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145 lines
4.5 KiB
HTML
145 lines
4.5 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>取得当前时间</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.gettimeofday" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">gettimeofday</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">gettimeofday</span> — <span class="dc-title">取得当前时间</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.gettimeofday-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>gettimeofday</strong></span>
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([ <span class="methodparam"><span class="type">bool</span> <code class="parameter">$return_float</code><span class="initializer"> = false</span></span>
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] ) : <span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span></div>
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<p class="para rdfs-comment">
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本函数是 gettimeofday(2) 的接口。返回一个关联数组，包含有系统调用返回的数据。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.gettimeofday-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">return_float</code></dt>
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<dd>
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<p class="para">
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当其设为
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<strong><code>TRUE</code></strong> 时，会返回一个浮点数而不是一个数组。
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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.gettimeofday-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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默认返回一个 <span class="type"><a href="language.types.array.html" class="type array">array</a></span>。如果 <code class="parameter">return_float</code>
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设置了则会返回一个 <span class="type"><a href="language.types.float.html" class="type float">float</a></span>。
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</p>
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<p class="para">
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数组中的键为：
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<ul class="itemizedlist">
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<li class="listitem">
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<span class="simpara">
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"sec" - 自 Unix 纪元起的秒数
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</span>
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</li>
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<li class="listitem">
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<span class="simpara">
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"usec" - 微秒数
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</span>
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</li>
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<li class="listitem">
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<span class="simpara">
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"minuteswest" - 格林威治向西的分钟数
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</span>
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</li>
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<li class="listitem">
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<span class="simpara">
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"dsttime" - 夏令时修正的类型
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</span>
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</li>
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</ul>
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</p>
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</div>
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<div class="refsect1 changelog" id="refsect1-function.gettimeofday-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>5.1.0</td>
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<td>
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增加了参数 <code class="parameter">return_float</code>。
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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.gettimeofday-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-2721">
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<p><strong>Example #1 <span class="function"><strong>gettimeofday()</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 />print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">gettimeofday</span><span style="color: #007700">());<br /><br />echo </span><span style="color: #0000BB">gettimeofday</span><span style="color: #007700">(</span><span style="color: #0000BB">true</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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Array
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(
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[sec] => 1073504408
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[usec] => 238215
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[minuteswest] => 0
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[dsttime] => 1
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)
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1073504408.23910
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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></div></div></body></html> |