 => (implicit cast to int) false : (int) false = 0 0 % 2 => remainder of 0 intdiv 2 : 0 $isEven = 0 => integer assignment : 0 ($isEven) ? => (implicit cast to bool) 0 : (bool) 0 = false echo (false) ? 'Even' : 'Odd' => condition false : 'Odd' Wether or not PHP actually performs the (bool) casts under the hood is irrelevant to the outcome here.