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Last updated: Sat, 27 Jan 2007

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# pi

(PHP 3, PHP 4, PHP 5)

pi -- Возвращает число Пи

## Описание

float pi ( void )

Возвращает число Пи с точностью, определяемой директивой precision в `php.ini`, значение по умолчанию которой `14`. Константа `M_PI` даёт идентичный результат.

Пример 1. Пример pi()

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

add a note User Contributed Notes
pi
Keamos at gmail
13-Jan-2006 09:31
`For anyone wondering, the highest precision you can get for pi() or M_PI is 20 places after the decimal point, or 3.14159265358979323846.`
davidduke at hotmail dot com
27-Mar-2004 06:18
`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)`
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pow octdec

Last updated: Sat, 27 Jan 2007
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