Bitwise operators allow you to turn specific bits within an
integer on or off. If both the left- and right-hand parameters are
strings, the bitwise operator will operate on the characters' ASCII
echo 12 ^ 9; // Outputs '5'
echo "12" ^ "9"; // Outputs the Backspace character (ascii 8)
// ('1' (ascii 49)) ^ ('9' (ascii 57)) = #8
echo "hallo" ^ "hello"; // Outputs the ascii values #0 #4 #0 #0 #0
// 'a' ^ 'e' = #4
Table 15-3. Bitwise Operators
|$a & $b||And||Bits that are set in both $a and $b are set.|
|$a | $b||Or||Bits that are set in either $a or $b are set.|
|$a ^ $b||Xor||
Bits that are set in $a or $b but not both are set.
Bits that are set in $a are not set, and vice versa.
|$a << $b||Shift left||
Shift the bits of $a $b steps to the left (each step means
"multiply by two")
|$a >> $b||Shift right||
Shift the bits of $a $b steps to the right (each step means
"divide by two")
Don't right shift for more than 32 bits on 32 bits systems. Don't left shift
in case it results to number longer than 32 bits.