variant_add

(PHP 5, PHP 7)

"Adds" two variant values together and returns the result

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:

**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

Parameters:

left

The left operand.

right

The right operand.

Returns:

Returns the result.