第七章 PHP3 表达式
逻辑操作符
Table 7-3. Logical Operators(表7-3 逻辑操作符)
example | name | result?/FONT> |
$a and $b | And | True of both $a and $b are true.?/FONT> |
$a or $b | Or?/FONT> | True if either $a or $b is true.?/FONT> |
$a xor $b | Or?/FONT> | True if either $a or $b is true, but not both.?/FONT> |
! $a | Not?/FONT> | True if $a is not true.?/FONT> |
$a && $b | And?/FONT> | True of both $a and $b are true.?/FONT> |
$a || $b | Or?/FONT> | True if either $a or $b is true. |
两种不同“and”和“or”操作符的变化实际上是由于操作的不同优先级别而造成的。(参考以下内容。)