XOR Binary in PHP

问题

I want to XOR the binary but the result is still wrong xor xor example script:

function _xor($text,$key){
    for($i=0; $i<strlen($text); $i++){
            for($j=0; $j<strlen($key);$j++){
                $text[$i] = $text[$i]^$key[$j];
        }
    }
    return $text;
}

and this is the result :

10011110

should result xor between

01100001
01100010
--------
00000011

please give me the right answer

回答1:

function _xor($text,$key){
    for($i=0; $i<strlen($text); $i++){
        $text[$i] = intval($text[$i])^intval($key[$i]);
    }
    return $text;
}

echo  _xor('01100001','01100010');

Before you use ^, you should first convert string to int

There not need use two loops which are wrong, just one is ok.

来源：https://stackoverflow.com/questions/14365032/xor-binary-in-php