第七章 PHP3 表达式
位操作符
位操作符允许您精细的操作数据的每一个位。
Table 7-2. Bitwise Operators（表7-2位操作符）
| example | name | result |
| $a & $b | And | Bits that are set in both $a and $b are set.?/FONT> |
| $a | $b | Or | Bits that are set in either $a or $b are set.?/FONT> |
| ~ $a?/FONT> | Not | Bits that are set in $a are not set, and vice versa. |