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$a = 0b11000000101010000000101011111111;
$b = 0b11000000101010000000000100000000;
printf('%b',$a-$b);//100111111111
$a = '11000000101010000000101011111111';
$b = '11000000101010000000000100000000';
printf('%b', bindec($a)-bindec($b));//100111111111