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variant_add

"Adds" two variant values together and returns the result (PHP 5)
mixed variant_add ( mixed left, mixed right )

Adds left to right using the following rules (taken from the MSDN library), which correspond to those of Visual Basic:

Table 27. Variant Addition Rules

IfThen
Both expressions are of the string typeConcatenation
One expression is a string type and the other a characterAddition
One expression is numeric and the other is a stringAddition
Both expressions are numericAddition
Either expression is NULLNULL is returned
Both expressions are emptyInteger subtype is returned


See also variant_sub().

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.