pi

(PHP 4, PHP 5, PHP 7)

Get value of pi

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().

Returns:

The value of pi as float.

Examples:

pi() example

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

Links:

http://php.net/manual/en/function.pi.php

doc_php

2016-02-24 16:02:31

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