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143 lines
17 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<title>取得文件的权限</title>
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</head>
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<body class="docs"><div id="layout">
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<div id="layout-content"><div id="function.fileperms" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">fileperms</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">fileperms</span> — <span class="dc-title">取得文件的权限</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.fileperms-description">
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<h3 class="title">说明</h3>
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<div class="methodsynopsis dc-description">
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<span class="methodname"><strong>fileperms</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$filename</code></span>
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) : <span class="type">int</span></div>
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<p class="para rdfs-comment">
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取得文件的权限。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.fileperms-parameters">
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<h3 class="title">参数</h3>
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<p class="para">
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<dl>
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<dt>
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<code class="parameter">filename</code></dt>
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<dd>
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<p class="para">
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文件的路径。
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</p>
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</dd>
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</dl>
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</p>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.fileperms-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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以数字模式返回文件的访问权限。
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Returns the file's permissions as a numeric mode.
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Lower bits of this mode
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are the same as the permissions expected by <span class="function"><a href="chmod.html" class="function">chmod()</a></span>,
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however on most platforms the return value will also include information on
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the type of file given as <code class="parameter">filename</code>. The examples
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below demonstrate how to test the return value for specific permissions and
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file types on POSIX systems, including Linux and Mac OS X.
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</p>
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<p class="para">
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For local files, the specific return value is that of the
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<em>st_mode</em> member of the structure returned by the C
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library's <span class="function"><a href="stat.html" class="function">stat()</a></span> function. Exactly which bits are set
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can vary from platform to platform, and looking up your specific platform's
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documentation is recommended if parsing the non-permission bits of the
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return value is required.
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.fileperms-examples">
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<h3 class="title">范例</h3>
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<p class="para">
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<div class="example" id="example-2791">
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<p><strong>Example #1 以八进制的形式显示文件的权限</strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">substr</span><span style="color: #007700">(</span><span style="color: #0000BB">sprintf</span><span style="color: #007700">(</span><span style="color: #DD0000">'%o'</span><span style="color: #007700">, </span><span style="color: #0000BB">fileperms</span><span style="color: #007700">(</span><span style="color: #DD0000">'/tmp'</span><span style="color: #007700">)), -</span><span style="color: #0000BB">4</span><span style="color: #007700">);<br />echo </span><span style="color: #0000BB">substr</span><span style="color: #007700">(</span><span style="color: #0000BB">sprintf</span><span style="color: #007700">(</span><span style="color: #DD0000">'%o'</span><span style="color: #007700">, </span><span style="color: #0000BB">fileperms</span><span style="color: #007700">(</span><span style="color: #DD0000">'/etc/passwd'</span><span style="color: #007700">)), -</span><span style="color: #0000BB">4</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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<div class="example-contents"><p>以上例程会输出：</p></div>
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<div class="example-contents screen">
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<div class="cdata"><pre>
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1777
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0644
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</pre></div>
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</div>
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</div>
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<div class="example" id="example-2792">
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<p><strong>Example #2 输出全部权限</strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br />$perms </span><span style="color: #007700">= </span><span style="color: #0000BB">fileperms</span><span style="color: #007700">(</span><span style="color: #DD0000">'/etc/passwd'</span><span style="color: #007700">);<br /><br />if ((</span><span style="color: #0000BB">$perms </span><span style="color: #007700">& </span><span style="color: #0000BB">0xC000</span><span style="color: #007700">) == </span><span style="color: #0000BB">0xC000</span><span style="color: #007700">) {<br /> </span><span style="color: #FF8000">// Socket<br /> </span><span style="color: #0000BB">$info </span><span style="color: #007700">= </span><span style="color: #DD0000">'s'</span><span style="color: #007700">;<br />} elseif ((</span><span style="color: #0000BB">$perms </span><span style="color: #007700">& </span><span style="color: #0000BB">0xA000</span><span style="color: #007700">) == </span><span style="color: #0000BB">0xA000</span><span style="color: #007700">) {<br /> </span><span style="color: #FF8000">// Symbolic Link<br /> </span><span style="color: #0000BB">$info </span><span style="color: #007700">= </span><span style="color: #DD0000">'l'</span><span style="color: #007700">;<br />} elseif ((</span><span style="color: #0000BB">$perms </span><span style="color: #007700">& </span><span style="color: #0000BB">0x8000</span><span style="color: #007700">) == </span><span style="color: #0000BB">0x8000</span><span style="color: #007700">) {<br /> </span><span style="color: #FF8000">// Regular<br /> </span><span style="color: #0000BB">$info </span><span style="color: #007700">= </span><span style="color: #DD0000">'-'</span><span style="color: #007700">;<br />} elseif ((</span><span style="color: #0000BB">$perms </span><span style="color: #007700">& </span><span style="color: #0000BB">0x6000</span><span style="color: #007700">) == </span><span style="color: #0000BB">0x6000</span><span style="color: #007700">) {<br /> </span><span style="color: #FF8000">// Block special<br /> </span><span style="color: #0000BB">$info </span><span style="color: #007700">= </span><span style="color: #DD0000">'b'</span><span style="color: #007700">;<br />} elseif ((</span><span style="color: #0000BB">$perms </span><span style="color: #007700">& </span><span style="color: #0000BB">0x4000</span><span style="color: #007700">) == </span><span style="color: #0000BB">0x4000</span><span style="color: #007700">) {<br /> </span><span style="color: #FF8000">// Directory<br /> </span><span style="color: #0000BB">$info </span><span style="color: #007700">= </span><span style="color: #DD0000">'d'</span><span style="color: #007700">;<br />} elseif ((</span><span style="color: #0000BB">$perms </span><span style="color: #007700">& </span><span style="color: #0000BB">0x2000</span><span style="color: #007700">) == </span><span style="color: #0000BB">0x2000</span><span style="color: #007700">) {<br /> </span><span style="color: #FF8000">// Character special<br /> </span><span style="color: #0000BB">$info </span><span style="color: #007700">= </span><span style="color: #DD0000">'c'</span><span style="color: #007700">;<br />} elseif ((</span><span style="color: #0000BB">$perms </span><span style="color: #007700">& </span><span style="color: #0000BB">0x1000</span><span style="color: #007700">) == </span><span style="color: #0000BB">0x1000</span><span style="color: #007700">) {<br /> </span><span style="color: #FF8000">// FIFO pipe<br /> </span><span style="color: #0000BB">$info </span><span style="color: #007700">= </span><span style="color: #DD0000">'p'</span><span style="color: #007700">;<br />} else {<br /> </span><span style="color: #FF8000">// Unknown<br /> </span><span style="color: #0000BB">$info </span><span style="color: #007700">= </span><span style="color: #DD0000">'u'</span><span style="color: #007700">;<br />}<br /><br /></span><span style="color: #FF8000">// Owner<br /></span><span style="color: #0000BB">$info </span><span style="color: #007700">.= ((</span><span style="color: #0000BB">$perms </span><span style="color: #007700">& </span><span style="color: #0000BB">0x0100</span><span style="color: #007700">) ? </span><span style="color: #DD0000">'r' </span><span style="color: #007700">: </span><span style="color: #DD0000">'-'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$info </span><span style="color: #007700">.= ((</span><span style="color: #0000BB">$perms </span><span style="color: #007700">& </span><span style="color: #0000BB">0x0080</span><span style="color: #007700">) ? </span><span style="color: #DD0000">'w' </span><span style="color: #007700">: </span><span style="color: #DD0000">'-'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$info </span><span style="color: #007700">.= ((</span><span style="color: #0000BB">$perms </span><span style="color: #007700">& </span><span style="color: #0000BB">0x0040</span><span style="color: #007700">) ?<br /> ((</span><span style="color: #0000BB">$perms </span><span style="color: #007700">& </span><span style="color: #0000BB">0x0800</span><span style="color: #007700">) ? </span><span style="color: #DD0000">'s' </span><span style="color: #007700">: </span><span style="color: #DD0000">'x' </span><span style="color: #007700">) :<br /> ((</span><span style="color: #0000BB">$perms </span><span style="color: #007700">& </span><span style="color: #0000BB">0x0800</span><span style="color: #007700">) ? </span><span style="color: #DD0000">'S' </span><span style="color: #007700">: </span><span style="color: #DD0000">'-'</span><span style="color: #007700">));<br /><br /></span><span style="color: #FF8000">// Group<br /></span><span style="color: #0000BB">$info </span><span style="color: #007700">.= ((</span><span style="color: #0000BB">$perms </span><span style="color: #007700">& </span><span style="color: #0000BB">0x0020</span><span style="color: #007700">) ? </span><span style="color: #DD0000">'r' </span><span style="color: #007700">: </span><span style="color: #DD0000">'-'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$info </span><span style="color: #007700">.= ((</span><span style="color: #0000BB">$perms </span><span style="color: #007700">& </span><span style="color: #0000BB">0x0010</span><span style="color: #007700">) ? </span><span style="color: #DD0000">'w' </span><span style="color: #007700">: </span><span style="color: #DD0000">'-'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$info </span><span style="color: #007700">.= ((</span><span style="color: #0000BB">$perms </span><span style="color: #007700">& </span><span style="color: #0000BB">0x0008</span><span style="color: #007700">) ?<br /> ((</span><span style="color: #0000BB">$perms </span><span style="color: #007700">& </span><span style="color: #0000BB">0x0400</span><span style="color: #007700">) ? </span><span style="color: #DD0000">'s' </span><span style="color: #007700">: </span><span style="color: #DD0000">'x' </span><span style="color: #007700">) :<br /> ((</span><span style="color: #0000BB">$perms </span><span style="color: #007700">& </span><span style="color: #0000BB">0x0400</span><span style="color: #007700">) ? </span><span style="color: #DD0000">'S' </span><span style="color: #007700">: </span><span style="color: #DD0000">'-'</span><span style="color: #007700">));<br /><br /></span><span style="color: #FF8000">// World<br /></span><span style="color: #0000BB">$info </span><span style="color: #007700">.= ((</span><span style="color: #0000BB">$perms </span><span style="color: #007700">& </span><span style="color: #0000BB">0x0004</span><span style="color: #007700">) ? </span><span style="color: #DD0000">'r' </span><span style="color: #007700">: </span><span style="color: #DD0000">'-'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$info </span><span style="color: #007700">.= ((</span><span style="color: #0000BB">$perms </span><span style="color: #007700">& </span><span style="color: #0000BB">0x0002</span><span style="color: #007700">) ? </span><span style="color: #DD0000">'w' </span><span style="color: #007700">: </span><span style="color: #DD0000">'-'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$info </span><span style="color: #007700">.= ((</span><span style="color: #0000BB">$perms </span><span style="color: #007700">& </span><span style="color: #0000BB">0x0001</span><span style="color: #007700">) ?<br /> ((</span><span style="color: #0000BB">$perms </span><span style="color: #007700">& </span><span style="color: #0000BB">0x0200</span><span style="color: #007700">) ? </span><span style="color: #DD0000">'t' </span><span style="color: #007700">: </span><span style="color: #DD0000">'x' </span><span style="color: #007700">) :<br /> ((</span><span style="color: #0000BB">$perms </span><span style="color: #007700">& </span><span style="color: #0000BB">0x0200</span><span style="color: #007700">) ? </span><span style="color: #DD0000">'T' </span><span style="color: #007700">: </span><span style="color: #DD0000">'-'</span><span style="color: #007700">));<br /><br />echo </span><span style="color: #0000BB">$info</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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<div class="example-contents"><p>以上例程会输出：</p></div>
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<div class="example-contents screen">
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<div class="cdata"><pre>
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-rw-r--r--
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</pre></div>
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</div>
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</div>
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</p>
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</div>
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<div class="refsect1 errors" id="refsect1-function.fileperms-errors">
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<h3 class="title">错误／异常</h3>
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<p class="para">
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失败时抛出<strong><code>E_WARNING</code></strong>警告。
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</p>
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</div>
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<div class="refsect1 notes" id="refsect1-function.fileperms-notes">
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<h3 class="title">注释</h3>
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<blockquote class="note"><p><strong class="note">Note</strong>: <span class="simpara">此函数的结果会被缓存。参见
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<span class="function"><a href="clearstatcache.html" class="function">clearstatcache()</a></span> 以获得更多细节。</span></p></blockquote>
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<div class="tip"><strong class="tip">Tip</strong><p class="simpara">自 PHP 5.0.0 起, 此函数也用于<em class="emphasis">某些</em>
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URL 包装器。请参见 <a href="wrappers.html" class="xref">支持的协议和封装协议</a>以获得支持 <span class="function"><a href="stat.html" class="function">stat()</a></span> 系列函数功能的包装器列表。</p></div>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.fileperms-seealso">
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<h3 class="title">参见</h3>
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<p class="para">
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<ul class="simplelist">
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<li class="member"><span class="function"><a href="chmod.html" class="function" rel="rdfs-seeAlso">chmod()</a> - 改变文件模式</span></li>
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<li class="member"><span class="function"><a href="is_readable.html" class="function" rel="rdfs-seeAlso">is_readable()</a> - 判断给定文件名是否可读</span></li>
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<li class="member"><span class="function"><a href="stat.html" class="function" rel="rdfs-seeAlso">stat()</a> - 给出文件的信息</span></li>
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</ul>
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</p>
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</div>
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</div></div></div></body></html> |