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119 lines
5.5 KiB
HTML
119 lines
5.5 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>返回一个 Directory 类实例</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.dir" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">dir</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">dir</span> — <span class="dc-title">返回一个 Directory 类实例</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.dir-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>dir</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$directory</code></span>
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[, <span class="methodparam"><span class="type">resource</span> <code class="parameter">$context</code></span>
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] ) : <span class="type"><a href="class.directory.html" class="type Directory">Directory</a></span></div>
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<p class="para rdfs-comment">
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以面向对象的方式访问目录。打开
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<code class="parameter">directory</code> 参数指定的目录。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.dir-parameters">
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<h3 class="title">参数</h3>
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<dl>
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<dt>
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<code class="parameter">directory</code></dt>
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<dd>
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<p class="para">
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被打开的目录
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</p>
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</dd>
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<dt>
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<code class="parameter">context</code></dt>
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<dd>
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<p class="para">
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<blockquote class="note"><p><strong class="note">Note</strong>: <span class="simpara">在 PHP 5.0.0
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中增加了对上下文（Context）的支持。有关<em>上下文（Context）</em>的说明参见
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<a href="book.stream.html" class="xref">Streams</a>。</span></p></blockquote>
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</p>
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</dd>
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</dl>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.dir-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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成功的话，返回一个 <a href="class.directory.html" class="classname">Directory</a> 类实例, 参数错误的情况下返回 <strong><code>NULL</code></strong> ，
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其它错误情况返回 <strong><code>FALSE</code></strong> 。
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.dir-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-2749">
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<p><strong>Example #1 <span class="function"><strong>dir()</strong></span> 示例</strong></p>
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<div class="example-contents"><p>
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请特别注意下面示例中 <span class="function"><a href="directory.read.html" class="function">Directory::read()</a></span> 函数返回值的判断方式。
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我们严格测试（值相等，并且类型相同，请参考 <a href="language.operators.comparison.html" class="link">
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比较运算符</a> ）返回值等于 <strong><code>FALSE</code></strong> ，因为有些情况下，目录名可能"等于" <strong><code>FALSE</code></strong> ，导致
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跳出循环。
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</p></div>
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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 />$d </span><span style="color: #007700">= </span><span style="color: #0000BB">dir</span><span style="color: #007700">(</span><span style="color: #DD0000">"/etc/php5"</span><span style="color: #007700">);<br />echo </span><span style="color: #DD0000">"Handle: " </span><span style="color: #007700">. </span><span style="color: #0000BB">$d</span><span style="color: #007700">-></span><span style="color: #0000BB">handle </span><span style="color: #007700">. </span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />echo </span><span style="color: #DD0000">"Path: " </span><span style="color: #007700">. </span><span style="color: #0000BB">$d</span><span style="color: #007700">-></span><span style="color: #0000BB">path </span><span style="color: #007700">. </span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />while (</span><span style="color: #0000BB">false </span><span style="color: #007700">!== (</span><span style="color: #0000BB">$entry </span><span style="color: #007700">= </span><span style="color: #0000BB">$d</span><span style="color: #007700">-></span><span style="color: #0000BB">read</span><span style="color: #007700">())) {<br /> echo </span><span style="color: #0000BB">$entry</span><span style="color: #007700">.</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />}<br /></span><span style="color: #0000BB">$d</span><span style="color: #007700">-></span><span style="color: #0000BB">close</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>以上例程的输出类似于：</p></div>
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<div class="example-contents screen">
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<div class="cdata"><pre>
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Handle: Resource id #2
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Path: /etc/php5
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.
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..
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apache
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cgi
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cli
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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.dir-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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目录条目返回的顺序依赖于系统。
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</p>
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</p></blockquote>
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</div>
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</div></div></div></body></html> |