Usually in PHP one does not take much care about the data types, but
in this case you absoloodle have to.
If you use bit operators on a character then its ascii number will be
taken instead (how should a number based operation work with a
string?)
also if you pass on $_GET params directly into ay bitwise operation
you might get some un-nice behaviour. So check them first.
<?php
$a = $b = false;
if (is_numeric($_GET['b'].$_GET['a'])) {
$a = (int)$_GET['a'];
$b = (int)$_GET['b'];
echo $a & $b;
}
?>
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