(PHP 4, PHP 5, PHP 7, PHP 8)
pi — Get value of pi
Returns an approximation of pi.
Also, you can use the M_PI constant which yields
identical results to pi().
Bu işlevin bağımsız değişkeni yoktur.
The value of pi as float.
Örnek 1 pi() example
<?php
echo pi(); / 3.1415926535898
echo M_PI; / 3.1415926535898
?>