pi

(PHP 4, PHP 5, PHP 7)

pi — Get value of pi

pi ( ) : float

Returns an approximation of pi. Also, you can use the M_PI constant which yields identical results to pi().

The value of pi as float.

Example #1 pi() example

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

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https://www.php.net/manual/en/function.pi.php