PHP pi() Function

❮ PHP Math Reference

Example

Return the value of PI:

<?php
echo(pi());
?>

Try it Yourself »

Definition and Usage

The pi() function returns the value of PI.

Tip: The named constant M_PI is identical to pi().

Syntax

pi();

Technical Details

Return Value:	3.1415926535898
Return Type:	Float
PHP Version:	4+

❮ PHP Math Reference

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