variant_add

(PHP 5, PHP 7)

variant_add — "Adds" two variant values together and returns the result

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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

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left

The left operand.

right

The right operand.

Note:

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Returns the result.

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