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pi — Returns the value of pi.


float pi(void)


Value of pi


Returns a double containing the value of pi. The number of decimal places is system-specific; for instance, on a Linux x86 box the value returned is 3.1415926535898.

Note that it will be slightly faster in most cases to simply use the named constant M_PI, which is provided by PHP. The pi() function simply returns this value.


PHP 3, PHP 4


Example 686. Get pi

$radius = 6;
$area = pi() * pow($radius, 2); // area = pi * r^2
echo "Area of circle with radius $radius is $area";

PHP Functions Essential Reference. Copyright © 2002 by New Riders Publishing (Authors: Zak Greant, Graeme Merrall, Torben Wilson, Brett Michlitsch). This material may be distributed only subject to the terms and conditions set forth in the Open Publication License, v1.0 or later (the latest version is presently available at The authors of this book have elected not to choose any options under the OPL. This online book was obtained from and is designed to provide information about the PHP programming language, focusing on PHP version 4.0.4 for the most part. The information is provided on an as-is basis, and no warranty or fitness is implied. All persons and entities shall have neither liability nor responsibility to any person or entity with respect to any loss or damage arising from the information contained in this book.

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