piDescriptionReturns 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 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
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The authors of this book have elected not to choose any options under the OPL. This online book was obtained
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and is designed to provide information about the PHP programming language, focusing on PHP version 4.0.4
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