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

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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.
> 

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