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https://github.com/fofolee/uTools-Manuals.git
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170 lines
7.8 KiB
HTML
170 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>返回路径中的目录部分</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.dirname" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">dirname</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">dirname</span> — <span class="dc-title">返回路径中的目录部分</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.dirname-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>dirname</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$path</code></span>
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) : <span class="type">string</span></div>
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<p class="para rdfs-comment">
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给出一个包含有指向一个文件的全路径的字符串，本函数返回去掉文件名后的目录名。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.dirname-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">path</code></dt>
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<dd>
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<p class="para">
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一个路径。
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</p>
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<p class="para">
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在 Windows 中，斜线（<em>/</em>）和反斜线（<em>\</em>）都可以用作目录分隔符。在其它环境下是斜线（<em>/</em>）。
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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.dirname-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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返回 path 的父目录。
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如果在 <code class="parameter">path</code>
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中没有斜线，则返回一个点（'<em>.</em>'），表示当前目录。否则返回的是把
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<code class="parameter">path</code> 中结尾的
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<em>/component</em>（最后一个斜线以及后面部分）去掉之后的字符串。
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</p>
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</div>
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<div class="refsect1 changelog" id="refsect1-function.dirname-changelog">
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<h3 class="title">更新日志</h3>
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<p class="para">
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<table class="doctable informaltable">
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<thead>
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<tr>
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<th>版本</th>
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<th>说明</th>
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</tr>
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</thead>
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<tbody class="tbody">
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<tr>
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<td>5.0.0</td>
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<td>
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<span class="function"><strong>dirname()</strong></span> 的操作从 PHP 5.0.0 版开始是二进制安全的。
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</td>
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</tr>
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<tr>
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<td>4.0.3</td>
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<td>
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在这个版本中，<span class="function"><strong>dirname()</strong></span> 被修正为
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POSIX 兼容。
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</td>
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</tr>
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</tbody>
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</table>
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.dirname-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-2766">
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<p><strong>Example #1 <span class="function"><strong>dirname()</strong></span> 例子</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: #DD0000">"1) " </span><span style="color: #007700">. </span><span style="color: #0000BB">dirname</span><span style="color: #007700">(</span><span style="color: #DD0000">"/etc/passwd"</span><span style="color: #007700">) . </span><span style="color: #0000BB">PHP_EOL</span><span style="color: #007700">; </span><span style="color: #FF8000">// 1) /etc<br /></span><span style="color: #007700">echo </span><span style="color: #DD0000">"2) " </span><span style="color: #007700">. </span><span style="color: #0000BB">dirname</span><span style="color: #007700">(</span><span style="color: #DD0000">"/etc/"</span><span style="color: #007700">) . </span><span style="color: #0000BB">PHP_EOL</span><span style="color: #007700">; </span><span style="color: #FF8000">// 2) / (or \ on Windows)<br /></span><span style="color: #007700">echo </span><span style="color: #DD0000">"3) " </span><span style="color: #007700">. </span><span style="color: #0000BB">dirname</span><span style="color: #007700">(</span><span style="color: #DD0000">"."</span><span style="color: #007700">); </span><span style="color: #FF8000">// 3) .<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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</div>
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<div class="refsect1 notes" id="refsect1-function.dirname-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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<span class="function"><strong>dirname()</strong></span> operates naively on the input string,
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and is not aware of the actual filesystem, or path components such
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as "<em>..</em>".
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</p>
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</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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<span class="function"><strong>dirname()</strong></span> is locale aware, so for it to see the
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correct directory name with multibyte character paths, the matching locale must
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be set using the <span class="function"><a href="setlocale.html" class="function">setlocale()</a></span> function.
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</p>
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</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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Since PHP 4.3.0, you will often get a slash or a dot back from
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<span class="function"><strong>dirname()</strong></span> in situations where the older
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functionality would have given you the empty string.
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</p>
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</p></blockquote>
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<p class="para">
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检查下面发生变化的例子：
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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 /><br /></span><span style="color: #FF8000">// PHP 4.3.0 以前<br /></span><span style="color: #0000BB">dirname</span><span style="color: #007700">(</span><span style="color: #DD0000">'c:/'</span><span style="color: #007700">); </span><span style="color: #FF8000">// 返回 '.'<br /><br />// PHP 4.3.0 以后<br /></span><span style="color: #0000BB">dirname</span><span style="color: #007700">(</span><span style="color: #DD0000">'c:/x'</span><span style="color: #007700">); </span><span style="color: #FF8000">// 返回 'c:'<br /></span><span style="color: #0000BB">dirname</span><span style="color: #007700">(</span><span style="color: #DD0000">'c:/Temp/x'</span><span style="color: #007700">); </span><span style="color: #FF8000">// 返回 'c:/Temp'<br /></span><span style="color: #0000BB">dirname</span><span style="color: #007700">(</span><span style="color: #DD0000">'/x'</span><span style="color: #007700">); </span><span style="color: #FF8000">// 返回 '\'<br /><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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</div>
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<div class="refsect1 seealso" id="refsect1-function.dirname-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="basename.html" class="function" rel="rdfs-seeAlso">basename()</a> - 返回路径中的文件名部分</span></li>
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<li class="member"><span class="function"><a href="pathinfo.html" class="function" rel="rdfs-seeAlso">pathinfo()</a> - 返回文件路径的信息</span></li>
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<li class="member"><span class="function"><a href="realpath.html" class="function" rel="rdfs-seeAlso">realpath()</a> - 返回规范化的绝对路径名</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> |