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

Mathijs <m.v.veluw@xxxxxxxxxx> · Tue, 04 Jul 2006 16:12:54 +0200

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 :).

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