pi

Get value of pi

float pi()

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

This function has no parameters.

The value of pi as float.

Example #1 pi example

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