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_readable</H1
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><P
>    (PHP 3, PHP 4, PHP 5)</P
>is_readable&nbsp;--&nbsp;判断给定文件名是否可读</DIV
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><H2
>说明</H2
>bool <B
CLASS="methodname"
>is_readable</B
> ( string filename )<BR
></BR
><P
>&#13;   如果由 <CODE
CLASS="parameter"
>filename</CODE
>
   指定的文件或目录存在并且可读则返回 <TT
CLASS="constant"
><B
>TRUE</B
></TT
>。
  </P
><P
>&#13;   记住 PHP 也许只能以运行 webserver 的用户名（通常为
   'nobody'）来访问文件。不计入安全模式的限制。
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>例 1. <B
CLASS="function"
>is_readable()</B
> 例子</B
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><code><font color="#000000">
<font color="#0000BB">&lt;?php<br />$filename </font><font color="#007700">= </font><font color="#DD0000">'test.txt'</font><font color="#007700">;<br />if (</font><font color="#0000BB">is_readable</font><font color="#007700">(</font><font color="#0000BB">$filename</font><font color="#007700">)) {<br />&nbsp;&nbsp;&nbsp;&nbsp;echo </font><font color="#DD0000">'The file is readable'</font><font color="#007700">;<br />} else {<br />&nbsp;&nbsp;&nbsp;&nbsp;echo </font><font color="#DD0000">'The file is not readable'</font><font color="#007700">;<br />}<br /></font><font color="#0000BB">?&gt;</font>
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>
  </P
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><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
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><B
>提示: </B
>自 <TT
CLASS="literal"
>PHP 5.0.0</TT
>
起本函数也可被<SPAN
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>某些</I
></SPAN
> URL wrapper 使用。参考<A
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>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
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><P
>&#13;   参见 <A
HREF="function.is-writable.html"
><B
CLASS="function"
>is_writable()</B
></A
>，<A
HREF="function.file-exists.html"
><B
CLASS="function"
>file_exists()</B
></A
>
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><B
CLASS="function"
>fgets()</B
></A
>。
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