<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.1 $ -->
<section id="math.constants">
 &reftitle.constants;
 &extension.constants.core;
 <para>
  <table>
   <title>Math constants</title>
   <tgroup cols="3">
    <thead>
     <row>
      <entry>Constant</entry>
      <entry>Value</entry>
      <entry>Description</entry>
     </row>
    </thead>
    <tbody>
     <row>
      <entry>M_PI</entry>
      <entry>3.14159265358979323846</entry>
      <entry>Pi</entry>
     </row>
     <row>
      <entry>M_E</entry>
      <entry>2.7182818284590452354</entry>
      <entry>e</entry>
     </row>
     <row>
      <entry>M_LOG2E</entry> 
      <entry>1.4426950408889634074</entry>
      <entry>log_2 e</entry>
     </row>
     <row>
      <entry>M_LOG10E</entry>
      <entry>0.43429448190325182765</entry>
      <entry>log_10 e</entry>
     </row>
     <row>
      <entry>M_LN2</entry>   
      <entry>0.69314718055994530942</entry>
      <entry>log_e 2</entry>
     </row>
     <row>
      <entry>M_LN10</entry>  
      <entry>2.30258509299404568402</entry>
      <entry>log_e 10</entry>
     </row>
     <row>
      <entry>M_PI_2</entry>
      <entry>1.57079632679489661923</entry>
      <entry>pi/2</entry>
     </row>
     <row>
      <entry>M_PI_4</entry>
     <entry>0.78539816339744830962</entry>
      <entry>pi/4</entry>
     </row>
     <row>
      <entry>M_1_PI</entry>
      <entry>0.31830988618379067154</entry>
      <entry>1/pi</entry>
     </row>
     <row>
      <entry>M_2_PI</entry>
      <entry>0.63661977236758134308</entry>
      <entry>2/pi</entry>
     </row>
     <row>
      <entry>M_SQRTPI</entry>    
      <entry>1.77245385090551602729</entry>
      <entry>sqrt(pi) [4.0.2]</entry>
     </row>
     <row>
      <entry>M_2_SQRTPI</entry>  
      <entry>1.12837916709551257390</entry>
      <entry>2/sqrt(pi)</entry>
     </row>
     <row>
      <entry>M_SQRT2</entry> 
      <entry>1.41421356237309504880</entry>
      <entry>sqrt(2)</entry>
     </row>
     <row>
      <entry>M_SQRT3</entry> 
      <entry>1.73205080756887729352</entry>
      <entry>sqrt(3) [4.0.2]</entry>
     </row>
     <row>
      <entry>M_SQRT1_2</entry>   
      <entry>0.70710678118654752440</entry>
      <entry>1/sqrt(2)</entry>
     </row>
     <row>
      <entry>M_LNPI</entry>  
      <entry>1.14472988584940017414</entry>
      <entry>log_e(pi) [4.0.2]</entry>
     </row>
     <row>
      <entry>M_EULER</entry> 
      <entry>0.57721566490153286061</entry>
      <entry>Euler constant [4.0.2]</entry>
     </row>
    </tbody>
   </tgroup>
  </table>
  Only M_PI is available in PHP versions up to and including PHP 4.0.0.
  All other constants are available starting with PHP 4.0.0. Constants
  labeled [4.0.2] were added in PHP 4.0.2.
 </para>
</section>

<!-- Keep this comment at the end of the file
Local variables:
mode: sgml
sgml-omittag:t
sgml-shorttag:t
sgml-minimize-attributes:nil
sgml-always-quote-attributes:t
sgml-indent-step:1
sgml-indent-data:t
indent-tabs-mode:nil
sgml-parent-document:nil
sgml-default-dtd-file:"../../../manual.ced"
sgml-exposed-tags:nil
sgml-local-catalogs:nil
sgml-local-ecat-files:nil
End:
vim600: syn=xml fen fdm=syntax fdl=2 si
vim: et tw=78 syn=sgml
vi: ts=1 sw=1
-->