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# variant_mul

(PHP 5)

variant_mul -- multiplies the values of the two variants and returns the result

## Description

mixed variant_mul ( mixed left, mixed right )

Multiplies left by right and returns the result, subject to the following rules:

表格 1. Variant Multiplication Rules

If | Then
--- | ---
Both expressions are of the string, date, character, boolean type | Multiplication
One expression is a string type and the other a character | Multiplication
One expression is numeric and the other is a string | Multiplication
Both expressions are numeric | Multiplication
Either expression is NULL | NULL is returned
Both expressions are empty | Empty string is returned

Boolean values are converted to -1 for `FALSE` and 0 for `TRUE`.

See also variant_div(), variant_idiv().

> 注: 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.

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