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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<title>得到圆周率值</title>
</head>
<body class="docs"><div id="layout">
<div id="layout-content"><div id="function.pi" class="refentry">
<div class="refnamediv">
<h1 class="refname">pi</h1>
<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">pi</span> &mdash; <span class="dc-title">得到圆周率值</span></p>
</div>
<div class="refsect1 description" id="refsect1-function.pi-description">
<h3 class="title">说明</h3>
<div class="methodsynopsis dc-description">
<span class="methodname"><strong>pi</strong></span>
( <span class="methodparam">void</span>
) : <span class="type">float</span></div>
<p class="simpara">
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>
精度是由 <var class="filename">php.ini</var> 中的 <a href="ini.core.html#ini.precision" class="link">precision</a>
指令确定。默认值是 <em>14</em>。你也可以使用
<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。
</p>
</div>
<div class="refsect1 returnvalues" id="refsect1-function.pi-returnvalues">
<h3 class="title">返回值</h3>
<p class="para">
圆周率（pi）的浮点近似值。
</p>
</div>
<div class="refsect1 examples" id="refsect1-function.pi-examples">
<h3 class="title">范例</h3>
<p class="para">
<div class="example" id="example-4138">
<p><strong>Example #1 <span class="function"><strong>pi()</strong></span> 例子</strong></p>
<div class="example-contents">
<div class="phpcode"><pre><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /></span><span style="color: #007700">echo&nbsp;</span><span style="color: #0000BB">pi</span><span style="color: #007700">();&nbsp;</span><span style="color: #FF8000">//&nbsp;3.1415926535898<br /></span><span style="color: #007700">echo&nbsp;</span><span style="color: #0000BB">M_PI</span><span style="color: #007700">;&nbsp;</span><span style="color: #FF8000">//&nbsp;3.1415926535898<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</pre></div>
</div>
</div>
</p>
</div>
</div></div></div></body></html>