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131 lines
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HTML
131 lines
7.8 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>改变文件模式</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.chmod" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">chmod</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">chmod</span> — <span class="dc-title">改变文件模式</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.chmod-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>chmod</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$filename</code></span>
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, <span class="methodparam"><span class="type">int</span> <code class="parameter">$mode</code></span>
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) : <span class="type">bool</span></div>
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<p class="para rdfs-comment">
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尝试将 <code class="parameter">filename</code> 所指定文件的模式改成
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<code class="parameter">mode</code> 所给定的。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.chmod-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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<dt>
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<code class="parameter">mode</code></dt>
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<dd>
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<p class="para">
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注意 <code class="parameter">mode</code> 不会被自动当成八进制数值，而且也不能用字符串（例如 "g+w"）。要确保正确操作，需要给
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<code class="parameter">mode</code> 前面加上 0：
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</p>
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<p class="para">
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<div class="informalexample">
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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 />chmod</span><span style="color: #007700">(</span><span style="color: #DD0000">"/somedir/somefile"</span><span style="color: #007700">, </span><span style="color: #0000BB">755</span><span style="color: #007700">); </span><span style="color: #FF8000">// 十进制数，可能不对<br /></span><span style="color: #0000BB">chmod</span><span style="color: #007700">(</span><span style="color: #DD0000">"/somedir/somefile"</span><span style="color: #007700">, </span><span style="color: #DD0000">"u+rwx,go+rx"</span><span style="color: #007700">); </span><span style="color: #FF8000">// 字符串，不对<br /></span><span style="color: #0000BB">chmod</span><span style="color: #007700">(</span><span style="color: #DD0000">"/somedir/somefile"</span><span style="color: #007700">, </span><span style="color: #0000BB">0755</span><span style="color: #007700">); </span><span style="color: #FF8000">// 八进制数，正确的 mode 值<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>
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</p>
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<p class="para">
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<code class="parameter">mode</code> 参数包含三个八进制数按顺序分别指定了所有者、所有者所在的组以及所有人的访问限制。每一部分都可以通过加入所需的权限来计算出所要的权限。数字 1
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表示使文件可执行，数字 2 表示使文件可写，数字 4
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表示使文件可读。加入这些数字来制定所需要的权限。有关 UNIX 系统的文件权限可以阅读手册“<strong class="command">man 1
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chmod</strong>”和“<strong class="command">man 2 chmod</strong>”。
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</p>
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<p class="para">
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<div class="informalexample">
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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: #FF8000">// Read and write for owner, nothing for everybody else<br /></span><span style="color: #0000BB">chmod</span><span style="color: #007700">(</span><span style="color: #DD0000">"/somedir/somefile"</span><span style="color: #007700">, </span><span style="color: #0000BB">0600</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// Read and write for owner, read for everybody else<br /></span><span style="color: #0000BB">chmod</span><span style="color: #007700">(</span><span style="color: #DD0000">"/somedir/somefile"</span><span style="color: #007700">, </span><span style="color: #0000BB">0644</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// Everything for owner, read and execute for others<br /></span><span style="color: #0000BB">chmod</span><span style="color: #007700">(</span><span style="color: #DD0000">"/somedir/somefile"</span><span style="color: #007700">, </span><span style="color: #0000BB">0755</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// Everything for owner, read and execute for owner's group<br /></span><span style="color: #0000BB">chmod</span><span style="color: #007700">(</span><span style="color: #DD0000">"/somedir/somefile"</span><span style="color: #007700">, </span><span style="color: #0000BB">0750</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>
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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.chmod-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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成功时返回 <strong><code>TRUE</code></strong>， 或者在失败时返回 <strong><code>FALSE</code></strong>。
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</p>
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</div>
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<div class="refsect1 notes" id="refsect1-function.chmod-notes">
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<h3 class="title">注释</h3>
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<p class="para">
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当前用户指的是执行 PHP 的用户。很可能和通常的 shell 或者 FTP
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用户不是同一个。在大多数系统下文件模式只能被文件所有者的用户改变。
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</p>
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</p></blockquote>
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<blockquote class="note"><p><strong class="note">Note</strong>: <span class="simpara">此函数不能作用于<a href="features.remote_files.html" class="link">远程文件</a>，被检查的文件必须是可通过服务器的文件系统访问的。</span></p></blockquote>
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<p class="para">
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当<a href="ini.sect.safe-mode.html#ini.safe-mode" class="link">安全模式</a>打开的时候，PHP 会检查所操作的文件是否和正在执行的脚本具有相同的
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UID （所有者）。要注意的是，不能修改 SUID，SGID 和 sticky bits。
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</p>
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</p></blockquote>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.chmod-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="chown.html" class="function" rel="rdfs-seeAlso">chown()</a> - 改变文件的所有者</span></li>
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<li class="member"><span class="function"><a href="chgrp.html" class="function" rel="rdfs-seeAlso">chgrp()</a> - 改变文件所属的组</span></li>
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<li class="member"><span class="function"><a href="fileperms.html" class="function" rel="rdfs-seeAlso">fileperms()</a> - 取得文件的权限</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> |