variant_add

(PHP 5)

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

說明

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

參數

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

Note:
對於所有變數運算函式，本函式的參數可以是 PHP 內建的類型（整數，字串，浮點數，布林值或者 NULL），或者是一個 COM，VARIANT 或者 DOTNET 類別的實體。PHP 內建類型將會使用和建構VARIANT類型相同的規則轉換成變數。COM 和 DOTNET 物件的值將會其預設屬性並被當成變數值使用。

變數運算函式是同名函式在 COM 函式庫中的外包；有關此類函式的更多訊息參見 MSDN 函式庫。PHP 函式命名有少許區別，例如 PHP 中的 variant_add() 對應於 MSDN 文件中的 VarAdd()。

回傳值

Returns the result.

參見

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

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