function xorBytes(array $a, array $b): array {
$result = [];
for ($i = 0; $i < count($a); $i++) {
$result[$i] = $a[$i] ^ $b[$i];
}
return $result;
}
function printBitsetArray(string $label, array $array): void {
echo $label . ": ";
foreach ($array as $byte) {
echo str_pad(decbin($byte), 8, '0', STR_PAD_LEFT) . " ";
}
echo PHP_EOL;
}
// str_split("Albus") = takes the string "Albus" and turns it into an array of characters.
// array_map('ord', ...) = applies the ord() function to each character.
// ord() gives the ASCII value of a character.
$a = array_map('ord', str_split("Aeryn"));
$b = array_map('ord', str_split("Albus"));
$c = xorBytes($a, $b);
printBitsetArray("a", $a);
printBitsetArray("b", $b);
printBitsetArray("c", $c);
echo "c: ";
foreach ($c as $byte) {
echo $byte . " ";
}
/*
run:
a: 01000001 01100101 01110010 01111001 01101110
b: 01000001 01101100 01100010 01110101 01110011
c: 00000000 00001001 00010000 00001100 00011101
c: 0 9 16 12 29
*/
