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57 lines
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HTML
57 lines
4.7 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>返回当前 Unix 时间戳和微秒数</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.microtime" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">microtime</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">microtime</span> — <span class="dc-title">返回当前 Unix 时间戳和微秒数</span></p>
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</div>
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<div class="refsect1 unknown-seealsp" id="refsect1-function.microtime-unknown-seealsp">
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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>microtime</strong></span>
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([ <span class="methodparam"><span class="type">bool</span> <code class="parameter">$get_as_float</code></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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<span class="function"><strong>microtime()</strong></span> 当前 Unix
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时间戳以及微秒数。本函数仅在支持 gettimeofday()
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系统调用的操作系统下可用。
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</p>
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<p class="para">
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如果调用时不带可选参数，本函数以 "msec sec"
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的格式返回一个字符串，其中 sec 是自 Unix 纪元（0:00:00 January 1,
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1970 GMT）起到现在的秒数，msec 是微秒部分。字符串的两部分都是以秒为单位返回的。
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</p>
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<p class="para">
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如果给出了 <code class="parameter">get_as_float</code> 参数并且其值等价于
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<strong><code>TRUE</code></strong>，<span class="function"><strong>microtime()</strong></span> 将返回一个浮点数。
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</p>
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<span class="simpara">
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<code class="parameter">get_as_float</code> 参数是 PHP 5.0.0 新加的。
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</span>
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</p></blockquote>
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<p class="para">
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<div class="example" id="example-2726">
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<p><strong>Example #1 用 <span class="function"><strong>microtime()</strong></span> 对脚本的运行计时</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">/**<br /> * Simple function to replicate PHP 5 behaviour<br /> */<br /></span><span style="color: #007700">function </span><span style="color: #0000BB">microtime_float</span><span style="color: #007700">()<br />{<br /> list(</span><span style="color: #0000BB">$usec</span><span style="color: #007700">, </span><span style="color: #0000BB">$sec</span><span style="color: #007700">) = </span><span style="color: #0000BB">explode</span><span style="color: #007700">(</span><span style="color: #DD0000">" "</span><span style="color: #007700">, </span><span style="color: #0000BB">microtime</span><span style="color: #007700">());<br /> return ((float)</span><span style="color: #0000BB">$usec </span><span style="color: #007700">+ (float)</span><span style="color: #0000BB">$sec</span><span style="color: #007700">);<br />}<br /><br /></span><span style="color: #0000BB">$time_start </span><span style="color: #007700">= </span><span style="color: #0000BB">microtime_float</span><span style="color: #007700">();<br /><br /></span><span style="color: #FF8000">// Sleep for a while<br /></span><span style="color: #0000BB">usleep</span><span style="color: #007700">(</span><span style="color: #0000BB">100</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$time_end </span><span style="color: #007700">= </span><span style="color: #0000BB">microtime_float</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">$time </span><span style="color: #007700">= </span><span style="color: #0000BB">$time_end </span><span style="color: #007700">- </span><span style="color: #0000BB">$time_start</span><span style="color: #007700">;<br /><br />echo </span><span style="color: #DD0000">"Did nothing in </span><span style="color: #0000BB">$time</span><span style="color: #DD0000"> seconds\n"</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>
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</p>
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<p class="para">
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参见 <span class="function"><a href="time.html" class="function">time()</a></span>。
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</p>
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</div>
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</div></div></div></body></html> |