W3Schools.com

HOME HTML CSS XML JAVASCRIPT ASP PHP SQL MORE...

REFERENCES | EXAMPLES | FORUM | ABOUT

PHP Basic

PHP HOME
PHP Intro
PHP Install
PHP Syntax
PHP Variables
PHP String
PHP Operators
PHP If...Else
PHP Switch
PHP Arrays
PHP While Loops
PHP For Loops
PHP Functions
PHP Forms
PHP $_GET
PHP $_POST

PHP Advanced

PHP Date
PHP Include
PHP File
PHP File Upload
PHP Cookies
PHP Sessions
PHP E-mail
PHP Secure E-mail
PHP Error
PHP Exception
PHP Filter

PHP Database

MySQL Introduction
MySQL Connect
MySQL Create
MySQL Insert
MySQL Select
MySQL Where
MySQL Order By
MySQL Update
MySQL Delete
PHP ODBC

PHP XML

XML Expat Parser
XML DOM
XML SimpleXML

PHP and AJAX

AJAX Intro
AJAX PHP
AJAX Database
AJAX XML
AJAX Live Search
AJAX RSS Reader
AJAX Poll

PHP Reference

PHP Array
PHP Calendar
PHP Date
PHP Directory
PHP Error
PHP Filesystem
PHP Filter
PHP FTP
PHP HTTP
PHP Libxml
PHP Mail
PHP Math
PHP Misc
PHP MySQL
PHP SimpleXML
PHP String
PHP XML
PHP Zip

PHP Quiz

PHP Quiz
PHP Certificate

PHP pi() Function

PHP Math Reference

Complete PHP Math Reference

Definition and Usage

The pi() function returns the value of PI.

Syntax

pi()

Tips and Notes

Tip: The named constant M_PI, yields identical results to pi().

Example

<?php
echo pi();
?>

The output of the code above will be:

3.14159265359

PHP Math Reference

Complete PHP Math Reference

WEB HOSTING
Best Web Hosting
PHP MySQL Hosting
Best Hosting Coupons
UK Reseller Hosting
Cloud Hosting
Top Web Hosting
$3.98 Unlimited Hosting
Premium Website Design

WEB BUILDING
Download XML Editor
FREE Website BUILDER
Best Website Templates Top CSS Templates
CREATE HTML Websites
EASY WEBSITE BUILDER

W3SCHOOLS EXAMS
Get Certified in: HTML, CSS, JavaScript, XML, PHP, and ASP

W3SCHOOLS BOOKS
New Books: HTML, CSS JavaScript, and Ajax

STATISTICS
Browser Statistics Browser OS Browser Display

SHARE THIS PAGE
Share with »