Re: Bitwise operators and check if an bit is NOT within theflag.

Jochem Maas wrote:

Mathijs wrote:

Hello there. I am working with some bitwise Operators for validating some variables. Now i need to know if an certain bit is NOT set and an other bit IS set. Example. <?php const VALIDATE_CHECK1 = 1; const VALIDATE_CHECK2 = 2; const VALIDATE_CHECK3 = 4;

const VALIDATE_ALL    = 7;

//--Example 1 - This works nice. $flag1 = self::VALIDATE_CHECK1; //Do if VALIDATE_CHECK1 is set if ($flag1 & self::VALIDATE_CHECK1) {

    print 'Validate 1';

} //Do if VALIDATE_CHECK2 is set if ($flag1 & self::VALIDATE_CHECK2) {

    print 'Validate 2';

} //--Example 2 - I want to check if VALIDATE_CHECK3 is not set and then continue. $flag2 = self::VALIDATE_ALL; //Do if VALIDATE_CHECK1 is set BUT NOT when VALIDATE_CHECK3 is set. if ($flag2 & self::VALIDATE_CHECK1 && $flag2 & ~self::VALIDATE_CHECK3) {

class Test { const VALIDATE_CHECK1 = 1; const VALIDATE_CHECK2 = 2; const VALIDATE_CHECK3 = 4;

const VALIDATE_ALL    = 7;

static function check($flag2) { if (($flag2 & self::VALIDATE_CHECK1) &&

    	    !($flag2 & self::VALIDATE_CHECK3)) print "Only Validate 1";

} } echo "First attempt: "; Test::check( Test::VALIDATE_ALL ); echo "\nSecond attempt: "; Test::check( Test::VALIDATE_CHECK1 ); echo "\n";

    print 'Only Validate 1';

} //etc... ?> This last example i can't seem to get to work. I Want to only do that when for example VALIDATE_CHECK3 is not within the $flag2. How can i do this? Thx in advanced.

Thank you very much. This seems to work :).