Please wait while we load your page...


PHP Manual :: pi

octdec || pow || Math Functions || PHP Manual

(PHP 4, PHP 5, PHP 7)

piGet 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().

Return Values

The value of pi as float.


Example #1 pi() example

echo pi(); // 3.1415926535898
echo M_PI// 3.1415926535898

octdec || pow || Math Functions || PHP Manual
Live Chat Not Available