A bitwise-and-bitwise OR operation example in PHP _php tutorial

The bitwise and mainly is the binary number operation.

The code is as follows:
Copy CodeThe code is as follows:
$a = 1;
$b = 2;
$c = $a ^b;
echo $c//3
?>

This is not a purely additive relationship.
Decimal 1 converted to binary 00000001
Decimal 2 converted to binary 00000010
The bitwise ^ 00000011//Is different is counted as 1 ^_^
And then
Copy CodeThe code is as follows:
$a = 1;
$b = 2;
echo $a & $c; 1
?>

Decimal 3 converted to binary 00000011
Decimal 1 converted to binary 00000001
Bitwise & 00000001//Is the same as each single digit, otherwise it will be counted as 0
Finally introduce the following usage; The bitwise & return value is meaningless. It is mainly used to determine if $ A is present in $c//permission usage is much more.
Copy CodeThe code is as follows:
$my _privilege = 15; 1+2+4+8 has full privileges
$Pri = ";
$privilege _arr = Array (8=> ' increase ', 4=> ' delete ',2=> ' change ',1=> ');
foreach ($privilege _arr as $k = + $v) {
$k & $my _privilege && $Pri. = ' I have '. $v. ' Power
';
}
Echo $Pri;
?>

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