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158 lines
6.6 KiB
HTML
158 lines
6.6 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>设定文件的访问和修改时间</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.touch" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">touch</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">touch</span> — <span class="dc-title">设定文件的访问和修改时间</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.touch-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>touch</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$filename</code></span>
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[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$time</code><span class="initializer"> = time()</span></span>
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[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$atime</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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尝试将由 <code class="parameter">filename</code>
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给出的文件的访问和修改时间设定为给出的 <code class="parameter">time</code>。
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注意访问时间总是会被修改的，不论有几个参数。
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</p>
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<p class="para">
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如果文件不存在，则会被创建。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.touch-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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要设定的文件名。
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</p>
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</dd>
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<dt>
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<code class="parameter">time</code></dt>
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<dd>
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<p class="para">
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要设定的时间。如果没有提供参数 <code class="parameter">time</code> 则会使用当前系统的时间。
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</p>
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</dd>
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<dt>
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<code class="parameter">atime</code></dt>
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<dd>
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<p class="para">
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如果给出了这个参数，则给定文件的访问时间会被设为
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<code class="parameter">atime</code>，否则会设置 为<code class="parameter">time</code>。如果没有给出这两个参数，则使用当前系统时间。
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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.touch-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 changelog" id="refsect1-function.touch-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>5.3.0</td>
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<td>
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能够修改 Windows 下目录的最后修改时间。
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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.touch-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-2849">
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<p><strong>Example #1 <span class="function"><strong>touch()</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">if (</span><span style="color: #0000BB">touch</span><span style="color: #007700">(</span><span style="color: #0000BB">$filename</span><span style="color: #007700">)) {<br /> echo </span><span style="color: #0000BB">$filename </span><span style="color: #007700">. </span><span style="color: #DD0000">' modification time has been changed to present time'</span><span style="color: #007700">;<br />} else {<br /> echo </span><span style="color: #DD0000">'Sorry, could not change modification time of ' </span><span style="color: #007700">. </span><span style="color: #0000BB">$filename</span><span style="color: #007700">;<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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<p class="para">
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<div class="example" id="example-2850">
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<p><strong>Example #2 使用 <code class="parameter">time</code> 参数的 <span class="function"><strong>touch()</strong></span></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: #FF8000">// This is the touch time, we'll set it to one hour in the past.<br /></span><span style="color: #0000BB">$time </span><span style="color: #007700">= </span><span style="color: #0000BB">time</span><span style="color: #007700">() - </span><span style="color: #0000BB">3600</span><span style="color: #007700">;<br /><br /></span><span style="color: #FF8000">// Touch the file<br /></span><span style="color: #007700">if (!</span><span style="color: #0000BB">touch</span><span style="color: #007700">(</span><span style="color: #DD0000">'some_file.txt'</span><span style="color: #007700">, </span><span style="color: #0000BB">$time</span><span style="color: #007700">)) {<br /> echo </span><span style="color: #DD0000">'Whoops, something went wrong...'</span><span style="color: #007700">;<br />} else {<br /> echo </span><span style="color: #DD0000">'Touched file with success'</span><span style="color: #007700">;<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 notes" id="refsect1-function.touch-notes">
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<h3 class="title">注释</h3>
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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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<div class="warning"><strong class="warning">Warning</strong>
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<p class="para">
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在 PHP 5.3.0 之前无法修改 Windows 下目录的最后修改时间。
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</p>
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</div>
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</div>
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</div></div></div></body></html> |