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pi

(PHP 3, PHP 4, PHP 5)

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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