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 in this string.
<?php 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 10-3. Bitwise Operators
Example | Name | Result |
---|---|---|
$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. |
~ $a | Not | 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") |