php-doc-en/reference/math/functions/pi.xml

<?xml version="1.0" encoding="iso-8859-1"?>
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<refentry xml:id="function.pi" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>pi</refname>
  <refpurpose>Get value of pi</refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
   <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>
 </refsect1>
 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   The value of pi as float.
  </para>
 </refsect1>
 <refsect1 role="examples">
  &reftitle.examples;
  <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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