variant_imp Performs a bitwise implication on two variants


variant_imp

(PHP 5)

variant_impPerforms a bitwise implication on two variants

说明

mixed variant_imp ( mixed $left , mixed $right )

Performs a bitwise implication operation.

参数

left

The left operand.

right

The right operand.

Note:

As with all the variant arithmetic functions, the parameters for this function can be either a PHP native type (integer, string, floating point, boolean or NULL), or an instance of a COM, VARIANT or DOTNET class. PHP native types will be converted to variants using the same rules as found in the constructor for the VARIANT class. COM and DOTNET objects will have the value of their default property taken and used as the variant value.

The variant arithmetic functions are wrappers around the similarly named functions in the COM library; for more information on these functions, consult the MSDN library. The PHP functions are named slightly differently; for example variant_add() in PHP corresponds to VarAdd() in the MSDN documentation.

返回值

Variant Implication Table
If left is If right is then the result is
TRUETRUETRUE
TRUEFALSETRUE
TRUENULLTRUE
FALSETRUETRUE
FALSEFALSETRUE
FALSENULLTRUE
NULLTRUETRUE
NULLFALSENULL
NULLNULLNULL


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