php - chart for xor bitwise operator ^?

Question

Is there a char with all the outputs? Or is the only way to figure them out is with trial and error?

For example

    <?php

    echo "A" ^ "{"; //outputs :

    ?>

Thanks.

Answer 1

There is no need for such a chart; the operation is perfectly predictable without one. Bitwise operations on PHP strings are performed on the individual bytes making up the string; for instance, in your example:

ord("A") = 0x41
ord("{") = 0x7b
           0x41 ^ 0x7b = 0x3a
                     chr(0x3a) = ":"