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

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>is_scalar</H1
><DIV
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><A
NAME="AEN236760"
></A
><P
>    (PHP 4 &#62;= 4.0.5, PHP 5)</P
>is_scalar&nbsp;--&nbsp;
     检测变量是否是一个标量
    </DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN236763"
></A
><H2
>描述</H2
>bool <B
CLASS="methodname"
>is_scalar</B
> ( mixed var )<BR
></BR
><P
>&#13;     如果给出的变量参数 <CODE
CLASS="parameter"
>var</CODE
> 是一个标量,<B
CLASS="function"
>is_scalar()</B
>
     返回 <TT
CLASS="constant"
><B
>TRUE</B
></TT
>,否则返回 <TT
CLASS="constant"
><B
>FALSE</B
></TT
>。
    </P
><P
>&#13;     标量变量是指那些包含了
     <A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>、<A
HREF="language.types.float.html"
><B
CLASS="type"
>float</B
></A
>、<A
HREF="language.types.string.html"
><B
CLASS="type"
>string</B
></A
> 
     或 <A
HREF="language.types.boolean.html"
><B
CLASS="type"
>boolean</B
></A
>的变量,而 
     <A
HREF="language.types.array.html"
><B
CLASS="type"
>array</B
></A
>、<A
HREF="language.types.object.html"
><B
CLASS="type"
>object</B
></A
> 和 <A
HREF="language.types.resource.html"
><B
CLASS="type"
>resource</B
></A
> 则不是标量。
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><code><font color="#000000">
<font color="#0000BB">&lt;?php<br /></font><font color="#007700">function </font><font color="#0000BB">show_var</font><font color="#007700">(</font><font color="#0000BB">$var</font><font color="#007700">) {<br />&nbsp;&nbsp;&nbsp;&nbsp;if (</font><font color="#0000BB">is_scalar</font><font color="#007700">(</font><font color="#0000BB">$var</font><font color="#007700">)) {<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;echo </font><font color="#0000BB">$var</font><font color="#007700">;<br />&nbsp;&nbsp;&nbsp;&nbsp;} else {<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">var_dump</font><font color="#007700">(</font><font color="#0000BB">$var</font><font color="#007700">);<br />&nbsp;&nbsp;&nbsp;&nbsp;}<br />}<br /></font><font color="#0000BB">$pi </font><font color="#007700">= </font><font color="#0000BB">3.1416</font><font color="#007700">;<br /></font><font color="#0000BB">$proteins </font><font color="#007700">= array(</font><font color="#DD0000">"hemoglobin"</font><font color="#007700">, </font><font color="#DD0000">"cytochrome c oxidase"</font><font color="#007700">, </font><font color="#DD0000">"ferredoxin"</font><font color="#007700">);<br /><br /></font><font color="#0000BB">show_var</font><font color="#007700">(</font><font color="#0000BB">$pi</font><font color="#007700">);<br /></font><font color="#FF8000">// 打印:3.1416<br /><br /></font><font color="#0000BB">show_var</font><font color="#007700">(</font><font color="#0000BB">$proteins</font><font color="#007700">)<br /></font><font color="#FF8000">// 打印:<br />// array(3) {<br />//&nbsp;&nbsp;&nbsp;[0]=&gt;<br />//&nbsp;&nbsp;&nbsp;string(10) "hemoglobin"<br />//&nbsp;&nbsp;&nbsp;[1]=&gt;<br />//&nbsp;&nbsp;&nbsp;string(20) "cytochrome c oxidase"<br />//&nbsp;&nbsp;&nbsp;[2]=&gt;<br />//&nbsp;&nbsp;&nbsp;string(10) "ferredoxin"<br />// }<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
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>
    </P
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>注意: </B
>
      尽管当前的 <A
HREF="language.types.resource.html"
><B
CLASS="type"
>resource</B
></A
> 类型是居于整数的,但 
      <B
CLASS="function"
>is_scalar()</B
> 不会把它们当作是标量,因为资源是抽象数据类型。不能依赖于执行细节,因为它可能会改变。
     </P
></BLOCKQUOTE
></DIV
><P
>&#13;     参见 <A
HREF="function.is-bool.html"
><B
CLASS="function"
>is_bool()</B
></A
>、<A
HREF="function.is-numeric.html"
><B
CLASS="function"
>is_numeric()</B
></A
>、<A
HREF="function.is-float.html"
><B
CLASS="function"
>is_float()</B
></A
>、<A
HREF="function.is-int.html"
><B
CLASS="function"
>is_int()</B
></A
>、<A
HREF="function.is-real.html"
><B
CLASS="function"
>is_real()</B
></A
>、<A
HREF="function.is-string.html"
><B
CLASS="function"
>is_string()</B
></A
>、<A
HREF="function.is-object.html"
><B
CLASS="function"
>is_object()</B
></A
>、<A
HREF="function.is-array.html"
><B
CLASS="function"
>is_array()</B
></A
>
     和 <A
HREF="function.is-integer.html"
><B
CLASS="function"
>is_integer()</B
></A
>。
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