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52 lines
2.5 KiB
HTML
52 lines
2.5 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>得到圆周率值</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.pi" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">pi</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">pi</span> — <span class="dc-title">得到圆周率值</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.pi-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>pi</strong></span>
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( <span class="methodparam">void</span>
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) : <span class="type">float</span></div>
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<p class="simpara">
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返回圆周率的近似值。返回值的 <span class="type"><a href="language.types.float.html" class="type float">float</a></span>
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精度是由 <var class="filename">php.ini</var> 中的 <a href="ini.core.html#ini.precision" class="link">precision</a>
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指令确定。默认值是 <em>14</em>。你也可以使用
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<strong><code>M_PI</code></strong> 常量，该常量产生与 <span class="function"><strong>pi()</strong></span> 完全相同的结果。
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</p>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.pi-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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圆周率（pi）的浮点近似值。
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.pi-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-4138">
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<p><strong>Example #1 <span class="function"><strong>pi()</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">echo </span><span style="color: #0000BB">pi</span><span style="color: #007700">(); </span><span style="color: #FF8000">// 3.1415926535898<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">M_PI</span><span style="color: #007700">; </span><span style="color: #FF8000">// 3.1415926535898<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></div></div></body></html> |