COM Functions
PHP Manual


(PHP 5, PHP 7)

variant_mulMultiplies the values of the two variants


mixed variant_mul ( mixed $left , mixed $right )

Multiplies left by right.



The left operand.


The right operand.

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


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.

Return Values

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

See Also

COM Functions
PHP Manual