PHP: Subtracts the value of the right variant from the left variant value

Description

mixed variant_sub ( mixed $left , mixed $right )

Subtracts right from left .

Parameters

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.

Return Values

Variant Subtraction Rules

If Then

Both expressions are of the string type Subtraction

One expression is a string type and the other a character Subtraction

One expression is numeric and the other is a string Subtraction.

Both expressions are numeric Subtraction

Either expression is NULL NULL is returned

Both expressions are empty Empty string is returned

variant_sub

Description

Parameters

Return Values

See Also