(PHP 5, PHP 7, PHP 8)
variant_mul — Multiplies the values of the two variants
leftThe left operand.
rightThe right operand.
false and 0 for true.
注意:
對(duì)于所有變量運(yùn)算函數(shù)，本函數(shù)的參數(shù)可以是 PHP 內(nèi)置的類(lèi)型（整數(shù)，字符串，浮點(diǎn)數(shù)，布爾型或者
null），或者是一個(gè) COM，VARIANT 或者 DOTNET 類(lèi)的實(shí)例。PHP 內(nèi)置類(lèi)型將會(huì)使用和構(gòu)造variant類(lèi)相同的規(guī)則轉(zhuǎn)換成變量。COM 和 DOTNET 對(duì)象的值將會(huì)取其默認(rèn)屬性并被當(dāng)成變量值使用。變量運(yùn)算函數(shù)是同名函數(shù)在 COM 庫(kù)中的外包；有關(guān)此類(lèi)函數(shù)的更多信息參見(jiàn) MSDN 庫(kù)。PHP 函數(shù)命名有少許區(qū)別，例如 PHP 中的 variant_add() 對(duì)應(yīng)于 MSDN 文檔中的
VarAdd()。
| If | Then |
|---|---|
| Both expressions are of the string, date, character, boolean type | Multiplication |
| One expression is a string type and the other a character | Multiplication |
| One expression is numeric and the other is a string | Multiplication |
| Both expressions are numeric | Multiplication |
| Either expression is NULL | NULL is returned |
| Both expressions are empty | Empty string is returned |
Throws a com_exception on failure.