Sophie: php-manual-zh-5.2.4-1mdv2008.1 noarch

php-manual-zh-5.2.4-1mdv2008.1.noarch.rpm

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>is_nan</H1
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><P
>    (PHP 4 &#62;= 4.2.0, PHP 5)</P
>is_nan&nbsp;--&nbsp;判断是否为合法数值</DIV
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>说明</H2
>bool <B
CLASS="methodname"
>is_nan</B
> ( float val )<BR
></BR
><P
>&#13;     如果 <CODE
CLASS="parameter"
>val</CODE
> 为“非数值”，例如
     <TT
CLASS="literal"
>acos(1.01)</TT
> 的结果，则返回 <TT
CLASS="constant"
><B
>TRUE</B
></TT
>。
    </P
><P
>&#13;     参见 <A
HREF="function.is-finite.html"
><B
CLASS="function"
>is_finite()</B
></A
> 和 <A
HREF="function.is-infinite.html"
><B
CLASS="function"
>is_infinite()</B
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>。
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