<?php

	$res = subtract(1123,434);
	
	echo $res;
	
	
	
	
function subtract($a, $b)
{

    while ($b != 0 && $count < 32)
    {    
        $n = ((~ $a) & $b) * 2;
    
        $d = (($a & (~ $b)) | (~$a & ($b)));

        $a = $d;
        $b = $n;
        
        $count = $count + 1;
    }
    
    return ( $d );
}
