   #PHP Manual Mathematical Functions octdec pow

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                                      pi

   (PHP 3, PHP 4 )
   pi -- Get value of pi

Description

   float pi ( void )

   Returns an approximation of pi. The returned float has a precision
   based on the precision directive in php.ini, which defaults to 14.
   Also, you can use the M_PI constant which yields identical results to
   pi().

   <?php
   echo pi(); // 3.1415926535898
   echo M_PI; // 3.1415926535898
   ?>
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