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<?php
$aa = 'a'^'b';
$bb = chr(ord('a') ^ ord('b'));
//var_dump($aa);
//var_dump($bb);
var_dump(ord('a') ^ ord('b'));
var_dump(ord('a' ^ 'b'));
int(3)
int(3)
$aa= 'a'^'b';
$bb= chr(ord('a')^ord('b'));
var_dump($aa);
var_dump($bb);
echo ord($aa),ord($bb);
string(1) ""
string(1) ""
33