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_file</H1
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><P
>    (PHP 3, PHP 4, PHP 5)</P
>is_file&nbsp;--&nbsp;判断给定文件名是否为一个正常的文件</DIV
><DIV
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><A
NAME="AEN53998"
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><H2
>说明</H2
>bool <B
CLASS="methodname"
>is_file</B
> ( string filename )<BR
></BR
><P
>&#13;   如果文件存在且为正常的文件则返回 <TT
CLASS="constant"
><B
>TRUE</B
></TT
>。
  </P
><P
>&#13;   <TABLE
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>例 1. <B
CLASS="function"
>is_file()</B
> 例子</B
></P
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><code><font color="#000000">
<font color="#0000BB">&lt;?php<br />var_dump</font><font color="#007700">(</font><font color="#0000BB">is_file</font><font color="#007700">(</font><font color="#DD0000">'a_file.txt'</font><font color="#007700">)) . </font><font color="#DD0000">"\n"</font><font color="#007700">;<br /></font><font color="#0000BB">var_dump</font><font color="#007700">(</font><font color="#0000BB">is_file</font><font color="#007700">(</font><font color="#DD0000">'/usr/bin/'</font><font color="#007700">)) . </font><font color="#DD0000">"\n"</font><font color="#007700">;<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
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><P
>上例将输出：</P
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>bool(true)
bool(false)</PRE
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>
  </P
><DIV
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><BLOCKQUOTE
CLASS="note"
><P
><B
>注意: </B
>本函数的结果会被缓存。更多信息参见
<A
HREF="function.clearstatcache.html"
><B
CLASS="function"
>clearstatcache()</B
></A
>。</P
></BLOCKQUOTE
></DIV
><DIV
CLASS="tip"
><BLOCKQUOTE
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><P
><B
>提示: </B
>自 <TT
CLASS="literal"
>PHP 5.0.0</TT
>
起本函数也可被<SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>某些</I
></SPAN
> URL wrapper 使用。参考<A
HREF="wrappers.html"
>附录 N</A
> 来看哪些 wrapper 支持
<A
HREF="function.stat.html"
><B
CLASS="function"
>stat()</B
></A
> 系列函数的功能。</P
></BLOCKQUOTE
></DIV
><P
>&#13;   参见 <A
HREF="function.is-dir.html"
><B
CLASS="function"
>is_dir()</B
></A
> 和
   <A
HREF="function.is-link.html"
><B
CLASS="function"
>is_link()</B
></A
>。
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