pi.xml

<?xml version="1.0" encoding="utf-8"?>
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<refentry xml:id="function.pi" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>pi</refname>
  <refpurpose>Liefert den Wert von Pi</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>float</type><methodname>pi</methodname>
   <void/>
  </methodsynopsis>
  <simpara>
   Die Funktion gibt einen Näherungswert von Pi zurück. Sie können auch die
   Konstante <constant>M_PI</constant> verwenden, die das gleiche Resultat
   liefert wie <function>pi</function>.
  </simpara>
 </refsect1>
 
 <refsect1 role="parameters">
  &reftitle.parameters;
  &no.function.parameters;
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Der Wert von Pi als <type>float</type>.
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>pi</function>-Beispiel</title>
    <programlisting role="php">
<![CDATA[
<?php
echo pi(); // 3.1415926535898
echo M_PI; // 3.1415926535898
?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>

</refentry>
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