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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.9 $ -->
<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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sgml-parent-document:nil
sgml-default-dtd-file:"../../../../manual.ced"
sgml-exposed-tags:nil
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vim: et tw=78 syn=sgml
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-->
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