variant_and

(PHP 5, PHP 7, PHP 8)

variant_and — Performs a bitwise AND operation between two variants

说明

variant_and(mixed $left, mixed $right): variant

Performs a bitwise AND operation. Note that this is slightly different from a regular AND operation.

参数

left: The left operand.
right: The right operand.

注意:
对于所有变量运算函数，本函数的参数可以是 PHP 内置的类型（整数，字符串，浮点数，布尔型或者 null），或者是一个 COM，VARIANT 或者 DOTNET 类的实例。PHP 内置类型将会使用和构造variant类相同的规则转换成变量。COM 和 DOTNET 对象的值将会取其默认属性并被当成变量值使用。

变量运算函数是同名函数在 COM 库中的外包；有关此类函数的更多信息参见 MSDN 库。PHP 函数命名有少许区别，例如 PHP 中的 variant_add() 对应于 MSDN 文档中的 VarAdd()。

返回值

**Variant AND Rules**
If `left` is	If `right` is	then the result is
`true`	`true`	`true`
`true`	`false`	`false`
`true`	`null`	`null`
`false`	`true`	`false`
`false`	`false`	`false`
`false`	`null`	`false`
`null`	`true`	`null`
`null`	`false`	`false`
`null`	`null`	`null`

错误／异常

Throws a com_exception on failure.

参见

variant_or() - Performs a logical disjunction on two variants

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