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PHP : Function Reference : Mathematical Functions : pi

pi

Get value of pi (PHP 4, PHP 5)
float pi ( )

Example 1155. pi() example

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

Related Examples ( Source code ) » pi
















Code Examples / Notes » pi

davidduke

Pi is often usefull in con/sin/tan functions..
There are also other Pi related constants.
These are most of them:
M_PI  = 3.14159265358979323846 // pi
// The following were added in PHP 4.0.0
M_PI_2 = 1.57079632679489661923 // pi/2
M_PI_4 = 0.78539816339744830962 // pi/4
M_1_PI = 0.31830988618379067154 // 1/pi
M_2_PI = 0.63661977236758134308 // 2/pi
M_SQRTPI = 1.77245385090551602729 // sqrt(pi) (Only in PHP 4.0.2+)
M_2_SQRTPI = 1.12837916709551257390 // 2/sqrt(pi)


keamos

For anyone wondering, the highest precision you can get for pi() or M_PI is 20 places after the decimal point, or 3.14159265358979323846.

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