CakeFest 2024: The Official CakePHP Conference

variant_and

(PHP 5, PHP 7, PHP 8)

variant_andPerforms 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
truetruetrue
truefalsefalse
truenullnull
falsetruefalse
falsefalsefalse
falsenullfalse
nulltruenull
nullfalsefalse
nullnullnull

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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