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>variant_mul</H1
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><P
> (PHP 5)</P
>variant_mul --
multiplies the values of the two variants and returns the result
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><DIV
CLASS="refsect1"
><A
NAME="AEN23038"
></A
><H2
>Description</H2
>mixed <B
CLASS="methodname"
>variant_mul</B
> ( mixed left, mixed right )<BR
></BR
><P
> Multiplies <CODE
CLASS="parameter"
>left</CODE
> by <CODE
CLASS="parameter"
>right</CODE
> and
returns the result, subject to the following rules:
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><A
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></A
><P
><B
>表 1. Variant Multiplication Rules</B
></P
><TABLE
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><COL><COL><THEAD
><TR
><TH
>If</TH
><TH
>Then</TH
></TR
></THEAD
><TBODY
><TR
><TD
>Both expressions are of the string, date, character, boolean type</TD
><TD
>Multiplication</TD
></TR
><TR
><TD
>One expression is a string type and the other a
character</TD
><TD
>Multiplication</TD
></TR
><TR
><TD
>One expression is numeric and the other is a string</TD
><TD
>Multiplication</TD
></TR
><TR
><TD
>Both expressions are numeric</TD
><TD
>Multiplication</TD
></TR
><TR
><TD
>Either expression is NULL</TD
><TD
>NULL is returned</TD
></TR
><TR
><TD
>Both expressions are empty</TD
><TD
>Empty string is returned</TD
></TR
></TBODY
></TABLE
></DIV
>
</P
><P
> Boolean values are converted to -1 for <TT
CLASS="constant"
><B
>FALSE</B
></TT
> and 0 for <TT
CLASS="constant"
><B
>TRUE</B
></TT
>.
</P
><P
> See also <A
HREF="function.variant-div.html"
><B
CLASS="function"
>variant_div()</B
></A
>,
<A
HREF="function.variant-idiv.html"
><B
CLASS="function"
>variant_idiv()</B
></A
>.
</P
><DIV
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><BLOCKQUOTE
CLASS="note"
><P
><B
>注意: </B
>
对于所有的变量算法函数，此函数的参数可以要么是 PHP
自身的类型（整型，字符串，浮点型，布尔型或者
<TT
CLASS="constant"
><B
>NULL</B
></TT
>），要么是一个 COM，VARIANT 或 DOTNET 类的实例。PHP
自身类型将被转换为变量，使用与 <A
HREF="class.variant.html"
>VARIANT</A
>
类的构造函数中相同的规则。COM 和 DOTNET 对象将具有其默认属性的值，取得并作为变量值使用。
</P
><P
> 变量算法函数是 COM 库中与其名称接近的函数的封装。此类函数的更多信息请参考
MSDN 库。PHP 函数命名有少许不同，例如 PHP 中的
variant_add() 对应于 MSDN 文档中的 VarAdd()。
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