"Adds" two variant values together and returns the result

说锟斤拷

variant_add ( mixed $left , mixed $right ) : mixed

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

**Variant Addition Rules**
If	Then
Both expressions are of the string type	Concatenation
One expression is a string type and the other a character	Addition
One expression is numeric and the other is a string	Addition
Both expressions are numeric	Addition
Either expression is NULL	NULL is returned
Both expressions are empty	Integer subtype is returned

锟斤拷锟斤拷

left: The left operand.
right: The right operand.

Note:
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锟斤拷锟斤拷值

Returns the result.

锟轿硷拷

variant_sub() - Subtracts the value of the right variant from the left variant value