variant_div
Description
mixed variant_div ( mixed left, mixed right )Divides left by right and returns the result, subject to the following rules:
表格 1. Variant Division Rules
| If | Then |
|---|---|
| Both expressions are of the string, date, character, boolean type | Double is returned |
| One expression is a string type and the other a character | Division and a double is returned |
| One expression is numeric and the other is a string | Division and a double is returned. |
| Both expressions are numeric | Division and a double is returned |
| Either expression is NULL | NULL is returned |
| right is empty and left is anything but empty | A com_exception with code DISP_E_DIVBYZERO is thrown |
| left is empty and right is anything but empty. | 0 as type double is returned |
| Both expressions are empty | A com_exception with code DISP_E_OVERFLOW is thrown |
注: 對於所有的變量算法函數，此函數的參數可以要麼是 PHP 自身的類型（整型，字串，浮點型，布爾型或是 NULL），要麼是一個 COM，VARIANT 或 DOTNET 類的案例。PHP 自身類型將被轉換為變量，使用與 VARIANT 類的構造函數中相同的規則。COM 和 DOTNET 物件將具有其預設屬性的值，取得並作為變量值使用。
變量算法函數是 COM 庫中與其名稱接近的函數的封裝。此類函數的更多訊息請參考 MSDN 庫。PHP 函數命名有少許不同，例如 PHP 中的 variant_add() 對應於 MSDN 文件中的 VarAdd()。