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().
Example 1. pi() example
<?php
echo pi(); // 3.1415926535898
echo M_PI; // 3.1415926535898
?>
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