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115 lines
5.7 KiB
HTML
115 lines
5.7 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>取得文件的上次访问时间</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.fileatime" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">fileatime</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">fileatime</span> — <span class="dc-title">取得文件的上次访问时间</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.fileatime-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>fileatime</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="simpara">
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取得文件的上次访问时间。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.fileatime-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.fileatime-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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返回文件上次被访问的时间， 或者在失败时返回 <strong><code>FALSE</code></strong>。时间以 Unix 时间戳的方式返回。
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.fileatime-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-2785">
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<p><strong>Example #1 <span class="function"><strong>fileatime()</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 /><br /></span><span style="color: #FF8000">// 输出类似：somefile.txt was last accessed: December 29 2002 22:16:23.<br /><br /></span><span style="color: #0000BB">$filename </span><span style="color: #007700">= </span><span style="color: #DD0000">'somefile.txt'</span><span style="color: #007700">;<br />if (</span><span style="color: #0000BB">file_exists</span><span style="color: #007700">(</span><span style="color: #0000BB">$filename</span><span style="color: #007700">)) {<br /> echo </span><span style="color: #DD0000">"</span><span style="color: #0000BB">$filename</span><span style="color: #DD0000"> was last accessed: " </span><span style="color: #007700">. </span><span style="color: #0000BB">date</span><span style="color: #007700">(</span><span style="color: #DD0000">"F d Y H:i:s."</span><span style="color: #007700">, </span><span style="color: #0000BB">fileatime</span><span style="color: #007700">(</span><span style="color: #0000BB">$filename</span><span style="color: #007700">));<br />}<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 errors" id="refsect1-function.fileatime-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.fileatime-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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注意：一个文件的 atime
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应该在不论何时读取了此文件中的数据块时被更改。当一个应用程序定期访问大量文件或目录时很影响性能。
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</p>
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<p class="para">
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有些
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Unix 文件系统可以在加载时关闭 atime 的更新以提高这类程序的性能。USENET
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新闻组假脱机是一个常见的例子。在这种文件系统下本函数没有用处。
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</p>
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</p></blockquote>
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<blockquote class="note"><p><strong class="note">Note</strong>: <p class="para">注意：不同文件系统对时间的判断方法可能是不相同的。</p></p></blockquote>
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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.fileatime-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="filemtime.html" class="function" rel="rdfs-seeAlso">filemtime()</a> - 取得文件修改时间</span></li>
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<li class="member"><span class="function"><a href="fileinode.html" class="function" rel="rdfs-seeAlso">fileinode()</a> - 取得文件的 inode</span></li>
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<li class="member"><span class="function"><a href="date.html" class="function" rel="rdfs-seeAlso">date()</a> - 格式化一个本地时间／日期</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> |