<?xml version="1.0" encoding="iso-8859-1"?>
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  <refentry id="function.pi">
   <refnamediv>
    <refname>pi</refname>
    <refpurpose>Get value of pi</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>float</type><methodname>pi</methodname>
      <void/>
     </methodsynopsis>
    <simpara>
     Returns an approximation of pi.  The returned <type>float</type>
     has a precision based on the
     <link linkend="ini.precision">precision</link> directive in
     &php.ini;, which defaults to <literal>14</literal>.
     Also, you can use the <constant>M_PI</constant> constant which yields
     identical results to <function>pi</function>.
    </simpara>
    <para>
     <example>
      <title><function>pi</function> example</title>
      <programlisting role="php">
<![CDATA[
<?php
echo pi(); // 3.1415926535898
echo M_PI; // 3.1415926535898
?>
]]>
      </programlisting>
     </example>
    </para>
   </refsect1>
  </refentry>

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